You searched for subject:(motion compensation).
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Luleå University of Technology
1.
Helander, Johan.
Motion compensated deinterlacer : analysis and implementation.
Degree: 2008, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44499 
► In the early days of television as Cathode Ray Tube (CRT) screens became brighter, the level of flicker caused by progressive scanning became more…
(more)
▼ In the early days of television as Cathode Ray Tube (CRT) screens became brighter, the level of flicker caused by progressive scanning became more noticeable. This is because the human visual system is sensitive to large-area flicker. Interlaced scanning was invented in 1932 as a redeem to this difficulty. In contrast to progressive scanning, where every line is drawn in sequence, interlaced scanning alternates lines of a frame in half a frame interval, called a field. The conversion process from interlace scan to progressive scan is called deinterlacing. In this thesis, two deinterlacing methods, which use motion information from the video sequence, were used in conjunction to obtain an improved result. Thus, the process of finding the true motion on the interlaced video sequence also had to be analyzed. The analysis was done on artificially generated test sequences, as well as true video sequences. The result was measured using the Mean Square Error between a progressive input sequence and the deinterlaced output sequence. This measurement was compared to a much simpler deinterlacing algorithm and showed large improvements, primarily in sense of aliasing. However, in some cases, the deinterlacer produced severe artifacts causing picture degradation.
Validerat; 20101217 (root)
Subjects/Keywords: Technology; Signalbehandling; Videoteknik; Deinterlacer; Motion; compensation; Teknik
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APA (6th Edition):
Helander, J. (2008). Motion compensated deinterlacer : analysis and implementation. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44499
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Helander, Johan. “Motion compensated deinterlacer : analysis and implementation.” 2008. Thesis, Luleå University of Technology. Accessed December 05, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44499.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Helander, Johan. “Motion compensated deinterlacer : analysis and implementation.” 2008. Web. 05 Dec 2019.
Vancouver:
Helander J. Motion compensated deinterlacer : analysis and implementation. [Internet] [Thesis]. Luleå University of Technology; 2008. [cited 2019 Dec 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44499.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Helander J. Motion compensated deinterlacer : analysis and implementation. [Thesis]. Luleå University of Technology; 2008. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-44499
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Bath
2.
Pengpan, Thanyawee.
A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.
Degree: PhD, 2012, University of Bath
URL: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873
► Cone-beam computed tomography (CBCT) is an imaging technique used in conjunction with radiation therapy. CBCT is used to verify the position of tumours just prior…
(more)
▼ Cone-beam computed tomography (CBCT) is an imaging technique used in conjunction with radiation therapy. CBCT is used to verify the position of tumours just prior to radiation treatment session. The accuracy of the radiation treatment of thoracic and upper abdominal tumours is heavily affected by respiratory movement. Blurring artefacts, due to the movement during a CBCT scanning, cause misregistration between the CBCT image and the planning image. There has been growing interest in the use of motion-compensated CBCT for correcting the breathing-induced artefacts. A wide range of iterative reconstruction methods have been developed for CBCT imaging. The direct motion compensation technique has been applied to algebraic reconstruction technique (ART), simultaneous ART (SART), ordered-subset SART (OS-SART) and conjugate gradient least squares (CGLS). In this thesis a dual modality imaging of electrical impedance tomography (EIT) and CBCT is proposed for the first time. This novel dual modality imaging uses the advantages of high temporal resolution of EIT imaging and high spatial resolution of the CBCT method. The main objective of this study is to combine CBCT with EIT imaging system for motion-compensated CBCT using experimental and computational phantoms. The EIT images were used for extracting motion for a motion-compensated CBCT imaging system. A simple motion extraction technique is used for extracting motion data from the low spatial resolution EIT images. This motion data is suitable for input into the direct motion-compensated CBCT. The performance of iterative algorithms for motion compensation was also studied. The dual modality CBCT-EIT is verified using experimental EIT system and computational CBCT phantom data.
Subjects/Keywords: 616.0757; cone beam CT; Motion compensation; EIT
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APA (6th Edition):
Pengpan, T. (2012). A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873
Chicago Manual of Style (16th Edition):
Pengpan, Thanyawee. “A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.” 2012. Doctoral Dissertation, University of Bath. Accessed December 05, 2019.
https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873.
MLA Handbook (7th Edition):
Pengpan, Thanyawee. “A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography.” 2012. Web. 05 Dec 2019.
Vancouver:
Pengpan T. A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. [Internet] [Doctoral dissertation]. University of Bath; 2012. [cited 2019 Dec 05].
Available from: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873.
Council of Science Editors:
Pengpan T. A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography. [Doctoral Dissertation]. University of Bath; 2012. Available from: https://researchportal.bath.ac.uk/en/studentthesis/a-combination-of-motioncompensated-conebeam-computed-tomography-iame-reconstruction-and-electrical-impedance-tomography(6d6dd8c4-a76e-45d6-bbf0-02b24d5d157a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873
University of Georgia
3.
Patwardhan, Tapan.
Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations.
Degree: MS, Computer Science, 2010, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/patwardhan_tapan_201008_ms
► An important application of aerial video surveillance pertains to assistance in emergency rescue operations, where regions struck by natural calamities such as earthquakes, floods, and…
(more)
▼ An important application of aerial video surveillance pertains to assistance in emergency rescue operations, where regions struck by natural calamities such as earthquakes, floods, and tsunami can be monitored to detect activity of living beings. A low cost, easily deployable framework of multiple surveillance cameras is desired to perform such aerial surveillance. Many approaches exist for performing aerial video surveillance; one such approach is using helium balloons. In our system we use helium balloons to make the camera air borne, which reduces the system’s cost and deployment efforts. Suspending a camera from helium balloon causes jitters, which makes the task of
motion detection challenging. Creating a background model to detect ground activity from a moving camera requires camera
motion to be computed and compensated. Bandwidth congestion is another important issue to be considered in an aerial video surveillance system. We present a study of our low cost, scalable, and easily deployable framework of multiple aerial surveillance cameras to detect ground activity in emergency situations.
Advisors/Committee Members: Kang Li.
Subjects/Keywords: Aerial Surveillance; Motion Detection; Emergency Situations; Motion compensation
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APA (6th Edition):
Patwardhan, T. (2010). Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/patwardhan_tapan_201008_ms
Chicago Manual of Style (16th Edition):
Patwardhan, Tapan. “Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations.” 2010. Masters Thesis, University of Georgia. Accessed December 05, 2019.
http://purl.galileo.usg.edu/uga_etd/patwardhan_tapan_201008_ms.
MLA Handbook (7th Edition):
Patwardhan, Tapan. “Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations.” 2010. Web. 05 Dec 2019.
Vancouver:
Patwardhan T. Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations. [Internet] [Masters thesis]. University of Georgia; 2010. [cited 2019 Dec 05].
Available from: http://purl.galileo.usg.edu/uga_etd/patwardhan_tapan_201008_ms.
Council of Science Editors:
Patwardhan T. Aerial viewer: a cost effective framework for air-based video surveillance of emergency situations. [Masters Thesis]. University of Georgia; 2010. Available from: http://purl.galileo.usg.edu/uga_etd/patwardhan_tapan_201008_ms
Delft University of Technology
4.
Rao, S.
Concept Design and Analysis of TWD Motion Compensated Pile Gripper:.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1cdeac2d-bdb2-437f-8337-7b71dbffec61
► Nowadays, as it is a easy sequence in construction and installation, the monopile is the most common used support structure. Due to the limitation of…
(more)
▼ Nowadays, as it is a easy sequence in construction and installation, the monopile is the most common used support structure. Due to the limitation of water depth and lifting capacity, jack-up vessels gradually become unable to fulfill the demands of monopile installation. Floating vessels can expand the market of wind farminstallation due to the larger lifting capacity and higher cost-effectiveness. However, the main difficulty is that vessel motions will result in excessive monopile response, which is not conducive to monopile installation. To overcome this difficulty, TWD introduced the concept of the
Motion Compensated Pile Gripper, which aims to restrict monopile motions in order to allow it to be installed through a floating vessel.
Advisors/Committee Members: Metrikine, A.V..
Subjects/Keywords: motion compensation; dynamic behaviour; motion analysis; model coupling
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APA (6th Edition):
Rao, S. (2016). Concept Design and Analysis of TWD Motion Compensated Pile Gripper:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1cdeac2d-bdb2-437f-8337-7b71dbffec61
Chicago Manual of Style (16th Edition):
Rao, S. “Concept Design and Analysis of TWD Motion Compensated Pile Gripper:.” 2016. Masters Thesis, Delft University of Technology. Accessed December 05, 2019.
http://resolver.tudelft.nl/uuid:1cdeac2d-bdb2-437f-8337-7b71dbffec61.
MLA Handbook (7th Edition):
Rao, S. “Concept Design and Analysis of TWD Motion Compensated Pile Gripper:.” 2016. Web. 05 Dec 2019.
Vancouver:
Rao S. Concept Design and Analysis of TWD Motion Compensated Pile Gripper:. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2019 Dec 05].
Available from: http://resolver.tudelft.nl/uuid:1cdeac2d-bdb2-437f-8337-7b71dbffec61.
Council of Science Editors:
Rao S. Concept Design and Analysis of TWD Motion Compensated Pile Gripper:. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:1cdeac2d-bdb2-437f-8337-7b71dbffec61
Université Montpellier II
5.
Lopes da Frota Moreira, Pedro.
Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques.
Degree: Docteur es, SYAM - Systèmes Automatiques et Microélectroniques, 2012, Université Montpellier II
URL: http://www.theses.fr/2012MON20179
► L'introduction de systèmes robotisés dans les salles opératoires a fait évoluer la chirurgie moderne, ouvrant aux chirurgiens de nouvelles possibilités. La présence de tels systèmes…
(more)
▼ L'introduction de systèmes robotisés dans les salles opératoires a fait évoluer la chirurgie moderne, ouvrant aux chirurgiens de nouvelles possibilités. La présence de tels systèmes en salle opératoire croît chaque année. Les progrès des robots médicaux sont étroitement liés au développement de nouvelles techniques permettant de mieux contrôler les interactions entre la machine et les tissus biologiques. L'objectif principal de cette thèse est de proposer une commande en force basée sur un modèle, conçue pour améliorer la stabilité et la robustesse du contrôle en vue d'applications médicales. Une étude sur la modélisation des tissus mous ainsi que le choix d'un modèle compatible temps-réel sont présentés. Après cette analyse, le modèle de Kelvin Boltzmann a été choisi et implémenté dans le schéma de contrôle en force proposé, basé sur des observateurs actifs. La stabilité et la robustesse de la commande sont analysées en théorie et au travers d'expérimentations. Les performances de la commande en force sont également mesurées, en tenant compte des perturbations dues aux mouvements physiologiques. Finalement, afin d'améliorer la qualité du rejet des perturbations, une boucle de commande supplémentaire est ajoutée au moyen d'une estimation des perturbations basée sur le modèle de Kelvin Boltzmann et des séries de Fourier.
The introduction of robotic systems inside the operating room has changed the modern surgery, opening new possibilities to surgeons. The number of robotic systems inside the operation room is increasing every year. The progress of medical robots are associated to the development of new techniques to better control the interaction between the robot and living soft tissues. This thesis focus on the development of a model based force control designed to improve stability and robustness of force control addressed to medical applications. A study of soft tissue modeling is presented and a suitable model to be used in a real-time control is selected. After the analysis, the Kelvin Boltzmann model was chosen to be inserted in the proposed force control scheme based on Active Observers. Stability and robustness are theoretically and experimentally analyzed. The performance of the proposed force control is also investigated under physiological motion disturbances. At the end, to improve the disturbance rejection capability, an extra control loop is added using a disturbance estimation based on the Kelvin Boltzmann model and a Fourier series.
Advisors/Committee Members: Poignet, Philippe (thesis director), Zemiti, Nabil (thesis director).
Subjects/Keywords: Asservissement en effort; Robotique médicale; Compensation de mouvements physiologiques; Force Control; Medical Robotics; Motion Compensation
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APA (6th Edition):
Lopes da Frota Moreira, P. (2012). Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2012MON20179
Chicago Manual of Style (16th Edition):
Lopes da Frota Moreira, Pedro. “Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques.” 2012. Doctoral Dissertation, Université Montpellier II. Accessed December 05, 2019.
http://www.theses.fr/2012MON20179.
MLA Handbook (7th Edition):
Lopes da Frota Moreira, Pedro. “Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques.” 2012. Web. 05 Dec 2019.
Vancouver:
Lopes da Frota Moreira P. Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques. [Internet] [Doctoral dissertation]. Université Montpellier II; 2012. [cited 2019 Dec 05].
Available from: http://www.theses.fr/2012MON20179.
Council of Science Editors:
Lopes da Frota Moreira P. Model based force control for soft tissue interaction and applications in physiological motion compensation : Asservissement en effort pour des interactions avec des tissus mous et applications pour la compensation de moviments physiologiques. [Doctoral Dissertation]. Université Montpellier II; 2012. Available from: http://www.theses.fr/2012MON20179
NSYSU
6.
Wang, Sheng-Hung.
Modified Motion Estimating Methods for Increasing Video Compression Rate.
Degree: Master, Computer Science and Engineering, 2002, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628102-045507
► In recent years, the internet has been in widespread use and the number of internet subscribers increased quickly. Hence a lot of applications on the…
(more)
▼ In recent years, the internet has been in widespread use and the number of internet subscribers increased quickly. Hence a lot of applications on the network have been developed, multimedia programs especially. Whereas the original video content always takes up considerable storage and transmission time which doesnât suit for network application, many video compression standards have been drawn up in the literature
Due to the temporal redundancy of the video sequences,
motion estimation /
compensation has been widely used in many interframe video coding protocols to reduce the required bit rates for transmission and storage of video signals by eliminating it, such as the MPEG-1, MPEG-2, H.261 and H.263.
The performance and speed of the interframe
motion estimation method for video sequence compression are the important issues especially in networking application such as video conference and video on demand.
Today all
motion estimating method find out the estimating point which has minimal Mean Square Error, and
motion compensation aim at estimating error to do JPEG. compression. As everyone knows, JPEG employs DCT to eliminate the correlation of spatial domain. So the best
motion estimating point is the point which has the minimal compressed data size. In some alalyses show that over 50% best estimating point do not have the minimal compressed data size. So the factor which effects the compressed data size is correlation coefficient and not MSE. Hence, we try to define a new criterion for
motion estimation which can get better
motion compensation with less compressing bit rate. To reach this goal, we try to find out the correlation among the
motion compensation as the new criterion for
motion estimation.
Advisors/Committee Members: Buh-Yun Sher (chair), L.J. Wang (chair), Wen-Shyong Hsieh (committee member).
Subjects/Keywords: motion estimation; video compression; motion compensation
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APA (6th Edition):
Wang, S. (2002). Modified Motion Estimating Methods for Increasing Video Compression Rate. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628102-045507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Sheng-Hung. “Modified Motion Estimating Methods for Increasing Video Compression Rate.” 2002. Thesis, NSYSU. Accessed December 05, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628102-045507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Sheng-Hung. “Modified Motion Estimating Methods for Increasing Video Compression Rate.” 2002. Web. 05 Dec 2019.
Vancouver:
Wang S. Modified Motion Estimating Methods for Increasing Video Compression Rate. [Internet] [Thesis]. NSYSU; 2002. [cited 2019 Dec 05].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628102-045507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang S. Modified Motion Estimating Methods for Increasing Video Compression Rate. [Thesis]. NSYSU; 2002. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628102-045507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Erdogan, Ferhat.
Implementation and Comparison of Motion Estimation Algorithms for Video Coding.
Degree: 2005, , Department of Signal Processing
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5619
► In video coding, motion compensated prediction between the frames is a very efficient way for exploiting temporal correlation. Different motion estimation algorithms have been…
(more)
▼ In video coding, motion compensated prediction between the frames is a very efficient way for exploiting temporal correlation. Different motion estimation algorithms have been developed in order to provide efficient motion compensated prediction of scene motion between frames. In this thesis, full search, fast search, hierarchical search, sub pixel interpolation and mesh based motion estimation algorithms have been implemented. Comparisons are made both in the spatial and temporal domain, mainly in terms of Peak Signal to Noise Ratio (PSNR) and computational complexity. A video codec using lifting based wavelet transform is used for the comparisons in the temporal domain.
Tel:00380632300239
Subjects/Keywords: video coding; motion estimation; motion compensation
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APA (6th Edition):
Erdogan, F. (2005). Implementation and Comparison of Motion Estimation Algorithms for Video Coding. (Thesis). , Department of Signal Processing. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5619
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Erdogan, Ferhat. “Implementation and Comparison of Motion Estimation Algorithms for Video Coding.” 2005. Thesis, , Department of Signal Processing. Accessed December 05, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5619.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Erdogan, Ferhat. “Implementation and Comparison of Motion Estimation Algorithms for Video Coding.” 2005. Web. 05 Dec 2019.
Vancouver:
Erdogan F. Implementation and Comparison of Motion Estimation Algorithms for Video Coding. [Internet] [Thesis]. , Department of Signal Processing; 2005. [cited 2019 Dec 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5619.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Erdogan F. Implementation and Comparison of Motion Estimation Algorithms for Video Coding. [Thesis]. , Department of Signal Processing; 2005. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5619
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
8.
Siplon, Jonathan Page.
Affine Transform Motion Compensation for intermodal Cargo Identification.
Degree: MS, Electrical and Computer Engineering, 2005, Georgia Tech
URL: http://hdl.handle.net/1853/7137
► The volume of cargo flowing through todays transportation system is growing at an ever increasing rate. Recent studies show that 90% of all international cargo…
(more)
▼ The volume of cargo flowing through todays transportation system is growing at an ever increasing rate. Recent studies show that 90% of all international cargo that enters the United States flows through our vast seaport system. When this cargo enters the US, time is of the essence to quickly obtain and verify its identity, screen it against an ever increasingly wide variety of security concerns, and ultimately correctly direct the cargo towards its final destination.
Over the past few years, new port and container security initiatives and regulations have generated huge interest in the need for accurate real-time identification and tracking of incoming and outgoing traffic of vehicles and cargo. On the contrary, the manually intensive identification and tracking processes, typically employed today, are inherently both inefficient and inadequate, and can be seen as a possible enabling factor for potential threats to our ports and therefore our national security. The contradiction between current and required processes coupled to the correlation with accelerated growth in container traffic, has clearly identified the need for a solution.
One heavily researched option is the utilization of video based systems implementing Optical Character Recognition (OCR) processes for automatically extracting the unique container identification code to expedite the flow of cargo through various points in the seaport. The actual current process of how this occurs along with the opportunities and challenges for adding such a technological solution will be investigated in great detail.
This thesis will investigate the feasibility of application of
motion compensation algorithms as an enhancement to OCR systems specifically designed to address the challenges of OCR of cargo containers in a seaport environment. This
motion compensation could offer a cost effective alternative to the sophisticated hardware systems currently being offered to US ports.
Advisors/Committee Members: Jackson, Joel (Committee Chair), AlRegib, Ghassan (Committee Member), Saad, Ashraf (Committee Member).
Subjects/Keywords: Affine motion compensation seaports
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APA (6th Edition):
Siplon, J. P. (2005). Affine Transform Motion Compensation for intermodal Cargo Identification. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7137
Chicago Manual of Style (16th Edition):
Siplon, Jonathan Page. “Affine Transform Motion Compensation for intermodal Cargo Identification.” 2005. Masters Thesis, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/7137.
MLA Handbook (7th Edition):
Siplon, Jonathan Page. “Affine Transform Motion Compensation for intermodal Cargo Identification.” 2005. Web. 05 Dec 2019.
Vancouver:
Siplon JP. Affine Transform Motion Compensation for intermodal Cargo Identification. [Internet] [Masters thesis]. Georgia Tech; 2005. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/7137.
Council of Science Editors:
Siplon JP. Affine Transform Motion Compensation for intermodal Cargo Identification. [Masters Thesis]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7137
University of Cincinnati
9.
Rangarajan, Ranjani.
Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing.
Degree: MS, Engineering and Applied Science: Electrical
Engineering, 2014, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233543
► Compressive Sensing is a new signal processing paradigm that reconstructs a signal that is sampled at a frequency much lower than the Nyquist Rate with…
(more)
▼ Compressive Sensing is a new signal processing
paradigm that reconstructs a signal that is sampled at a frequency
much lower than the Nyquist Rate with very high accuracy.
Compressive Sensing is a ground breaking technology that has
improved data acquisition in many applications including Imaging,
Radar and Communication Systems. It can be applied to any signal
that is inherently sparse or can be represented sparsely in some
domain.On the other hand, Inverse Synthetic Aperture Radar (ISAR)
Imaging is a technique of imaging moving targets with a stationary
radar. Unlike Synthetic Aperture Radar (SAR), the necessary angular
diversity to image the entire target is provided by target
motion.
ISAR naturally lends itself to Compressive Sensing due to the
sparse nature of the target scene. In fact, Compressive Sensing’s
inherent properties such as robustness to noise and minimal data
acquisition have been thoroughly exploited to produce good images
of a target scene in ISAR. ISAR imagery in itself is complex
because the moving targets typically cause a blur in the resultant
image if the
motion parameters are unknown. This can be countered
by using
motion compensation schemes which nullify the blurred
effect due to target
motion. This thesis proposes a simplified
scheme to estimate the complex
motion parameters such as Range,
Velocity and Acceleration. Furthermore, this thesis proposes the
use of sparse probing frequencies to apply Compressive Sensing for
multiple targets, hence retrieving an ISAR image of good
quality.
Advisors/Committee Members: Fan, H. Howard (Committee Chair).
Subjects/Keywords: Electrical Engineering; Compressive Sensing; ISAR; Multiple; Targets; Motion Compensation
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APA (6th Edition):
Rangarajan, R. (2014). Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233543
Chicago Manual of Style (16th Edition):
Rangarajan, Ranjani. “Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing.” 2014. Masters Thesis, University of Cincinnati. Accessed December 05, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233543.
MLA Handbook (7th Edition):
Rangarajan, Ranjani. “Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing.” 2014. Web. 05 Dec 2019.
Vancouver:
Rangarajan R. Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing. [Internet] [Masters thesis]. University of Cincinnati; 2014. [cited 2019 Dec 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233543.
Council of Science Editors:
Rangarajan R. Inverse Synthetic Aperture Radar Imaging for Multiple
Targets Using Compressed Sensing. [Masters Thesis]. University of Cincinnati; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416233543
UCLA
10.
Aliotta, Eric.
In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI.
Degree: Biomedical Physics, 2017, UCLA
URL: http://www.escholarship.org/uc/item/95c1s531
► Diffusion weighted imaging (DWI) is a powerful quantitative magnetic resonance imaging (MRI) technique that can probe tissues in vivo at the microscopic level and provide…
(more)
▼ Diffusion weighted imaging (DWI) is a powerful quantitative magnetic resonance imaging (MRI) technique that can probe tissues in vivo at the microscopic level and provide insight into cellular microstructural environment. Cardiac DWI has great potential value in its ability to answer open questions regarding myocardial structure, dynamics, and remodeling. Unfortunately, several technical limitations of current DWI techniques make its application in the beating heart very challenging, which leads to erroneous or inconsistent results. Amongst the challenges are an extreme sensitivity to bulk physiological motion, low signal to noise ratios (SNR), long scan times, and geometric image distortions. In this dissertation, these limitations are addressed with novel technical developments applied to the DWI pulse sequence including convex optimized diffusion gradient waveform design and multi-parametric tissue characterization.A brief introduction to Nuclear Magnetic Resonance (NMR) and MRI is provided in Chapter 1. This leads into a description of the fundamental components of a DWI acquisition in Chapter 2 and an overview of the current state of cardiac DWI in Chapter 3.In Chapter 4, a novel DWI strategy called Convex Optimized Diffusion Encoding (CODE) is described. CODE is a mathematical framework that formulates diffusion encoding gradient design as a convex optimization problem and automatically generates motion compensated (MOCO) waveforms that achieve the shortest possible echo times (TE) and thus improve SNR. First and second order moment nulled CODE (CODE-M1M2) permits DWI that is robust to cardiac motion with higher SNR than an existing MOCO technique. First order motion compensated CODE-M1 also improves robustness to cardiac induced motion in liver DWI with higher SNR than M1 nulled bipolar DWI. CODE can also be used for non-motion compensated DWI and improves SNR compared with traditional monopolar DWI in the brain.In Chapter 5 we present a multi-parametric DWI strategy that simultaneously yields maps of the apparent diffusion coefficient (ADC) and T2 relaxation time constant in the heart (T2+ADC). Typically, DWI protocols include multiple acquisitions with a range of diffusion encoding strengths (b-value), but with constant TE to isolate the effect of diffusion of the signal. The joint T2+ADC approach varies both b-value and TE within the acquisition to facilitate estimation of both ADC and T2 relaxation. T2+ADC permits joint reconstruction with no increase in scan time compared with DWI alone and no effect on ADC measurement.In Chapter 6 we use CODE-M1M2 diffusion encoding to perform cardiac diffusion tensor imaging (cDTI) and generate maps of myocardial microstructure in healthy volunteers. cDTI can be used to map myocardial fiber and myolaminar sheetlet orientations, which can contribute to our understanding of ventricular microstructure in health and disease and facilitate sophisticated mechanical models of cardiac dynamics. However, it is important to understand the uncertainty underlying these measurements…
Subjects/Keywords: Medical imaging; Cardiac MRI; Convex Optimization; Diffusion MRI; Motion Compensation
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APA (6th Edition):
Aliotta, E. (2017). In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/95c1s531
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Aliotta, Eric. “In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI.” 2017. Thesis, UCLA. Accessed December 05, 2019.
http://www.escholarship.org/uc/item/95c1s531.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Aliotta, Eric. “In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI.” 2017. Web. 05 Dec 2019.
Vancouver:
Aliotta E. In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI. [Internet] [Thesis]. UCLA; 2017. [cited 2019 Dec 05].
Available from: http://www.escholarship.org/uc/item/95c1s531.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Aliotta E. In Vivo Quantification of Cardiac Microstructure with Convex Optimized Diffusion Weighted MRI. [Thesis]. UCLA; 2017. Available from: http://www.escholarship.org/uc/item/95c1s531
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
11.
Yang, Duo.
Low-Complexity Compression Techniques for High Frame Rate Video.
Degree: MASc, 2017, McMaster University
URL: http://hdl.handle.net/11375/22193
► Recently, video has become one of the most important multimedia resources to be shared in our work and daily life. With the development of high…
(more)
▼ Recently, video has become one of the most important multimedia resources to be shared in our work and daily life. With the development of high frame rate video (HFV), the write speed from high speed camera array sensor to the massive data storage device has been regarded as the main constraints on HFV applications. In this thesis, some low-complexity compression techniques are proposed for HFV acquisition and transmission. The core technique of our developed codec is the application of Slepian-Wolf coding theorem in video compression. The light-duty encoder employs SW encoding, resulting in lower computational cost. The pixel values are transformed into bit sequences, and then we assemble the bits on same bit plane into 8 bit streams. For each bit plane, there is a statistical BSC being constructed to describe the dependency between the source image and the SI image. Furthermore, an improved coding scheme is applied to exploit the spatial correlation between two consecutive bit planes, which is able to reduce the source coding rates. Different from the encoder, the collaborative heavy-duty decoder shoulders the burden of realizing high reconstruction fidelity. Motion estimation and motion compensation employ the block-matching algorithm to predict the SI image. And then the received syndrome sequence is able to be SW decoded with SI. To realize different compression goals, compression are separated to the original and the downsampled cases. With regard to the compression at the original resolution, it completes after SW decoding. While with respect to compression at reduced resolution, the SW decoded image is necessary to be upsampled by the state-of-the-art learning based SR technique: A+ . Since there are some important image details lost after the resolution resizing, ME and MC is applied to modify the upsampled image again, promoting the reconstruction PSNR. Experimental results show that the proposed low-complexity compression techniques are effective on improving reconstruction fidelity and compression ratio.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Chen, Jun, Wu, Xiaolin, Electrical and Computer Engineering.
Subjects/Keywords: video compression; low-complexity; Slepian-Wolf coding; motion estimation and compensation
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APA (6th Edition):
Yang, D. (2017). Low-Complexity Compression Techniques for High Frame Rate Video. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/22193
Chicago Manual of Style (16th Edition):
Yang, Duo. “Low-Complexity Compression Techniques for High Frame Rate Video.” 2017. Masters Thesis, McMaster University. Accessed December 05, 2019.
http://hdl.handle.net/11375/22193.
MLA Handbook (7th Edition):
Yang, Duo. “Low-Complexity Compression Techniques for High Frame Rate Video.” 2017. Web. 05 Dec 2019.
Vancouver:
Yang D. Low-Complexity Compression Techniques for High Frame Rate Video. [Internet] [Masters thesis]. McMaster University; 2017. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/11375/22193.
Council of Science Editors:
Yang D. Low-Complexity Compression Techniques for High Frame Rate Video. [Masters Thesis]. McMaster University; 2017. Available from: http://hdl.handle.net/11375/22193
Delft University of Technology
12.
Wiegerink, J.J.
Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:dceb6c02-7324-470b-b2df-aa2542b11fa4
► This report presents a method to calculate the frequency characteristics of a vessel that takes into account the dynamic interaction between the vessel and the…
(more)
▼ This report presents a method to calculate the frequency characteristics of a vessel that takes into account the dynamic interaction between the vessel and the Ampelmann system. Insight is provided into the dynamic interaction between the vessel and the Ampelmann system and the factors are identified that determine the changing dynamic behaviour of the vessel when the Ampelmann system is activated. Amplified vessel motions reduce the practical workability. The coupled frequency characteristics form input to Ampelmann's workability assessment and a more accurate estimation of the practical workability is obtained. An alternative
compensation method is proposed that favours vessel motions and significantly increases the workability of the Ampelmann system on a vessel.
Advisors/Committee Members: Huijsmans, R.H.M., Van Leer, A., Gutiérrez, M.A., Den Haan, J., Miedema, S.A..
Subjects/Keywords: vessel frequency characteristics; dynamic interaction; motion compensation; workability; Ampelmann system
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APA (6th Edition):
Wiegerink, J. J. (2015). Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:dceb6c02-7324-470b-b2df-aa2542b11fa4
Chicago Manual of Style (16th Edition):
Wiegerink, J J. “Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:.” 2015. Masters Thesis, Delft University of Technology. Accessed December 05, 2019.
http://resolver.tudelft.nl/uuid:dceb6c02-7324-470b-b2df-aa2542b11fa4.
MLA Handbook (7th Edition):
Wiegerink, J J. “Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:.” 2015. Web. 05 Dec 2019.
Vancouver:
Wiegerink JJ. Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2019 Dec 05].
Available from: http://resolver.tudelft.nl/uuid:dceb6c02-7324-470b-b2df-aa2542b11fa4.
Council of Science Editors:
Wiegerink JJ. Modelling of Coupled Vessel-Ampelmann Systems for Workability Studies:. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:dceb6c02-7324-470b-b2df-aa2542b11fa4
NSYSU
13.
Fu, Hao-fong.
A study for a non-blocked motion compensation design.
Degree: Master, Electrical Engineering, 2018, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630118-153731
► MEPG and H.26X series are two major standards of video compression. Motion compensation is an important method in the above standards. In this thesis, we…
(more)
▼ MEPG and H.26X series are two major standards of video compression.
Motion compensation is an important method in the above standards. In this thesis, we follow a new method of non-block
motion compensation proposed by our Lab before to compare with traditional block
motion compensation. We study the visual quality and data compression for both methods.
In the traditional MPEG, we scan whole image to calculate the
motion compensation with fixed 16*16 block as an unit. Furthermore, we record the difference the shift of blocks. In some specific circumstances, it is not suitable to separate the real shape of object by blocks, which may cause a huge data as a result. There are two stage in our study. In stage one, we use optical flow (OF) to separate the area of
motion object. In stage two, we get the corresponding parameters for geometry transformation to record a small amount of data.
We do our experiments by replacing
motion compensation in the original MPEG-1 system. We also modify the images by mathematical morphology. It was found that the final restoration effect and the data compression effect was not as satisfactory as expected.
Advisors/Committee Members: Ben-shung Chow (committee member), Tsang-ling Sheu (chair), Tsung Li (chair), Ming-feng Li (chair).
Subjects/Keywords: MPEG; Motion compensation; Mathematical morphology; Optical flow; Video compression
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APA (6th Edition):
Fu, H. (2018). A study for a non-blocked motion compensation design. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630118-153731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fu, Hao-fong. “A study for a non-blocked motion compensation design.” 2018. Thesis, NSYSU. Accessed December 05, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630118-153731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fu, Hao-fong. “A study for a non-blocked motion compensation design.” 2018. Web. 05 Dec 2019.
Vancouver:
Fu H. A study for a non-blocked motion compensation design. [Internet] [Thesis]. NSYSU; 2018. [cited 2019 Dec 05].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630118-153731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fu H. A study for a non-blocked motion compensation design. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630118-153731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
14.
Tan, Jeremy.
Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry.
Degree: 2016, University of Toronto
URL: http://hdl.handle.net/1807/92627
► High-intensity focused ultrasound is a non-invasive heat-based therapy, which is often guided by magnetic resonance (MR) thermometry. MR thermometry provides accurate temperature measurement at the…
(more)
▼ High-intensity focused ultrasound is a non-invasive heat-based therapy, which is often guided by magnetic resonance (MR) thermometry. MR thermometry provides accurate temperature measurement at the target and in surrounding tissue. This is critical to ensure that sufficient thermal dose is achieved and to monitor for collateral damage. Unfortunately, MR thermometry is severely compromised by motion and susceptibility artifacts that are caused by respiration (periodic motion) and peristalsis (aperiodic motion). A hybrid method has been designed to correct these artifacts using principal component analysis as a multi-baseline method, and projection onto dipole fields as a near-referenceless approach. In vivo measurements in porcine and human kidneys, achieved a temperature stability and precision of 0.85 째C and 1.00 째C, respectively, without the need for any user-interaction or supplementary tracking tools. This is about twice as accurate as the leading hybrid method, which scored 1.97 째C and 2.22 째C, respectively, on the same data.
M.H.Sc.
2018-11-30 00:00:00
Advisors/Committee Members: Drake, James M, Waspe, Adam C, Biomedical Engineering.
Subjects/Keywords: High-Intensity Focused Ultrasound; Magnetic Resonance Thermometry; Motion compensation; MRI; 0541
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APA (6th Edition):
Tan, J. (2016). Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/92627
Chicago Manual of Style (16th Edition):
Tan, Jeremy. “Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry.” 2016. Masters Thesis, University of Toronto. Accessed December 05, 2019.
http://hdl.handle.net/1807/92627.
MLA Handbook (7th Edition):
Tan, Jeremy. “Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry.” 2016. Web. 05 Dec 2019.
Vancouver:
Tan J. Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry. [Internet] [Masters thesis]. University of Toronto; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1807/92627.
Council of Science Editors:
Tan J. Motion Compensation using Principal Component Analysis and Projection onto Dipole Fields for Abdominal Magnetic Resonance Thermometry. [Masters Thesis]. University of Toronto; 2016. Available from: http://hdl.handle.net/1807/92627
University of Edinburgh
15.
Cannon, Cormac.
Motion-compensation for complementary-coded medical ultrasonic imaging.
Degree: PhD, 2010, University of Edinburgh
URL: http://hdl.handle.net/1842/3768
► Ultrasound is a well-established tool for medical imaging. It is non-invasive and relatively inexpensive, but the severe attenuation caused by propagation through tissue limits its…
(more)
▼ Ultrasound is a well-established tool for medical imaging. It is non-invasive and relatively inexpensive, but the severe attenuation caused by propagation through tissue limits its effectiveness for deep imaging. In recent years, the ready availability of fast, inexpensive computer hardware has facilitated the adoption of signal coding and compression techniques to counteract the effects of attenuation. Despite widespread investigation of the topic, published opinions vary as to the relative suitability of discrete-phase-modulated and frequency-modulated (or continuous-phase-modulated) signals for ultrasonic imaging applications. This thesis compares the performance of discrete binary-phase coded pulses to that of frequency-modulated pulses at the higher imaging frequencies at which the effects of attenuation are most severe. The performance of linear and non-linear frequency modulated pulses with optimal side-lobe characteristics is compared to
that of complementary binary-phase coded pulses by simulation and experiment. Binary-phase coded pulses are shown to be more robust to the affects of attenuation and non-ideal transducers. The comparatively poor performance of frequency-modulated pulses is explained in terms of the spectral characteristics of the signals and filters required to reduce side-lobes to levels acceptable for imaging purposes. In theory, complementary code sets like bi-phase Golay pairs offer optimum side-lobe performance at the expense of a reduction in frame rate. In practice, misalignment caused by motion in the medium can have a severe impact on imaging performance. A novel motioncompensated imaging algorithm designed to reduce the occurrence of motion artefacts and eliminate the reduction in frame-rate associated with complementary-coding is presented. This is initially applied to conventional sequential-scan B-mode imaging then adapted for use in synthetic aperture B-mode imaging. Simulation results
are presented comparing the performance of the motion-compensated sequential-scan and synthetic aperture systems with that of simulated systems using uncoded and frequency-modulated excitation pulses.
Subjects/Keywords: 616.07; ultrasound; medical imaging; signal coding; motion compensation; synthetic aperture ultrasound
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APA (6th Edition):
Cannon, C. (2010). Motion-compensation for complementary-coded medical ultrasonic imaging. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/3768
Chicago Manual of Style (16th Edition):
Cannon, Cormac. “Motion-compensation for complementary-coded medical ultrasonic imaging.” 2010. Doctoral Dissertation, University of Edinburgh. Accessed December 05, 2019.
http://hdl.handle.net/1842/3768.
MLA Handbook (7th Edition):
Cannon, Cormac. “Motion-compensation for complementary-coded medical ultrasonic imaging.” 2010. Web. 05 Dec 2019.
Vancouver:
Cannon C. Motion-compensation for complementary-coded medical ultrasonic imaging. [Internet] [Doctoral dissertation]. University of Edinburgh; 2010. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1842/3768.
Council of Science Editors:
Cannon C. Motion-compensation for complementary-coded medical ultrasonic imaging. [Doctoral Dissertation]. University of Edinburgh; 2010. Available from: http://hdl.handle.net/1842/3768
INP Toulouse
16.
Ouksili, Zehor.
Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images.
Degree: Docteur es, Informatique, 2010, INP Toulouse
URL: http://www.theses.fr/2010INPT0025
► Cette thèse traite du mouvement respiratoire dans l'imagerie TEP/TDM. L'imagerie TEP est une modalité à exposition longue très influencée par les mouvements involontaires du patient.…
(more)
▼ Cette thèse traite du mouvement respiratoire dans l'imagerie TEP/TDM. L'imagerie TEP est une modalité à exposition longue très influencée par les mouvements involontaires du patient. Ces mouvements produisent des artéfacts dont les conséquences sont sérieuses pour le diagnostic car les tumeurs paraissent plus larges et moins actives. Cette thèse contribue à la résolution de ce problème. En plus de proposer l'architecture d'un système d'acquisition TEP/TDM synchronisée à la respiration, on y développe trois méthodes de traitement de signal et d'images qui peuvent être appliquées pour résoudre différents sous-problèmes: Une méthode originale de segmentation et caractérisation du signal respiratoire pour découvrir les patterns respiratoires "normaux" du patient, une méthode de reconstruction TDM-4D qui permet d'obtenir des images anatomiques du corps à chaque niveau respiratoire désiré et un algorithme itératif amélioré pour reconstruire des images TEP-4D compensées en mouvement respiratoire. Toutes ces méthodes et algorithmes ont été validés et testés sur des données simulées, des données de fantômes, et des données réelles de patients.
This thesis deals with respiratory motion in PET/CT images. It is well known that PET is a modality that requires a long exposure time. During this time, patients moves and breath. These motions produce undesirable artefacts that alter seriously the images and their precision. This has important consequences when diagnosing thoracic, and particularly pulmonary, cancer. Tumours appear larger than they really are and their activity is weaker. This thesis proposes to contribute to solving these problems.We propose the architecture of an integrated PET/CT acquisition system synchronized to respiration. We also develop signal and image processing methods that can be applied to eliminating respiratory artefacts in CT and PET images. The thesis brings three main contributions : An original respiratory signal segmentation and characterization to detect "normal" respiratory patterns, a 4D-CT reconstruction method that creates 3D images of the whole body for any respiratory level and an enhanced iterative algorithm for reconstructing 4D-PET images without respiratory artefacts. The developed methods have validated and tested on simulated, phantom and real patients' data.
Advisors/Committee Members: Batatia, Hadj (thesis director), Ayache, Alain (thesis director).
Subjects/Keywords: Tomographie par émission; Caractérisation respiratoire; Compensation de mouvement; Tomodensitométrie 4D; Emission tomography; Respiratory characterization; Motion compensation; 4d-ct
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APA ·
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APA (6th Edition):
Ouksili, Z. (2010). Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2010INPT0025
Chicago Manual of Style (16th Edition):
Ouksili, Zehor. “Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images.” 2010. Doctoral Dissertation, INP Toulouse. Accessed December 05, 2019.
http://www.theses.fr/2010INPT0025.
MLA Handbook (7th Edition):
Ouksili, Zehor. “Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images.” 2010. Web. 05 Dec 2019.
Vancouver:
Ouksili Z. Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images. [Internet] [Doctoral dissertation]. INP Toulouse; 2010. [cited 2019 Dec 05].
Available from: http://www.theses.fr/2010INPT0025.
Council of Science Editors:
Ouksili Z. Compensation du mouvement respiratoire dans les images TEP/TDM thoraciques : Respiratory motion compensation in thoracic PET/CT images. [Doctoral Dissertation]. INP Toulouse; 2010. Available from: http://www.theses.fr/2010INPT0025
17.
Albakri, Abdulrahman.
Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot.
Degree: Docteur es, SYAM - Systèmes Automatiques et Micro-Électroniques, 2015, Montpellier
URL: http://www.theses.fr/2015MONTS189
► Dans ce travail de thèse, nous examinons les principaux facteurs affectant la transparence d'un schéma de téléopération dans le contexte de la robotique médicale.Afin de…
(more)
▼ Dans ce travail de thèse, nous examinons les principaux facteurs affectant la transparence d'un schéma de téléopération dans le contexte de la robotique médicale.Afin de déterminer ces facteurs, une analyse approfondie de l'état de l'art a été réalisée ce qui a permis de proposer une nouvelle classification de schémas de téléopération avec retour haptique.Le rôle de ces principaux facteurs a été analysé.Ces facteurs sont liés à l'architecture de commande appliquée, aux perturbations provoquées par les mouvements physiologiques des tissus manipulés ainsi qu'à la précision du modèle d'interaction robot-tissue.Les performances du schéma de téléopération à architecture 3-canaux ont été analysées en simulation pour choisir une architecture de commande dédiée aux applications médicales.Ensuite, l'influence des mouvements physiologiques de l'environnement manipulé sur la transparence du système a été analysée et un nouveau modèle d'interaction avec des tissus mous a été proposé.Un schéma de commande de téléopération basé modèle d'interaction a été proposé en se basant sur une analyse de passivité du port d'interaction robot-environnement.Enfin, l'importance de la précision du modèle d'interaction (robot-tissue) sur la transparence du schéma de téléopération avec retour d'effort basé-modèle a été analysée.Cette analyse a été validée en théorie et expérimentalement en implémentant le modèle Hunt-Crossly dans une commande utilisant un AOB pour réaliser une téléopération avec retour haptique.En conclusion de ce travail, les résultats de cette thèse ont été discutés et les perspectives futures ont également été proposées.
This thesis investigates the major factors affecting teleoperation transparency in medical context.A wide state of art survey is carried out and a new point of view to classify haptic teleoperation literature is proposed in order to extract the decisive factors providing a transparent teleoperation.Furthermore, the roles of three aspects have been analysed.First, The role of the applied control architecture.To this aim, the performances of 3-channel teleoperation are analysed and guidelines to select a suitable control architecture for medical applications are proposed.The validation of these guidelines is illustrated through simulations.Second, the effects of motion disturbance in the manipulated environment on telepresence are analysed.Consequently, a new model of such moving environment is proposed and the applicability of the proposed model is shown through interaction port passivity investigation.Third analysed factor is the role of the interaction model accuracy on the transparency of interaction control based haptic teleoperation.This analysis is performed theoretically and experimentally by the design and implementation of Hunt-Crossly in AOB interaction control haptic teleoperation.The results are discussed and the future perspectives are proposed.
Advisors/Committee Members: Poignet, Philippe (thesis director).
Subjects/Keywords: Robotiques Medicale; Telechirurgie; Teleoperation; Compensation de mouvement; Retour haptique; Medical robotics; Telesurgery; Teleoperation; Motion compensation; Haptics
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APA (6th Edition):
Albakri, A. (2015). Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2015MONTS189
Chicago Manual of Style (16th Edition):
Albakri, Abdulrahman. “Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot.” 2015. Doctoral Dissertation, Montpellier. Accessed December 05, 2019.
http://www.theses.fr/2015MONTS189.
MLA Handbook (7th Edition):
Albakri, Abdulrahman. “Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot.” 2015. Web. 05 Dec 2019.
Vancouver:
Albakri A. Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot. [Internet] [Doctoral dissertation]. Montpellier; 2015. [cited 2019 Dec 05].
Available from: http://www.theses.fr/2015MONTS189.
Council of Science Editors:
Albakri A. Haptic Teleoperation for Robotic-Assisted Surgery : Téléopération avec retour haptique pour chirurgies assistées par robot. [Doctoral Dissertation]. Montpellier; 2015. Available from: http://www.theses.fr/2015MONTS189
18.
Joinie-Maurin, Mathieu.
Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs.
Degree: Docteur es, Robotique, 2012, Université de Strasbourg
URL: http://www.theses.fr/2012STRAD017
► Le geste médical assisté par ordinateur en salle d'opération n'a pas cessé de progresser lors de ladernière décennie. Ce phénomène est lié à l'évolution des…
(more)
▼ Le geste médical assisté par ordinateur en salle d'opération n'a pas cessé de progresser lors de ladernière décennie. Ce phénomène est lié à l'évolution des techniques de chirurgie et notamment àl'apparition des techniques dites mini-invasives. Cette pratique bien que révolutionnaire car ellepermet de diminuer les risques d'infection a introduit de nombreux problèmes. En effet, lechirurgien est limité dans ses gestes à cause de la restriction de mouvement imposée par les trocarts.De ce fait, la communauté robotique s'est assez rapidement intéressée aux problématiques deschirurgiens afin de développer des dispositifs robotisés adaptés. Un des grands thèmes étudié estcelui de la téléopération. Cette dernière consiste à utiliser deux dispositifs robotisés communémentappelés: maître et esclave. Dans le contexte médical, le robot maître est manoeuvré par le chirurgienet le robot esclave est au contact de l'organe à opérer. La première génération de ces systèmes nepermettait pas au chirurgien de ressentir les efforts qu'il exerçait sur les organes du patient. Unedeuxième génération de dispositifs est apparue en introduisant le retour d'efforts. Au delà desproblèmes de stabilité et de commande rencontrés, de tels systèmes permettent de réduire lesimperfections du geste humain ou d'en augmenter les capacités. Une des gênes constatées par leschirurgiens lors de l'utilisation de tels systèmes est le mouvement physiologique des organes àopérer.Cette thèse s'est principalement focalisée sur le thème de la compensation des mouvementsphysiologiques dans le cadre de la téléopération avec retour d'efforts. L'objectif étant de démontrerqu'il est possible pour le chirurgien de téléopérer un organe soumis à des mouvementsphysiologiques, et notamment le mouvement respiratoire, sans qu'il ne ressente cette perturbation.[...]
Computer aided medical gesture kept increasing during the last decade. This phenomenon is linkedto the evolution of surgical technique and specially the use of minimally invasive surgery. Thisrevolutionary technique allows reducing infection risks but introduces new problems. Indeed, thesurgeon has limited motion capability because the use of trocars. Therefore, robotics communityinterest has kept growing in order to develop specific robotized devices. One of the most currentstudied topics is teleoperation in which two robots are used: the master and the slave. In a medicalcontext, the master robot is manipulated by the surgeon and the slave robot is in contact with theoperated organ. The first generation of those systems did not allow the surgeon to feel how muchforce he applies on the patient. Then with the second generation, force-feedback was introduced.Even if this technique introduces new problems such as control and stability, it also allows medicalgesture improvements. One commonly cited problem is the physiological motion of organs forexample.This thesis mainly focuses on the subject of physiological motion compensation in the context ofmedical force feedback teleoperation. The aim is to prove that the…
Advisors/Committee Members: Gangloff, Jacques (thesis director).
Subjects/Keywords: Robotique médicale; Compensation; Mouvement physiologique; Mouvement respiratoire; Téléopération; Medical robotics; Compensation; Physiological motion; 610.28; 616.07; 629.89
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APA (6th Edition):
Joinie-Maurin, M. (2012). Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2012STRAD017
Chicago Manual of Style (16th Edition):
Joinie-Maurin, Mathieu. “Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs.” 2012. Doctoral Dissertation, Université de Strasbourg. Accessed December 05, 2019.
http://www.theses.fr/2012STRAD017.
MLA Handbook (7th Edition):
Joinie-Maurin, Mathieu. “Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs.” 2012. Web. 05 Dec 2019.
Vancouver:
Joinie-Maurin M. Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2012. [cited 2019 Dec 05].
Available from: http://www.theses.fr/2012STRAD017.
Council of Science Editors:
Joinie-Maurin M. Téléchirurgie robotisée au contact d'organes mobiles : Robotized telesurgery in contact with moving organs. [Doctoral Dissertation]. Université de Strasbourg; 2012. Available from: http://www.theses.fr/2012STRAD017
19.
Ledesma-Carbayo, Maria J.
Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging.
Degree: 2010, University of Patras
URL: http://nemertes.lis.upatras.gr/jspui/handle/10889/4452
► This thesis belongs to the research line of Biomedical Imaging Tecnologies and proposes as main objective to develop and research spatio-temporal non-rigid registration methods to…
(more)
▼ This thesis belongs to the research line of
Biomedical Imaging Tecnologies and proposes as main objective to
develop and research spatio-temporal non-rigid registration methods to estimate and compesate motion in cardiac magnetic resonance sequences and to validate and verify the suitability of those techniques in the clinical environment.
-
Advisors/Committee Members: Παλληκαράκης, Νικόλαος, Παλληκαράκης, Νικόλαος.
Subjects/Keywords: Motion estimation; Motion compensation; Cardiac imaging; Magnetic resonance; Image registration; 616.075 48; Εκτίμηση κίνησης; Καρδιακή απεικόνιση
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APA (6th Edition):
Ledesma-Carbayo, M. J. (2010). Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging. (Masters Thesis). University of Patras. Retrieved from http://nemertes.lis.upatras.gr/jspui/handle/10889/4452
Chicago Manual of Style (16th Edition):
Ledesma-Carbayo, Maria J. “Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging.” 2010. Masters Thesis, University of Patras. Accessed December 05, 2019.
http://nemertes.lis.upatras.gr/jspui/handle/10889/4452.
MLA Handbook (7th Edition):
Ledesma-Carbayo, Maria J. “Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging.” 2010. Web. 05 Dec 2019.
Vancouver:
Ledesma-Carbayo MJ. Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging. [Internet] [Masters thesis]. University of Patras; 2010. [cited 2019 Dec 05].
Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/4452.
Council of Science Editors:
Ledesma-Carbayo MJ. Motion compensation and motion estimation techniques in cardiac magnetic resonance imaging. [Masters Thesis]. University of Patras; 2010. Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/4452
University of New South Wales
20.
Mathew, Reji Kuruvilla.
Quad-tree motion models for scalable video coding applications.
Degree: Electrical Engineering & Telecommunications, 2009, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/44600
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:7897/SOURCE1?view=true
► Modeling the motion that occurs between frames of a video sequence is a key component of video coding applications. Typically it is not possible to…
(more)
▼ Modeling the
motion that occurs between frames of a video sequence is a key component of video coding applications. Typically it is not possible to represent the
motion between frames by a single model and therefore a quad-tree structure is employed where smaller, variable size regions or blocks are allowed to take on separate
motion models. Quad-tree structures however suffer from two fundamental forms of redundancy. First, quad-trees exhibit structural redundancy due to their inability to exploit the dependence between neighboring leaf nodes with different parents. The second form of redundancy is due to the quad-tree structure itself being limited to capture only horizontal and vertical edge discontinuities at dyadically related locations; this means that general discontinuities in the
motion field, such as those caused by boundaries of moving objects, become difficult and expensive to model.In our work, we address the issue of structural redundancy by introducing leaf merging. We describe how the intuitively appealing leaf merging step can be incorporated into quad-tree
motion representations for a range
motion modeling contexts. In particular, the impact of rate-distortion (R-D) optimized merging for two
motion coding schemes, these being spatially predictive coding, as used by H.264, and hierarchical coding, are considered. Our experimental results demonstrate that the merging step can provide significant gains in R-D performance for both the hierarchical and spatial prediction schemes. Hierarchical coding has the advantage that it offers scalable access to the
motion information; however due to the redundancy it introduces hierarchical coding has not been traditionally pursued. Our work shows that much of this redundancy can be mitigated with the introduction of merging. To enable scalable decoding, we employ a merging scheme which ensures that the dependencies introduced via merging can be hierarchically decoded. Theoretical investigations confirm the inherent advantages of leaf merging for quad-tree
motion models.To enable quad-tree structures to better model
motion discontinuity boundaries, we introduce geometry information to the quad-tree representation. We choose to model
motion and geometry using separate quad-tree structures; thereby enabling each attribute to be refined separately. We extend the leaf merging paradigm to incorporate the dual tree structure allowing regions to be formed that have both
motion and geometry attributes,
subject to rate-distortion optimization considerations. We employ hierarchical coding for the
motion and geometry information and ensure that the merging process retains the property of resolution scalability. Experimental results show that the R-D performance of the merged dual tree representation, is significantly better than conventional
motion modeling schemes. Theoretical investigations show that if both
motion and boundary geometry can be perfectly modeled, then the merged dual tree representation is able to achieve optimal R-D performance.We explore resolution…
Advisors/Committee Members: Taubman, David, Electrical Engineering & Telecommunications, Faculty of Engineering, UNSW, Zhang, Jian, National Information & Communication Technology Australia, UNSW.
Subjects/Keywords: Video coding; Motion model; Motion compensation; Quad-tree
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APA (6th Edition):
Mathew, R. K. (2009). Quad-tree motion models for scalable video coding applications. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/44600 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:7897/SOURCE1?view=true
Chicago Manual of Style (16th Edition):
Mathew, Reji Kuruvilla. “Quad-tree motion models for scalable video coding applications.” 2009. Doctoral Dissertation, University of New South Wales. Accessed December 05, 2019.
http://handle.unsw.edu.au/1959.4/44600 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:7897/SOURCE1?view=true.
MLA Handbook (7th Edition):
Mathew, Reji Kuruvilla. “Quad-tree motion models for scalable video coding applications.” 2009. Web. 05 Dec 2019.
Vancouver:
Mathew RK. Quad-tree motion models for scalable video coding applications. [Internet] [Doctoral dissertation]. University of New South Wales; 2009. [cited 2019 Dec 05].
Available from: http://handle.unsw.edu.au/1959.4/44600 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:7897/SOURCE1?view=true.
Council of Science Editors:
Mathew RK. Quad-tree motion models for scalable video coding applications. [Doctoral Dissertation]. University of New South Wales; 2009. Available from: http://handle.unsw.edu.au/1959.4/44600 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:7897/SOURCE1?view=true
University of Utah
21.
Welsh, Christopher Lee.
Advanced imaging tools for quantifying cardiac microstructure.
Degree: PhD, Bioengineering, 2015, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4001/rec/157
► Diffusion tensor MRI (DT-MRI or DTI) has been proven useful for characterizing biological tissue microstructure, with the majority of DTI studies having been performed previously…
(more)
▼ Diffusion tensor MRI (DT-MRI or DTI) has been proven useful for characterizing biological tissue microstructure, with the majority of DTI studies having been performed previously in the brain. Other studies have shown that changes in DTI parameters are detectable in the presence of cardiac pathology, recovery, and development, and provide insight into the microstructural mechanisms of these processes. However, the technical challenges of implementing cardiac DTI in vivo, including prohibitive scan times inherent to DTI and measuring small-scale diffusion in the beating heart, have limited its widespread usage. This research aims to address these technical challenges by: (1) formulating a model-based reconstruction algorithm to accurately estimate DTI parameters directly from fewer MRI measurements and (2) designing novel diffusion encoding MRI pulse sequences that compensate for the higher-order motion of the beating heart. The model-based reconstruction method was tested on undersampled DTI data and its performance was compared against other state-of-the-art reconstruction algorithms. Model-based reconstruction was shown to produce DTI parameter maps with less blurring and noise and to estimate global DTI parameters more accurately than alternative methods. Through numerical simulations and experimental demonstrations in live rats, higher-order motion compensated diffusion-encoding was shown to successfully eliminate signal loss due to motion, which in turn produced data of sufficient quality to accurately estimate DTI parameters, such as fiber helix angle. Ultimately, the model-based reconstruction and higher-order motion compensation methods were combined to characterize changes in the cardiac microstructure in a rat model with inducible arterial hypertension in order to demonstrate the ability of cardiac DTI to detect pathological changes in living myocardium.
Subjects/Keywords: Compressed Sensing; Constrained Reconstruction; Diffusion Tensor Imaging; Magnetic Resonance Imaging; Motion Compensation; Small Animal Imaging
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APA (6th Edition):
Welsh, C. L. (2015). Advanced imaging tools for quantifying cardiac microstructure. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4001/rec/157
Chicago Manual of Style (16th Edition):
Welsh, Christopher Lee. “Advanced imaging tools for quantifying cardiac microstructure.” 2015. Doctoral Dissertation, University of Utah. Accessed December 05, 2019.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4001/rec/157.
MLA Handbook (7th Edition):
Welsh, Christopher Lee. “Advanced imaging tools for quantifying cardiac microstructure.” 2015. Web. 05 Dec 2019.
Vancouver:
Welsh CL. Advanced imaging tools for quantifying cardiac microstructure. [Internet] [Doctoral dissertation]. University of Utah; 2015. [cited 2019 Dec 05].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4001/rec/157.
Council of Science Editors:
Welsh CL. Advanced imaging tools for quantifying cardiac microstructure. [Doctoral Dissertation]. University of Utah; 2015. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4001/rec/157
Georgia Tech
22.
Cook, Daniel A.
Synthetic Aperture Sonar Motion Estimation and Compensation.
Degree: MS, Electrical and Computer Engineering, 2007, Georgia Tech
URL: http://hdl.handle.net/1853/14538
► Synthetic aperture sonar (SAS) is the underwater acoustic counterpart to stripmap-mode synthetic aperture radar (SAR). Current seagoing SAS systems are deployed on unmanned robotic vechicles,…
(more)
▼ Synthetic aperture sonar (SAS) is the underwater acoustic counterpart to stripmap-mode synthetic aperture radar (SAR). Current seagoing SAS systems are deployed on unmanned robotic vechicles, commonly referred to as autonomous underwater vehicles (AUVs). As with SAR, SAS imaging is ideally done with a straight-line collection trajectory. However, SAS is far more susceptible to image degradation caused by the actual sensor trajectory deviating from a pefectly straight line. Unwanted
motion is virtually unavoidable in the sea due to the influence of currents and wave action. In order to construct a perfectly-focused SAS image the
motion must either be constrained to within one-eighth of a wavelength over the synthetic aperture, or it must be measured with the same degree of accuracy and then accounted for in the processing software. Since the former is not possible, the latter approach must be taken. The technique known as redundant phase centers (RPC) has proven to be insrumental in solving the problem of SAS
motion compensation. In essence, RPC simply refers to the practice of overlapping a portion of the receiver array from one ping (transmission and reception) to the next. The signals observed by this overlapping portion will be identical except for a time shift proportional to the relative
motion between pings. The time shifts observed by the RPC channels of the receiver array are scalars representing the projection of the array receiver locations onto the image slant plane, and these time shifts can be used to compensate for the unwanted platform
motion. This thesis presents several extensions to the standard RPC technique in which the RPC time delays are combined with the AUV's on-board navigation data. The scalar time delays are decomposed into the components induced by the six degrees of freedom of the
motion: i.e., the linear and angular velocities. Thus, the time delays observed in the image slant plane can be used to refine the
motion estimate in an absolute frame of reference external to the AUV. Creating a high-resolution SAS image of the sea floor in an automatic fashion demands accurate and robust
motion estimation. The performance of the
motion estimation schemes presented is demonstrated using actual field data collected from an assortment of current research SAS systems.
Advisors/Committee Members: Richards, Mark (Committee Chair), McClellan, James (Committee Member), Yezzi, Anthony (Committee Member), Zhou, Hao-Min (Committee Member).
Subjects/Keywords: Motion compensation; Imaging; High resolution; Ocean
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APA (6th Edition):
Cook, D. A. (2007). Synthetic Aperture Sonar Motion Estimation and Compensation. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14538
Chicago Manual of Style (16th Edition):
Cook, Daniel A. “Synthetic Aperture Sonar Motion Estimation and Compensation.” 2007. Masters Thesis, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/14538.
MLA Handbook (7th Edition):
Cook, Daniel A. “Synthetic Aperture Sonar Motion Estimation and Compensation.” 2007. Web. 05 Dec 2019.
Vancouver:
Cook DA. Synthetic Aperture Sonar Motion Estimation and Compensation. [Internet] [Masters thesis]. Georgia Tech; 2007. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/14538.
Council of Science Editors:
Cook DA. Synthetic Aperture Sonar Motion Estimation and Compensation. [Masters Thesis]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/14538
UCLA
23.
Nguyen, Christopher Tam.
Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure.
Degree: Biomedical Engineering, 2015, UCLA
URL: http://www.escholarship.org/uc/item/8397m84g
► In 2011, cardiovascular disease (CVD) is the number one killer in the United States accounting for 31.3% or about 1 in 3 deaths (786,000 of…
(more)
▼ In 2011, cardiovascular disease (CVD) is the number one killer in the United States accounting for 31.3% or about 1 in 3 deaths (786,000 of 2.51 million). Heart failure represented 36.1% of the total number of CVD deaths or 1 in 9 total US deaths. A key prognostic indicator of heart failure is the presence and extent of myocardial fibrosis, which is found in all three main CVD etiologies including systolic dysfunction, non-ischemic cardiomyopathy, and valvular disease. Non-invasive myocardial tissue characterization to detect and characterize MF is highly sought after clinical tool because of its prognostic value. Current technologies include both contrast-based and contrast-free cardiovascular magnetic resonance (CMR) imaging approaches. Although contrast-based CMR methods are clinically in routine use, a significant portion of CVD patients (about 1 in 3) also have renal insufficiency requiring a contrast-free approach.One promising contrast-free CMR approach is diffusion CMR, which is capable of unique tissue characterization by being sensitivity to the microscopic motion of water molecules in tissue. Specific to myocardial tissue characterization of fibrosis, it potentially offers the highest contrast (>50% signal change) between myocardial fibrosis compared to normal myocardium. More importantly, it has the potential to map myofiber architecture, which holds the promise of evaluation of novel myocardial therapy such as regenerative-based treatments. Despite the strong biological connection between diffusion CMR and myocardial fibrosis, in vivo diffusion CMR currently is not widely used in a clinical setting because of the major technical limitations of the technique which includes (i) bulk motion artifacts, (ii) distortion/susceptibility artifacts, (iii) limited spatial resolution (58mm3), (iv) limited spatial coverage, (v) long scan times (>20min), and (vi) low signal-to-noise ratio. Among the major technical challenges listed above for diffusion CMR, the greatest challenge is overcoming bulk motion because it is fundamentally tied to diffusion encoding. This dissertation aims to address some of these technical challenges to ultimately yield a clinically translatable in vivo diffusion CMR technique.To address challenges (i), (ii), (iii), and (v), a novel diffusion encoding strategy (M2 gradient moment nulling) was developed in conjunction with a unique diffusion acquisition approach (diffusion preparation) allowing for 3D multi-shot readouts. The two developed technologies were initially demonstrated in healthy subjects to reproducibly yield diffusion-weighted images (DWI) free of motion artifacts and comparable estimates of apparent diffusion coefficients (ADC) when compared to conventional diffusion sequences.The novel diffusion CMR sequence was then applied in a pre-clinical setting testing its ability to detect and characterize myocardial fibrosis in a chronic MI porcine animal model. The chronic MI porcine model acted as an excellent test scenario since myocardial fibrotic tissue in this model also has…
Subjects/Keywords: Biomedical engineering; Cardiovascular MRI; Clinical Translation; Diffusion MRI; Gradient Moment Nulling; Microstructural Characterization; Motion Compensation
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APA (6th Edition):
Nguyen, C. T. (2015). Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/8397m84g
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nguyen, Christopher Tam. “Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure.” 2015. Thesis, UCLA. Accessed December 05, 2019.
http://www.escholarship.org/uc/item/8397m84g.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nguyen, Christopher Tam. “Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure.” 2015. Web. 05 Dec 2019.
Vancouver:
Nguyen CT. Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure. [Internet] [Thesis]. UCLA; 2015. [cited 2019 Dec 05].
Available from: http://www.escholarship.org/uc/item/8397m84g.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nguyen CT. Clinical Translation of Diffusion Cardiac Magnetic Resonance Imaging: Motion Robust In Vivo Characterization of Myocardial Tissue Microstructure. [Thesis]. UCLA; 2015. Available from: http://www.escholarship.org/uc/item/8397m84g
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Surrey
24.
Rambaruth, Ratna.
Region-based video compression.
Degree: PhD, 1999, University of Surrey
URL: http://epubs.surrey.ac.uk/843377/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310712
► First generation image coding standards are now well-established and coders based on these standards are commercially available. However, for emerging applications, good quality at even…
(more)
▼ First generation image coding standards are now well-established and coders based on these standards are commercially available. However, for emerging applications, good quality at even lower bitrates is required. Ways of exploiting higher level visual information are currently being explored by the research community in order to achieve high compression. Unfortunately very high level approaches are bound to be restrictive as they are highly dependent on the accuracy of lower-level vision operations. Region-based coding only relies on mid-level image processing and thus is viewed as a promising strategy. In this work, substantial advances to the field of region-based video compression are made by considering the complete scheme. Thus, improvements to the failure regions coding and the motion compensation components have been devised. The failure region coding component was improved by predicting the texture inside the failure region from the neighbourhood of the region. A significant gain over widely used techniques such as the SA-DCT was obtained. The accuracy of the motion compensation component was increased by keeping an accurate internal representation for each region both at the encoder and the decoder side. The proposed region-based coding system is also evaluated against other systems, including the MPEG4 codec which has been recently approved by the MPEG community.
Subjects/Keywords: 621.3994; Image coding; Motion segmentation; compensation
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APA (6th Edition):
Rambaruth, R. (1999). Region-based video compression. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/843377/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310712
Chicago Manual of Style (16th Edition):
Rambaruth, Ratna. “Region-based video compression.” 1999. Doctoral Dissertation, University of Surrey. Accessed December 05, 2019.
http://epubs.surrey.ac.uk/843377/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310712.
MLA Handbook (7th Edition):
Rambaruth, Ratna. “Region-based video compression.” 1999. Web. 05 Dec 2019.
Vancouver:
Rambaruth R. Region-based video compression. [Internet] [Doctoral dissertation]. University of Surrey; 1999. [cited 2019 Dec 05].
Available from: http://epubs.surrey.ac.uk/843377/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310712.
Council of Science Editors:
Rambaruth R. Region-based video compression. [Doctoral Dissertation]. University of Surrey; 1999. Available from: http://epubs.surrey.ac.uk/843377/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310712
Mississippi State University
25.
Cui, Suxia.
MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN.
Degree: PhD, Electrical and Computer Engineering, 2003, Mississippi State University
URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-170057/
;
► Despite being the prefered approach for still-image compression for nearly a decade, wavelet-based coding for video has been slow to emerge, due primarily to the…
(more)
▼ Despite being the prefered approach for still-image compression for nearly a decade, wavelet-based coding for video has been slow to emerge, due primarily to the fact that the shift variance of the discrete wavelet transform hinders
motion estimation and
compensation crucial to modern video coders. Recently it has been recognized that a redundant, or overcomplete, wavelet transform is shift invariant and thus permits
motion prediction in the wavelet domain.
In this dissertation, other uses for the redundancy of overcomplete wavelet transforms in video coding are explored. First, it is demonstrated that the redundant-wavelet domain facilitates the placement of an irregular triangular mesh to video images, thereby exploiting transform redundancy to implement geometries for
motion estimation and
compensation more general than the traditional block structure widely employed. As the second contribution of this dissertation, a new form of multihypothesis prediction, redundant wavelet multihypothesis, is presented. This new approach to
motion estimation and
compensation produces
motion predictions that are diverse in transform phase to increase prediction accuracy. Finally, it is demonstrated that the proposed redundant-wavelet strategies complement existing advanced video-coding techniques and produce significant performance improvements in a battery of experimental results.
Advisors/Committee Members: Robert J. Moorhead (committee member), James E. Fowler (chair), Nicholas H. Younan (committee member), Thomas Philip (committee member).
Subjects/Keywords: video coding; motion estimation and motion compensation; multihypothesis motion compensation; irregular triangle mesh; redundant discrete wavelet transform
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APA (6th Edition):
Cui, S. (2003). MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-170057/ ;
Chicago Manual of Style (16th Edition):
Cui, Suxia. “MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN.” 2003. Doctoral Dissertation, Mississippi State University. Accessed December 05, 2019.
http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-170057/ ;.
MLA Handbook (7th Edition):
Cui, Suxia. “MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN.” 2003. Web. 05 Dec 2019.
Vancouver:
Cui S. MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN. [Internet] [Doctoral dissertation]. Mississippi State University; 2003. [cited 2019 Dec 05].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-170057/ ;.
Council of Science Editors:
Cui S. MOTION ESTIMATION AND COMPENSATION IN THE REDUNDANT WAVELET DOMAIN. [Doctoral Dissertation]. Mississippi State University; 2003. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07242003-170057/ ;
Indian Institute of Science
26.
Rath, Gagan Bihari.
Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.
Degree: 1999, Indian Institute of Science
URL: http://hdl.handle.net/2005/1674
Subjects/Keywords: Video Compression; Image Compression; Block Matching Algorithm; Motion Vector Coding; Motion Vectors; Block Based Motion Compensation; Global Motion Compensation; Motion Fields; Computer Science
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APA (6th Edition):
Rath, G. B. (1999). Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1674
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rath, Gagan Bihari. “Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.” 1999. Thesis, Indian Institute of Science. Accessed December 05, 2019.
http://hdl.handle.net/2005/1674.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rath, Gagan Bihari. “Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.” 1999. Web. 05 Dec 2019.
Vancouver:
Rath GB. Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. [Internet] [Thesis]. Indian Institute of Science; 1999. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2005/1674.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rath GB. Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. [Thesis]. Indian Institute of Science; 1999. Available from: http://hdl.handle.net/2005/1674
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
27.
Rath, Gagan Bihari.
Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.
Degree: 1999, Indian Institute of Science
URL: http://etd.iisc.ernet.in/handle/2005/1674
;
http://etd.ncsi.iisc.ernet.in/abstracts/2165/G15570-Abs.pdf
Subjects/Keywords: Video Compression; Image Compression; Block Matching Algorithm; Motion Vector Coding; Motion Vectors; Block Based Motion Compensation; Global Motion Compensation; Motion Fields; Computer Science
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Rath, G. B. (1999). Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/1674 ; http://etd.ncsi.iisc.ernet.in/abstracts/2165/G15570-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rath, Gagan Bihari. “Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.” 1999. Thesis, Indian Institute of Science. Accessed December 05, 2019.
http://etd.iisc.ernet.in/handle/2005/1674 ; http://etd.ncsi.iisc.ernet.in/abstracts/2165/G15570-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rath, Gagan Bihari. “Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression.” 1999. Web. 05 Dec 2019.
Vancouver:
Rath GB. Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. [Internet] [Thesis]. Indian Institute of Science; 1999. [cited 2019 Dec 05].
Available from: http://etd.iisc.ernet.in/handle/2005/1674 ; http://etd.ncsi.iisc.ernet.in/abstracts/2165/G15570-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rath GB. Some New Approaches To Block Based Motion Estimation And Compensation For Video Compression. [Thesis]. Indian Institute of Science; 1999. Available from: http://etd.iisc.ernet.in/handle/2005/1674 ; http://etd.ncsi.iisc.ernet.in/abstracts/2165/G15570-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Sul
28.
Silva, Jonas dos Santos.
Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD.
Degree: 2013, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/96500
► Uma sequencia de vídeo pode ser adquirida de forma progressiva ou entrelaçada. No padrão de codificação de vídeo H.264/AVC os campos de uma imagem entrelaçada…
(more)
▼ Uma sequencia de vídeo pode ser adquirida de forma progressiva ou entrelaçada. No padrão de codificação de vídeo H.264/AVC os campos de uma imagem entrelaçada podem ser codificados em modo frame (campos top e bottom entrelaçados) ou em modo field (campos top e bottom agrupados separadamente). Quando a escolha é adaptativa para cada par de macro blocos a codificação é chamada de Macroblock Adaptive Frame- Field (MBAFF). Inovações na predição inter-quadro do H.264/AVC contribuíram significantemente para a performance do padrão alcançar o dobro da taxa de compressão do seu antecessor (ITU, 1994), ao custo de um grande aumento de complexidade computacional do CODEC. Dentro da predição inter-quadro, o bloco de compensação de movimento (MC) é responsável pela reconstrução de um bloco de pixels. No decodificador apresentado em (BONATTO, 2012) está integrada uma solução em hardware para o MC que suporta a maior parte do conjunto de ferramentas do perfil Main do H.264/AVC. A compensação de movimento pode ser dividida em predição de vetores e processamento de amostras. No processamento de amostras é realizada a interpolação e a ponderação de amostras. O módulo de ponderação de amostras, ou predição ponderada, utiliza fatores de escala para escalonar as amostras na saída do MC. Isso é muito útil quando há esvanecimento no vídeo. Inicialmente este trabalho apresenta um estudo do processo de compensação de movimento, segundo o padrão de codificação de vídeo H.264/AVC. São abordadas todas as ferramentas da predição inter-quadro, incluindo o tratamento de vídeo entrelaçado e todos os possíveis modos de codificação para o mesmo. A seguir é apresentada uma arquitetura em hardware para a predição ponderada do MC. Esta arquitetura atende o perfil main do H.264/AVC, que prevê a decodificação de imagens frame, field ou MBAFF. A arquitetura apresentada é baseada no compensador de movimento contido no decodificador apresentado em (BONATTO, 2012), que não tem suporte a predição ponderada e a vídeo entrelaçado. A arquitetura proposta é composta por dois módulos: Scale Factor Prediction (SFP) e Weighted Samples Prediction (WSP) . A arquitetura foi desenvolvida em linguagem VHDL e a simulação temporal mostrou que a mesma pode decodificar imagens MBAFF em tempo real @60i. Dessa forma, tornando-se uma ferramenta muito útil ao desenvolvimento de sistemas de codificação e decodificação em HW. Não foi encontrada, na literatura atual, uma solução em hardware para compensação de movimento do padrão H.264/AVC com suporte a codificação MBAFF.
A video sequence can be acquired in a progressive or interlaced mode. In the video coding H.264/AVC standard an interlaced picture can be encoded in frame mode (top and bottom fields interlaced) or field mode (top and bottom fields combined separately). When the choice for each pair of macro-blocks coding is adaptive, it is called Macroblock Adaptive Frame-Field (MBAFF). The innovations in the inter-frame prediction of H.264/AVC contributed significantly to the performance of the standard that achieved twice…
Advisors/Committee Members: Susin, Altamiro Amadeu.
Subjects/Keywords: H264/AVC; Televisão digital; Processamento de imagens; MBAFF; Hardware; Inter-frame prediction; Motion compensation; Samples processing; Weighted prediction; VHDL; Hardware
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APA ·
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APA (6th Edition):
Silva, J. d. S. (2013). Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/96500
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Silva, Jonas dos Santos. “Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD.” 2013. Thesis, Universidade do Rio Grande do Sul. Accessed December 05, 2019.
http://hdl.handle.net/10183/96500.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Silva, Jonas dos Santos. “Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD.” 2013. Web. 05 Dec 2019.
Vancouver:
Silva JdS. Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2013. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10183/96500.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Silva JdS. Implementação da compensação de movimento em vídeo entrelaçado no terminal de acesso do SBTVD. [Thesis]. Universidade do Rio Grande do Sul; 2013. Available from: http://hdl.handle.net/10183/96500
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
Rozantsev, Artem.
Vision-based detection of aircrafts and UAVs.
Degree: 2017, EPFL
URL: http://infoscience.epfl.ch/record/227934
► Unmanned Aerial Vehicles are becoming increasingly popular for a broad variety of tasks ranging from aerial imagery to objects delivery. With the expansion of the…
(more)
▼ Unmanned Aerial Vehicles are becoming increasingly popular for a broad variety of tasks ranging from aerial imagery to objects delivery. With the expansion of the areas, where drones can be efficiently used, the collision risk with other flying objects increases. Avoiding such collisions would be a relatively easy task, if all the aircrafts in the neighboring airspace could communicate with each other and share their location information. However, it is often the case that either location information is unavailable (e.g. flying in GPS-denied environments) or communication is not possible (e.g. different communication channels or non-cooperative flight scenario). To ensure flight safety in this kind of situations drones need a way to autonomously detect other objects that are intruding the neighboring airspace. Visual-based collision avoidance is of particular interest as cameras generally consume less power and are more lightweight than active sensor alternatives such as radars and lasers. We have therefore developed a set of increasingly sophisticated algorithms to provide drones with a visual collision avoidance capability. First, we present a novel method for detecting flying objects such as drones and planes that occupy a small part of the camera field of view, possibly move in front of complex backgrounds, and are filmed by a moving camera. In order to be solved this problem requires combining
motion and appearance information, as neither of the two alone is capable of providing reliable enough detections. We therefore propose a machine learning technique that operates on spatio- temporal cubes of image intensities where individual patches are aligned using an object-centric regression-based
motion stabilization algorithm. Second, in order to reduce the need to collect a large training dataset and to manual annotate it, we introduce a way to generate realistic synthetic images. Given only a small set of real examples and a coarse 3D model of the object, synthetic data can be generated in arbitrary quantities and further used to supplement real examples for training a detector. The key ingredient of our method is that the synthetically generated images need to be as close as possible to the real ones not in terms of image quality, but according to the features, used by a machine learning algorithm. Third, though the aforementioned approach yields a substantial increase in performance when using Adaboost and DPM detectors, it does not generalize well to Convolutional Neural Networks, which have become the state-of-the-art. This happens because, as we add more and more synthetic data, the CNNs begin to overfit to the synthetic images at the expense of the real ones. We therefore propose a novel deep domain adaptation technique that allows efficiently combining real and synthetic images without overfitting to either of the two. While most of the adaptation techniques aim at learning features that are invariant to the possible difference of the images, coming from different sources (real and synthetic).…
Advisors/Committee Members: Fua, Pascal, Lepetit, Vincent.
Subjects/Keywords: computer vision; unmanned aerial vehicles; object detection; motion compensation; synthetic data generation; machine learning; deep learning; domain adaptation
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APA (6th Edition):
Rozantsev, A. (2017). Vision-based detection of aircrafts and UAVs. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/227934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rozantsev, Artem. “Vision-based detection of aircrafts and UAVs.” 2017. Thesis, EPFL. Accessed December 05, 2019.
http://infoscience.epfl.ch/record/227934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rozantsev, Artem. “Vision-based detection of aircrafts and UAVs.” 2017. Web. 05 Dec 2019.
Vancouver:
Rozantsev A. Vision-based detection of aircrafts and UAVs. [Internet] [Thesis]. EPFL; 2017. [cited 2019 Dec 05].
Available from: http://infoscience.epfl.ch/record/227934.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rozantsev A. Vision-based detection of aircrafts and UAVs. [Thesis]. EPFL; 2017. Available from: http://infoscience.epfl.ch/record/227934
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Harvard University
30.
Kesner, Samuel Benjamin.
Robotic Catheters for Beating Heart Surgery.
Degree: PhD, Engineering Sciences, 2011, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10033920
► Compliant and flexible cardiac catheters provide direct access to the inside of the heart via the vascular system without requiring clinicians to stop the heart…
(more)
▼ Compliant and flexible cardiac catheters provide direct access to the inside of the heart via the vascular system without requiring clinicians to stop the heart or open the chest. However, the fast motion of the intracardiac structures makes it difficult to modify and repair the cardiac tissue in a controlled and safe manner. In addition, rigid robotic tools for beating heart surgery require the chest to be opened and the heart exposed, making the procedures highly invasive. The novel robotic catheter system presented here enables minimally invasive repair on the fast-moving structures inside the heart, like the mitral valve annulus, without the invasiveness or risks of stopped heart procedures. In this thesis, I investigate the development of 3D ultrasound-guided robotic catheters for beating heart surgery. First, the force and stiffness values of tissue structures in the left atrium are measured to develop design requirements for the system. This research shows that a catheter will experience contractile forces of 0.5 – 1.0 N and a mean tissue structure stiffness of approximately 0.1 N/mm while interacting with the mitral valve annulus. Next, this thesis presents the catheter system design, including force sensing, tissue resection, and ablation end effectors. In order to operate inside the beating heart, position and force control systems were developed to compensate for the catheter performance limitations of friction and deadzone backlash and evaluated with ex vivo and in vivo experiments. Through the addition of friction and deadzone compensation terms, the system is able to achieve position tracking with less than 1 mm RMS error and force tracking with 0.08 N RMS error under ultrasound image guidance. Finally, this thesis examines how the robotic catheter system enhances beating heart clinical procedures. Specifically, this system improves resection quality while reducing the forces experienced by the tissue by almost 80% and improves ablation performance by reducing contact resistance variations by 97% while applying a constant force on the moving tissue.
Engineering and Applied Sciences
Advisors/Committee Members: Howe, Robert D. (advisor), Wood, Robert (committee member), Slocum, Alexander (committee member), Dupont, Pierre (committee member).
Subjects/Keywords: robotics; biomedical engineering; mechanical engineering; cardiac surgery; mechanical design; medical robotics; motion compensation; robotic control; robotic catheters
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APA (6th Edition):
Kesner, S. B. (2011). Robotic Catheters for Beating Heart Surgery. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:10033920
Chicago Manual of Style (16th Edition):
Kesner, Samuel Benjamin. “Robotic Catheters for Beating Heart Surgery.” 2011. Doctoral Dissertation, Harvard University. Accessed December 05, 2019.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:10033920.
MLA Handbook (7th Edition):
Kesner, Samuel Benjamin. “Robotic Catheters for Beating Heart Surgery.” 2011. Web. 05 Dec 2019.
Vancouver:
Kesner SB. Robotic Catheters for Beating Heart Surgery. [Internet] [Doctoral dissertation]. Harvard University; 2011. [cited 2019 Dec 05].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10033920.
Council of Science Editors:
Kesner SB. Robotic Catheters for Beating Heart Surgery. [Doctoral Dissertation]. Harvard University; 2011. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10033920
◁ [1] [2] [3] ▶
. 
Open Access Theses and Dissertations
