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Universiteit Utrecht
1.
Hoef, M. van de.
Real-Time Dynamic Radiosity for High Quality Global Illumination.
Degree: 2014, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/288879 
► The radiosity class of techniques is relatively underrepresented in the current studies towards real-time dynamic global illumination, while it provides unique advantages. This thesis builds…
(more)
▼ The radiosity class of techniques is relatively underrepresented in the current studies towards real-time dynamic global
illumination, while it provides unique advantages. This thesis builds upon the existing theory for the redistribution of radiosity and the existing progressive refinement adaptation for graphics hardware.
The dynamic radiosity theory is expanded by this thesis to differentiate between types of redistribution based on the emitting or receiving role of the static and dynamic patches. The new theory grounds the proposed cross redistribution radiosity algorithm. The redistribution of radiosity originating from static patches is substituted by different types of redistribution. The advantage of this new technique is that the number of rendered hemicubes no longer depends on the number of static patches but only on the number of dynamic patches, which proves to be a significant performance increase. The novel cross projection function is essential for realizing the reduction of rendered hemicubes.
Several hardware accelerated radiosity adaptations are developed for comparison. The hardware accelerated adaptation of the progressive refinement algorithm is improved significantly, focusing on quality and general applicability. Furthermore, a novel hardware accelerated adaptation of incremental radiosity is introduced, which introduces the concept of reshooting. Finally, the cross redistribution radiosity theory is supplemented with a fast hardware accelerated adaptation, with the cross projection adaptation as main innovation.
A qualitative analysis demonstrates that all implementations are capable of delivering very high quality global
illumination, although the scene properties are restricted. In certain situations cross redistribution radiosity generates artifacts due to undersampling. The execution time is benchmarked for all implementations, which proves that the cross redistribution radiosity adaptation performs well within real-time bounds. A comparative analysis of competing real-time high quality global
illumination techniques is favorable to our cross redistribution radiosity method, within the imposed scene restrictions.
Advisors/Committee Members: Hürst, W.O..
Subjects/Keywords: global illumination; real-time; radiosity; illumination
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APA (6th Edition):
Hoef, M. v. d. (2014). Real-Time Dynamic Radiosity for High Quality Global Illumination. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/288879
Chicago Manual of Style (16th Edition):
Hoef, M van de. “Real-Time Dynamic Radiosity for High Quality Global Illumination.” 2014. Masters Thesis, Universiteit Utrecht. Accessed April 10, 2021.
http://dspace.library.uu.nl:8080/handle/1874/288879.
MLA Handbook (7th Edition):
Hoef, M van de. “Real-Time Dynamic Radiosity for High Quality Global Illumination.” 2014. Web. 10 Apr 2021.
Vancouver:
Hoef Mvd. Real-Time Dynamic Radiosity for High Quality Global Illumination. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2021 Apr 10].
Available from: http://dspace.library.uu.nl:8080/handle/1874/288879.
Council of Science Editors:
Hoef Mvd. Real-Time Dynamic Radiosity for High Quality Global Illumination. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/288879
Victoria University of Wellington
2.
Roughton, Thomas.
Interactive Generation of Path-Traced Lightmaps.
Degree: 2019, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8492
► Indirect illumination is an important part of realistic images, and accurately simulating the complex effects of indirect illumination in real-time applications has long been a…
(more)
▼ Indirect
illumination is an important part of realistic images, and accurately simulating the complex effects of indirect
illumination in real-time applications has long been a challenge for the industry. One popular approach is to use offline precomputed solutions such as lightmaps (textures containing the precomputed lighting in a scene) to efficiently approximate these effects. Unfortunately, these offline solutions have historically enforced long iteration times that come at a cost to artist productivity. These solutions have additionally either supported only the low-frequency diffuse component of indirect lighting, yielding poor visual results for glossy or metallic materials, or have used overly expensive approximations.
In recent years, the state of the art lightmap precomputation pipeline has shifted to using highly vectorised path tracing, often on GPU hardware, to compute the indirect
illumination effects. The use of path tracing enables progressive rendering, wherein an approximation to the full solution is found and then refined as opposed to solving for the final result in a single step. Progressive rendering through path tracing thereby helps to provide rapid iteration for artists.
This thesis describes a system that can progressively path-trace indirect
illumination lightmaps on the GPU.Contributing to this system, itintroduces a new gather-based method for sample accumulation, enhances algorithms from prior work, and presents a range of encoding methods, including a novel progressive method for non-negative least-squares encoding of spherical basis functions.
In addition, it presents a novel, efficient solution for high-quality precomputed diffuse and low-frequency specular indirect
illumination that extends the Ambient Dice family of spherical basis functions. This solution provides comparable or better specular reconstruction to prior work at lower runtime cost and has potential for widespread use in real-time applications.
Advisors/Committee Members: Rhee, Taehyun, Chalmers, Andrew.
Subjects/Keywords: Indirect illumination; Rendering; Path tracing; Global illumination
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APA (6th Edition):
Roughton, T. (2019). Interactive Generation of Path-Traced Lightmaps. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8492
Chicago Manual of Style (16th Edition):
Roughton, Thomas. “Interactive Generation of Path-Traced Lightmaps.” 2019. Masters Thesis, Victoria University of Wellington. Accessed April 10, 2021.
http://hdl.handle.net/10063/8492.
MLA Handbook (7th Edition):
Roughton, Thomas. “Interactive Generation of Path-Traced Lightmaps.” 2019. Web. 10 Apr 2021.
Vancouver:
Roughton T. Interactive Generation of Path-Traced Lightmaps. [Internet] [Masters thesis]. Victoria University of Wellington; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10063/8492.
Council of Science Editors:
Roughton T. Interactive Generation of Path-Traced Lightmaps. [Masters Thesis]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8492
University of Utah
3.
Loos, Bradford J.
Modular radiance transfer.
Degree: PhD, Computing (School of), 2015, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3730/rec/1617
► Real-time global illumination is the next frontier in real-time rendering. In an attempt to generate realistic images, games have followed the film industry into physically…
(more)
▼ Real-time global illumination is the next frontier in real-time rendering. In an attempt to generate realistic images, games have followed the film industry into physically based shading and will soon begin integrating global illumination techniques. Traditional methods require too much memory and too much time to compute for real-time use. With Modular and Delta Radiance Transfer we precompute a scene-independent, low-frequency basis that allows us to calculate complex indirect lighting calculations in a much lower dimensional subspace with a reduced memory footprint and real-time execution. The results are then applied as a light map on many different scenes. To improve the low frequency results, we also introduce a novel screen space ambient occlusion technique that allows us to generate a smoother result with fewer samples. These three techniques, low and high frequency used together, provide a viable indirect lighting solution that can be run in milliseconds on today's hardware, providing a useful new technique for indirect lighting in real-time graphics.
Subjects/Keywords: Global illumination; Graphics
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APA (6th Edition):
Loos, B. J. (2015). Modular radiance transfer. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3730/rec/1617
Chicago Manual of Style (16th Edition):
Loos, Bradford J. “Modular radiance transfer.” 2015. Doctoral Dissertation, University of Utah. Accessed April 10, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3730/rec/1617.
MLA Handbook (7th Edition):
Loos, Bradford J. “Modular radiance transfer.” 2015. Web. 10 Apr 2021.
Vancouver:
Loos BJ. Modular radiance transfer. [Internet] [Doctoral dissertation]. University of Utah; 2015. [cited 2021 Apr 10].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3730/rec/1617.
Council of Science Editors:
Loos BJ. Modular radiance transfer. [Doctoral Dissertation]. University of Utah; 2015. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3730/rec/1617
Cornell University
4.
Velazquez Armendariz, Edgar.
Complex Luminaires: Illumination And Appearance Rendering.
Degree: PhD, Computer Science, 2014, Cornell University
URL: http://hdl.handle.net/1813/38809
► Simulating a complex luminaire is expensive and slow, even using state-ofthe-art algorithms. A more practical alternative is to use precomputation to accelerate rendering. Prior approaches…
(more)
▼ Simulating a complex luminaire is expensive and slow, even using state-ofthe-art algorithms. A more practical alternative is to use precomputation to accelerate rendering. Prior approaches cached information on an aperture surface that separates the luminaire from the scene, but many luminaires have large or ill-defined apertures leading to excessive data storage and inaccurate results. In this dissertation, we separate luminaire rendering into
illumination and appearance components. A precomputation stage simulates the complex light flow inside the luminaire to generate two data structures: a set of anisotropic point lights (APLs) and a radiance volume. The APLs are located near apparent sources and represent the light leaving the luminaire, allowing its near- and farfield
illumination to be accurately and efficiently computed at render time. The luminaire's appearance consists of high- and low-frequency components which are both visually important. High-frequency components are computed dynamically at render time, while the more computationally expensive, low-frequency components are approximated using the precomputed radiance volume. Results are shown for several complex luminaires, demonstrating orders of magnitude faster rendering compared to the best global
illumination algorithms and higher fidelity with greatly reduced storage requirements compared to previous precomputed approaches.
Advisors/Committee Members: Greenberg, Donald P (chair), Van Loan, Charles Francis (committee member), Weatherspoon, Hakim (committee member).
Subjects/Keywords: Luminaires; Illumination; Rendering
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APA (6th Edition):
Velazquez Armendariz, E. (2014). Complex Luminaires: Illumination And Appearance Rendering. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/38809
Chicago Manual of Style (16th Edition):
Velazquez Armendariz, Edgar. “Complex Luminaires: Illumination And Appearance Rendering.” 2014. Doctoral Dissertation, Cornell University. Accessed April 10, 2021.
http://hdl.handle.net/1813/38809.
MLA Handbook (7th Edition):
Velazquez Armendariz, Edgar. “Complex Luminaires: Illumination And Appearance Rendering.” 2014. Web. 10 Apr 2021.
Vancouver:
Velazquez Armendariz E. Complex Luminaires: Illumination And Appearance Rendering. [Internet] [Doctoral dissertation]. Cornell University; 2014. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1813/38809.
Council of Science Editors:
Velazquez Armendariz E. Complex Luminaires: Illumination And Appearance Rendering. [Doctoral Dissertation]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/38809
Rochester Institute of Technology
5.
Johnson, Jim.
5 Photographs.
Degree: School of Photographic Arts and Sciences (CIAS), 2002, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/5262
Subjects/Keywords: Illumination; Photography
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APA (6th Edition):
Johnson, J. (2002). 5 Photographs. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5262
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):
Johnson, Jim. “5 Photographs.” 2002. Thesis, Rochester Institute of Technology. Accessed April 10, 2021.
https://scholarworks.rit.edu/theses/5262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Johnson, Jim. “5 Photographs.” 2002. Web. 10 Apr 2021.
Vancouver:
Johnson J. 5 Photographs. [Internet] [Thesis]. Rochester Institute of Technology; 2002. [cited 2021 Apr 10].
Available from: https://scholarworks.rit.edu/theses/5262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Johnson J. 5 Photographs. [Thesis]. Rochester Institute of Technology; 2002. Available from: https://scholarworks.rit.edu/theses/5262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
6.
Hoet, M.M.H.
Indirect illumination using photon splatting.
Degree: 2014, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/301235
► Indirect illumination algorithms exist in many forms, but the state-of-the-art real-time algorithms often limit the rendering equation in terms of visibility determination or leave it…
(more)
▼ Indirect
illumination algorithms exist in many forms, but the state-of-the-art real-time algorithms often limit the rendering equation in terms of visibility determination or leave it out completely. The main focus of this thesis is to adapt the existing high quality photon mapping method in order to make the visibility determination closer to the real-time field. Similar to the splatting indirect
illumination technique, our technique works by placing many indirect light sources in the scene. However, we consider these light sources as small orthographic area light sources instead of point light sources. This allows us to introduce a novel technique for visibility determination. This technique bundles light rays into a single ray for a more efficient, but still plausible, indirect
illumination if many samples are averaged. The final
illumination is then applied by splatting this single ray using an orthographic shadow map that serves as a local visibility determination for the entire bundle. Furthermore, we introduce a new technique for stratifying these light sources in 3D space.
A highly parameterized version of this algorithm was implemented, as well as a photon mapping implementation to serve as a ground truth. Both algorithms are assessed in terms of quality, resources and speed. Our result show an improvement in rendering time with minor loss of quality, although the time required for our algorithm to converge is still far out of the real-time range. However, our techniques have been concocted keeping hardware acceleration in mind. Such implementation might show promising results.
Advisors/Committee Members: Wand, M., Hoef, M. van de.
Subjects/Keywords: graphics; global illumination; photon mapping
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APA (6th Edition):
Hoet, M. M. H. (2014). Indirect illumination using photon splatting. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/301235
Chicago Manual of Style (16th Edition):
Hoet, M M H. “Indirect illumination using photon splatting.” 2014. Masters Thesis, Universiteit Utrecht. Accessed April 10, 2021.
http://dspace.library.uu.nl:8080/handle/1874/301235.
MLA Handbook (7th Edition):
Hoet, M M H. “Indirect illumination using photon splatting.” 2014. Web. 10 Apr 2021.
Vancouver:
Hoet MMH. Indirect illumination using photon splatting. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2021 Apr 10].
Available from: http://dspace.library.uu.nl:8080/handle/1874/301235.
Council of Science Editors:
Hoet MMH. Indirect illumination using photon splatting. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/301235
Cornell University
7.
Knowlton, Daniel.
Physically-Based Cloudy Sky Illumination.
Degree: M.S., Architectural Science, Architectural Science, 2015, Cornell University
URL: http://hdl.handle.net/1813/40916
► We present a hybrid method combining both weather data and ground-based photography to generate physically-based full hemisphere cloudy sky illumination. We validate our illumination model…
(more)
▼ We present a hybrid method combining both weather data and ground-based photography to generate physically-based full hemisphere cloudy sky
illumination. We validate our
illumination model using precise spatial and spectral radiance and total irradiance measurements of cloudy skies gathered over the timespan of several months using custom-built hardware. Our system reconstructs cloud volumes from fish-eye photographs utilizing satellite data to bound the vertical and horizontal extent of the cloud geometry. We estimate optical parameters for the cloud volumes from measured cloud micro-physical properties gathered from weather data. When combined with a physically-based light transport algorithm, our cloud
illumination model accurately reproduces the highly varying anisotropic structure of a cloudy sky. In contrast to purely image-based techniques which produce static RGB
illumination maps, by generating an actual cloud volume our method efficiently handles changes in sun direction, viewing angle, and cloud geometry. Our approach can accurately simulate a wide range of cloud and weather conditions and has applications for physically-based rendering, daylighting studies, and scene
illumination.
Advisors/Committee Members: Greenberg,Donald P (chair), Philpot,William Douglas (committee member).
Subjects/Keywords: scene illumination; physically-based; clouds
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APA (6th Edition):
Knowlton, D. (2015). Physically-Based Cloudy Sky Illumination. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/40916
Chicago Manual of Style (16th Edition):
Knowlton, Daniel. “Physically-Based Cloudy Sky Illumination.” 2015. Masters Thesis, Cornell University. Accessed April 10, 2021.
http://hdl.handle.net/1813/40916.
MLA Handbook (7th Edition):
Knowlton, Daniel. “Physically-Based Cloudy Sky Illumination.” 2015. Web. 10 Apr 2021.
Vancouver:
Knowlton D. Physically-Based Cloudy Sky Illumination. [Internet] [Masters thesis]. Cornell University; 2015. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1813/40916.
Council of Science Editors:
Knowlton D. Physically-Based Cloudy Sky Illumination. [Masters Thesis]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40916
Texas A&M University
8.
Wang, Youyou.
Qualitative Global Illumination of Mock-3D Scenes.
Degree: PhD, Computer Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/157921
► In this work, we developed a framework to obtain qualitatively acceptable global rendering effects without an explicit geometry. This framework is particularly useful for 2D…
(more)
▼ In this work, we developed a framework to obtain qualitatively acceptable global rendering effects without an explicit geometry. This framework is particularly useful for 2D artists such as painters and illustrators. They will be able to obtain 3D looking images with complete artistic control as if they are using a 2D digital image manipulation system.
The core of this approach is a mock-3D scene representation that allows impossible or stylized shapes as “fuzzy” geometric structures. These fuzzy geometric structures are view dependent shapes that are computed from texture maps which provide normal, thickness and displacement information for all visible points of a shape. The information that is provided by these texture maps, which we call shape maps, do not have to be complete or consistent. Shape maps can be obtaining by (1) converting 3D shapes into 2D images, (2) modeling using a sketch based interface, (3) directly painting a gradient domain image or (4) photographing real objects. The most interesting shape maps are those sketched or painted by an artist, since they can reflect the artist’s intention, even if this does not follow the normal rules of perspective.
The major advantage of this approach is the ability to obtain visually acceptable global effects even when shape maps do not correspond to real 3D shapes. We show that computing view dependent fuzzy geometry from shape maps is sufficient to obtain qualitatively convincing global
illumination effects even for impossible shapes. The methods we have developed and implemented for global rendering effects include ambient occlusion, local and global shadows, refraction and reflection. Although these methods do not directly correspond to underlying physical phenomena, they ii can provide results that are qualitative proportional to 3D realistic rendering.
Our approach is a very 2D artist-friendly representation since the shaders are also defined as images. These images can naturally describe shading parameters and provide a simple 2D control of the shading and rendering processes to intuitively obtain desired visual results. In particular, this representational power helps to easily obtain a wide variety of NPR effects that is still consistent with global
illumination.
Advisors/Committee Members: Akleman, Ergun (advisor), Song, Dezhen (advisor), Schaefer, Scott (committee member), Keyser, John (committee member).
Subjects/Keywords: Qualitative Rendering; Global Illumination
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APA (6th Edition):
Wang, Y. (2014). Qualitative Global Illumination of Mock-3D Scenes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157921
Chicago Manual of Style (16th Edition):
Wang, Youyou. “Qualitative Global Illumination of Mock-3D Scenes.” 2014. Doctoral Dissertation, Texas A&M University. Accessed April 10, 2021.
http://hdl.handle.net/1969.1/157921.
MLA Handbook (7th Edition):
Wang, Youyou. “Qualitative Global Illumination of Mock-3D Scenes.” 2014. Web. 10 Apr 2021.
Vancouver:
Wang Y. Qualitative Global Illumination of Mock-3D Scenes. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1969.1/157921.
Council of Science Editors:
Wang Y. Qualitative Global Illumination of Mock-3D Scenes. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/157921
Dalhousie University
9.
Singh, Rahul.
STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE.
Degree: Master of Applied Science, Department of Electrical & Computer
Engineering, 2014, Dalhousie University
URL: http://hdl.handle.net/10222/55970
► Structured illumination microscopy (SIM) increases resolution of optical microscopes substantially. However, simulation of this process using mathematical models is still a novel notion. Purpose: To…
(more)
▼ Structured
illumination microscopy (SIM) increases
resolution of optical microscopes substantially. However,
simulation of this process using mathematical models is still a
novel notion. Purpose: To design a program to simulate the process
of SIM and study its application on biological samples. Method:
Pre-defined images of microscopic samples were blurred and then
reconstructed using a simulation designed in MATLAB. Experimental
application of SIM and simulated reconstruction of images obtained
using a microscope was then performed. Results: Considerably high
resolution images were obtained from the simulation, which was also
supported by the pixel intensity plots, signal to noise ratio and
peak signal to noise ratio analyses. Resolution of images of
samples obtained from experimentally performing SIM on a microscope
were also similar to their simulated reconstruction. Conclusion:
SIM is a desirable option for optimally imaging biological
microscopic samples, physically as well as through simulation
process.
Advisors/Committee Members: Dr. William Phillips (external-examiner), Dr. Sergey Ponomarenko (graduate-coordinator), Dr. Kamal El-Sankary (thesis-reader), Dr. Michael Cada (thesis-supervisor), Dr. Alan Fine (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: SIM; DMD; STRUCTURED ILLUMINATION; SUPERRESOLUTION
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APA (6th Edition):
Singh, R. (2014). STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/55970
Chicago Manual of Style (16th Edition):
Singh, Rahul. “STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE.” 2014. Masters Thesis, Dalhousie University. Accessed April 10, 2021.
http://hdl.handle.net/10222/55970.
MLA Handbook (7th Edition):
Singh, Rahul. “STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE.” 2014. Web. 10 Apr 2021.
Vancouver:
Singh R. STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE. [Internet] [Masters thesis]. Dalhousie University; 2014. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10222/55970.
Council of Science Editors:
Singh R. STRUCTURED ILLUMINATION MICROSCOPY USING DIGITAL MICROMIRROR
DEVICE. [Masters Thesis]. Dalhousie University; 2014. Available from: http://hdl.handle.net/10222/55970
Victoria University of Wellington
10.
Chalmers, Andrew.
Illumination Space: A Feature Space for Radiance Maps.
Degree: 2018, Victoria University of Wellington
URL: http://hdl.handle.net/10063/9100
► From red sunsets to blue skies, the natural world contains breathtaking scenery with complex lighting which many computer graphics applications strive to emulate. Achieving such…
(more)
▼ From red sunsets to blue skies, the natural world contains breathtaking scenery with complex lighting which many computer graphics applications strive to emulate. Achieving such realism is a computationally challenging task and requires proficiency with rendering software. To aid in this process, radiance maps (RM) are a convenient storage structure for representing the real-world. In this form, it can be used to realistically illuminate synthetic objects or for backdrop replacement in chroma key compositing. An artist can also freely change a RM to another that better matches their desired lighting or background conditions. This motivates the need for a large collection of RMs such that an artist has a range of environmental conditions to choose from. Due to the practicality of RMs, databases of RMs have continually grown since its inception. However, a comprehensive collection of RMs is not useful without a method for searching through the collection.
This thesis defines a semantic feature space that allows an artist to interactively browse through databases of RMs, with applications for both lighting and backdrop replacement in mind. The set of features are automatically extracted from the RMs in an offline pre-processing step, and are queried in real-time for browsing.
Illumination features are defined to concisely describe lighting properties of a RM, allowing an artist to find a RM to illuminate their target scene. Texture features are used to describe visual elements of a RM, allowing an artist to search the database for reflective or backdrop properties for their target scene. A combination of the two sets of features allows an artist to search for RMs with desirable
illumination effects which match the background environment.
Advisors/Committee Members: Rhee, Taehyun, Lewis, John.
Subjects/Keywords: Radiance map; Feature space; Illumination
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APA (6th Edition):
Chalmers, A. (2018). Illumination Space: A Feature Space for Radiance Maps. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/9100
Chicago Manual of Style (16th Edition):
Chalmers, Andrew. “Illumination Space: A Feature Space for Radiance Maps.” 2018. Doctoral Dissertation, Victoria University of Wellington. Accessed April 10, 2021.
http://hdl.handle.net/10063/9100.
MLA Handbook (7th Edition):
Chalmers, Andrew. “Illumination Space: A Feature Space for Radiance Maps.” 2018. Web. 10 Apr 2021.
Vancouver:
Chalmers A. Illumination Space: A Feature Space for Radiance Maps. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2018. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10063/9100.
Council of Science Editors:
Chalmers A. Illumination Space: A Feature Space for Radiance Maps. [Doctoral Dissertation]. Victoria University of Wellington; 2018. Available from: http://hdl.handle.net/10063/9100
Tampereen ammattikorkeakoulu
11.
Kontu, Juha.
3D-valaistuksen tekniikat.
Degree: 2014, Tampereen ammattikorkeakoulu
URL: http://www.theseus.fi/handle/10024/78257
► Tämä opinnäytetyö kertoo 3D-valaistuksesta, joka on yksi tärkeimmistä osa-alueista 3D-grafiikassa. Työssä on myös paljon kuvia, jotka on tehty helpottamaan asioiden ymmärtämistä. Oikeanlainen valaistus vaikuttaa paljon…
(more)
▼ Tämä opinnäytetyö kertoo 3D-valaistuksesta, joka on yksi tärkeimmistä osa-alueista 3D-grafiikassa. Työssä on myös paljon kuvia, jotka on tehty helpottamaan asioiden ymmärtämistä.
Oikeanlainen valaistus vaikuttaa paljon siihen, kuinka hyvältä ja realistiselta valmis 3D-kuva näyttää. Tarkoituksena on kertoa yleisesti 3D-mallien valaisemisesta eikä keskittyä mihinkään tiettyyn ohjelmaan. Opinnäytetyössä esitellään yleisimmät valotyypit ja kerrotaan niiden ominaisuuksista. Työssä käydään lävitse myös erilaiset varjotyypit ja varjoalgoritmit.
Kolmipistevalaisu on tunnetuin ja yleisin valaisutekniikka. Se on kuitenkin tekniikka, jonka ymmärrettyään voi ymmärtää muunkinlaisia valaisutekniikoita. Osiossa esitellään referenssikuvien avulla valot, jotka kuuluvat kolmipistevalaisuun. Tällä tavoin on helpompi ymmärtää, kuinka tekniikka toimii ja mikä on jokaisen yksittäisen valon tarkoitus.
Ilman oikeanlaista renderöintitekniikkaa on lähes mahdotonta saada 3D-kuvan valaistus näyttämään realistiselta ja uskottavalta. Oikeanlainen valojen käyttö ja niiden sijoittelu on erittäin tärkeää, mutta vähintään yhtä tärkeää on se, että osaa käyttää oikeanlaista renderöintitekniikkaa valaistuksen laskemiseen. Opinnäytetyössä käydään lävitse tyypillisimmät renderöintialgoritmit ja kerrotaan kuinka ne valaistuksen laskevat.
Tarkoituksena on lisäksi selvittää, miksi tietyssä tilanteessa kannattaa käyttää tai jättää käyttämättä tietynlaista valaistusta ja renderöintitekniikkaa. Opinnäytetyö toimii myös lyhyenä oppaana 3D-valaisutekniikoihin, koska samat tekniikat pätevät melkein kaikessa 3D:llä tehdyssä.
This thesis tells about 3D lighting, which is one of the most important aspects of 3D graphics. The thesis contains example images to facilitate understanding of the issues under discussion.
The right kind of lighting contributes much to how good and realistic the final 3D image looks. The aim here was to give an overview of 3D lighting and not focus on any particular program. This thesis presents the most common types of light and describes their properties. The different types of shadows and shadow algorithms are also discussed.
Without the right kind of rendering technique it is almost impossible to get realistic and convincing lighting. The right kind of use of lights and their placement is very important, but equally important is to know how to use the right kind of rendering technique to calculate the lighting. The thesis goes through the typical rendering algorithms and explains how they work.
The aim was also to find out why, in a particular situation, a particular kind of lighting and rendering technique should or should not be used. The thesis also serves as a brief guide to 3D lighting techniques, because the same techniques apply to almost all aspects of 3D.
Advisors/Committee Members: Tampereen ammattikorkeakoulu.
Subjects/Keywords: global illumination; renderöinti; 3D-valaistus
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APA (6th Edition):
Kontu, J. (2014). 3D-valaistuksen tekniikat. (Thesis). Tampereen ammattikorkeakoulu. Retrieved from http://www.theseus.fi/handle/10024/78257
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):
Kontu, Juha. “3D-valaistuksen tekniikat.” 2014. Thesis, Tampereen ammattikorkeakoulu. Accessed April 10, 2021.
http://www.theseus.fi/handle/10024/78257.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kontu, Juha. “3D-valaistuksen tekniikat.” 2014. Web. 10 Apr 2021.
Vancouver:
Kontu J. 3D-valaistuksen tekniikat. [Internet] [Thesis]. Tampereen ammattikorkeakoulu; 2014. [cited 2021 Apr 10].
Available from: http://www.theseus.fi/handle/10024/78257.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kontu J. 3D-valaistuksen tekniikat. [Thesis]. Tampereen ammattikorkeakoulu; 2014. Available from: http://www.theseus.fi/handle/10024/78257
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
12.
Lorentz, Nicholas.
Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study.
Degree: 2011, University of Waterloo
URL: http://hdl.handle.net/10012/6331
► Purpose: This is a pilot study to investigate gaze strategies for coping with glare when performing a simple visual task under intense contra light viewing…
(more)
▼ Purpose: This is a pilot study to investigate gaze strategies for coping with glare when performing a simple visual task under intense contra light viewing conditions.
Method: Twenty-four normally sighted participants were recruited for this study. They consisted of a young subgroup (n=12), aged 21-29 (mean = 25.3 ± 2.5), and an older subgroup (n=12), aged 51-71 (mean = 57.3 ± 6.1). Visual acuity (VA) and Brightness Acuity testing (BAT) were used to assess central vision. Participants were required to locate and approach (from 15m) a small platform that was contra lit by a powerful light source. Upon arrival at the platform, participants were required to insert a small ball into a similarly sized receptacle. An ASL Mobile Eye (Bedford, MA) eye tracker was used to monitor gaze position throughout until the task was completed. Scene and pupil videos were recorded for each participant and analyzed frame by frame to locate the participant’s eye movements.
Results: Two participants (one from each subgroup) adopted aversion gaze strategies wherein they avoided looking at the contra lit task for more than 50% of the task completion time. For the remainder of the experimental trial, these two participants were either looking toward the glare source or blinking. The other twenty-two participants opted to endure the contra light condition by gazing directly into the glare for the majority of the task completion time. An individual t-test between the younger
iv
subgroup’s BA scores vs. the older subgroup’s BA scores was statistically significant (p<0.05).
Significantly poorer BAT scores were found in the older subgroup, however, individual participant’s BAT scores did not necessarily predict the ability to cope with a contra lit glare source. Although, statistically significant differences were not found between the two subgroups when examining their VA and length of time to complete the course, a trend was found, as the older subgroup consistently had poorer VA scores and took longer to complete the course.
Further research must be completed with a larger sample size to fully understand the glare aversion strategies one must elicit when dealing with a contra lit glare source within the built environment, and to confirm the three glare strategies proposed by this pilot study.
Subjects/Keywords: glare; universal design; illumination
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APA (6th Edition):
Lorentz, N. (2011). Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6331
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):
Lorentz, Nicholas. “Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study.” 2011. Thesis, University of Waterloo. Accessed April 10, 2021.
http://hdl.handle.net/10012/6331.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lorentz, Nicholas. “Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study.” 2011. Web. 10 Apr 2021.
Vancouver:
Lorentz N. Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10012/6331.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lorentz N. Gaze strategies for coping with glare under intense contra light viewing conditions – A pilot study. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6331
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Sydney
13.
Ramakrishnan, Rishi.
Illumination Invariant Outdoor Perception
.
Degree: 2015, University of Sydney
URL: http://hdl.handle.net/2123/14522
► This thesis proposes the use of a multi-modal sensor approach to achieve illumination invariance in images taken in outdoor environments. The approach is automatic in…
(more)
▼ This thesis proposes the use of a multi-modal sensor approach to achieve illumination invariance in images taken in outdoor environments. The approach is automatic in that it does not require user input for initialisation, and is not reliant on the input of atmospheric radiative transfer models. While it is common to use pixel colour and intensity as features in high level vision algorithms, their performance is severely limited by the uncontrolled lighting and complex geometric structure of outdoor scenes. The appearance of a material is dependent on the incident illumination, which can vary due to spatial and temporal factors. This variability causes identical materials to appear differently depending on their location. Illumination invariant representations of the scene can potentially improve the performance of high level vision algorithms as they allow discrimination between pixels to occur based on the underlying material characteristics. The proposed approach to obtaining illumination invariance utilises fused image and geometric data. An approximation of the outdoor illumination is used to derive per-pixel scaling factors. This has the effect of relighting the entire scene using a single illuminant that is common in terms of colour and intensity for all pixels. The approach is extended to radiometric normalisation and the multi-image scenario, meaning that the resultant dataset is both spatially and temporally illumination invariant. The proposed illumination invariance approach is evaluated on several datasets and shows that spatial and temporal invariance can be achieved without loss of spectral dimensionality. The system requires very few tuning parameters, meaning that expert knowledge is not required in order for its operation. This has potential implications for robotics and remote sensing applications where perception systems play an integral role in developing a rich understanding of the scene.
Subjects/Keywords: Illumination invariance;
Robotics;
Remote sensing
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APA (6th Edition):
Ramakrishnan, R. (2015). Illumination Invariant Outdoor Perception
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/14522
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):
Ramakrishnan, Rishi. “Illumination Invariant Outdoor Perception
.” 2015. Thesis, University of Sydney. Accessed April 10, 2021.
http://hdl.handle.net/2123/14522.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ramakrishnan, Rishi. “Illumination Invariant Outdoor Perception
.” 2015. Web. 10 Apr 2021.
Vancouver:
Ramakrishnan R. Illumination Invariant Outdoor Perception
. [Internet] [Thesis]. University of Sydney; 2015. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2123/14522.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ramakrishnan R. Illumination Invariant Outdoor Perception
. [Thesis]. University of Sydney; 2015. Available from: http://hdl.handle.net/2123/14522
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
14.
Arkin, Jeremy Sandon.
Investigation into optimizing laser speckle contrast imaging illumination.
Degree: MSin Engineering, Biomedical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/61564
► The primary purpose of this work is to optimize the illumination parameters used for laser speckle imaging and investigate how spatial modulation of the light…
(more)
▼ The primary purpose of this work is to optimize the
illumination parameters used for laser speckle imaging and investigate how spatial modulation of the light used for
illumination can enhance the sampling volume. An in-line
illumination scheme is detailed that removes the need to manually position a side mounted coherent light source, instead utilizing a polarizing beam splitter (PBS) and linear polarizer to illuminate the sample plane through the same objective used to collect the backscattered light. This method ensures repeated, robust interrogation of the sample plane and allows for control over the light intensity using the polarizing elements.
Spatial modulation of the
illumination beam was then investigated as a method to increase the depth-penetration of LSCI. The premise was to use a focused beam of light, as opposed to a traditional wide-field beam, and illuminate the sample at various distances from the detector increasing the probability scattered photons sample deeper volumes. Single and two-point source configurations were used to image a microfluidic phantom with added static scattering layers to simulate different vessel depths. Varying the distance between the source and the detector, the camera field of view (FOV), we showed that it is possible to collect information from submerged vessels using a non-full field approach. This led to the design and implementation of an in-line, DMD-based
illumination scheme that allows the projection and modulation of spatially complex
illumination schemes.
Advisors/Committee Members: Dunn, Andrew Kenneth, 1970- (advisor).
Subjects/Keywords: Laser speckle contrast imaging; Illumination
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APA (6th Edition):
Arkin, J. S. (2017). Investigation into optimizing laser speckle contrast imaging illumination. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/61564
Chicago Manual of Style (16th Edition):
Arkin, Jeremy Sandon. “Investigation into optimizing laser speckle contrast imaging illumination.” 2017. Masters Thesis, University of Texas – Austin. Accessed April 10, 2021.
http://hdl.handle.net/2152/61564.
MLA Handbook (7th Edition):
Arkin, Jeremy Sandon. “Investigation into optimizing laser speckle contrast imaging illumination.” 2017. Web. 10 Apr 2021.
Vancouver:
Arkin JS. Investigation into optimizing laser speckle contrast imaging illumination. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2152/61564.
Council of Science Editors:
Arkin JS. Investigation into optimizing laser speckle contrast imaging illumination. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/61564
15.
Kontkanen, Janne.
Novel Illumination Algorithms for Off-Line and Real-Time Rendering.
Degree: 2007, Helsinki University of Technology
URL: http://lib.tkk.fi/Diss/2007/isbn9789512286102/
► This thesis presents new and efficient illumination algorithms for off-line and real-time rendering. The realistic rendering of arbitrary indirect illumination is a difficult task. Assuming…
(more)
▼ This thesis presents new and efficient illumination algorithms for off-line and real-time rendering. The realistic rendering of arbitrary indirect illumination is a difficult task. Assuming ray optics model of light, the rendering equation describes the propagation of light in the scene with high accuracy. However, the computation is expensive, and thus even in off-line rendering, i.e., in prerendered animations, indirect illumination is often approximated as it would otherwise constitute a bottleneck in the production pipeline. Indirect illumination can be computed using Monte Carlo integration, but when restrained to a reasonable amount of computation time, the result is often corrupted by noise. This thesis includes a method that effectively reduces the noise by applying a spatially varying filter to the noisy illumination. For real-time performance, some components of indirect illumination can be precomputed. Irradiance volume and many variations of it precompute reflections and shadowing of a static scene into a volumetric data structure. This data is then used to shade dynamic objects in real-time. The practical usage of the method is limited due to aliasing artifacts. This thesis shows that with a suitable super-sampling approach, a significant quality improvement can be obtained. Another direction is to precompute how light propagates in the scene and use the precomputed data during run-time to solve both direct and indirect illumination based on the known incident lighting. To keep the memory and precomputation costs tractable, these methods are typically restricted to infinitely distant lighting. Those that are not, require a very long precomputation time. This thesis presents an algorithm that adopts a wavelet-based hierarchical finite element method for the precomputation. A significant performance improvement over the existing techniques is obtained. When full global illumination cannot be afforded, ambient occlusion is an attractive alternative. This thesis includes two methods for real-time rendering of ambient occlusion in dynamic scenes. The first method models the shadowing of ambient light between rigid moving bodies. The second method gives a data-oriented solution for rendering approximate ambient occlusion for animated characters in real-time. Both methods achieve unprecedented efficiency.
Publications in telecommunications software and multimedia. A, ISSN 1455-9722; 17
Advisors/Committee Members: Helsinki University of Technology, Department of Computer Science and Engineering, Telecommunications Software and Multimedia Laboratory.
Subjects/Keywords: computer graphics; shading; global illumination; indirect illumination; ambient occlusion
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APA ·
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Export
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APA (6th Edition):
Kontkanen, J. (2007). Novel Illumination Algorithms for Off-Line and Real-Time Rendering. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2007/isbn9789512286102/
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):
Kontkanen, Janne. “Novel Illumination Algorithms for Off-Line and Real-Time Rendering.” 2007. Thesis, Helsinki University of Technology. Accessed April 10, 2021.
http://lib.tkk.fi/Diss/2007/isbn9789512286102/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kontkanen, Janne. “Novel Illumination Algorithms for Off-Line and Real-Time Rendering.” 2007. Web. 10 Apr 2021.
Vancouver:
Kontkanen J. Novel Illumination Algorithms for Off-Line and Real-Time Rendering. [Internet] [Thesis]. Helsinki University of Technology; 2007. [cited 2021 Apr 10].
Available from: http://lib.tkk.fi/Diss/2007/isbn9789512286102/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kontkanen J. Novel Illumination Algorithms for Off-Line and Real-Time Rendering. [Thesis]. Helsinki University of Technology; 2007. Available from: http://lib.tkk.fi/Diss/2007/isbn9789512286102/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Victoria University of Wellington
16.
Bennett, Joseph.
Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes.
Degree: 2019, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8500
► Real-time global illumination that scales from low to high-end hardware is important for interactive applications so they can reach wider audiences. To do this, the…
(more)
▼ Real-time global
illumination that scales from low to high-end hardware is important for interactive applications so they can reach wider audiences. To do this, the real-time lighting algorithm used needs to have varying performance characteristics.
Sparse Radiance Probes (SRP) is a recent real-time global
illumination algorithm that runs in under 5 ms per frame on a high-end Nvidia Titan X GPU. Its low per-frame timings suggest it could scale to low-end devices, but no prior work provides complete implementation details and evaluates its performance across devices with varying performance characteristics to prove this. Therefore, this thesis aims to fill this gap and determine if SRP is scalable across low to high-end devices. SRP is implemented with adjustable scaling parameters, and its performance is compared across three test devices. A low-end iPhone 7, a mid-range AMD Radeon 560 graphics card, and a high-end AMD RX Vega 56 graphics card. The implementation in this thesis ran above 60 FPS for simple scenes on the iPhone 7, and with a reasonable reduction in quality, it ran just above 30 FPS on more complex scenes like Crytek Sponza. These results show that SRP can scale to low-end devices. While the implementation in this thesis runs in real time, there are implementation optimisations that would make SRP run even faster across all the test devices without reducing quality.
Advisors/Committee Members: Rhee, Taehyun, Chalmers, Andrew.
Subjects/Keywords: Global illumination; Real-time; Computer graphics; Sparse Radiance Probes; Lighting; Illumination
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Export
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APA (6th Edition):
Bennett, J. (2019). Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8500
Chicago Manual of Style (16th Edition):
Bennett, Joseph. “Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes.” 2019. Masters Thesis, Victoria University of Wellington. Accessed April 10, 2021.
http://hdl.handle.net/10063/8500.
MLA Handbook (7th Edition):
Bennett, Joseph. “Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes.” 2019. Web. 10 Apr 2021.
Vancouver:
Bennett J. Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes. [Internet] [Masters thesis]. Victoria University of Wellington; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10063/8500.
Council of Science Editors:
Bennett J. Global Illumination on a Mobile Phone: Scalable Real-time Global Illumination using Sparse Radiance Probes. [Masters Thesis]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8500
IUPUI
17.
Alhakamy, A'aeshah A.
Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments.
Degree: 2020, IUPUI
URL: http://hdl.handle.net/1805/24085
► Indiana University-Purdue University Indianapolis (IUPUI)
Although current augmented, virtual, and mixed reality (AR/VR/MR) systems are facing advanced and immersive experience in the entertainment industry with…
(more)
▼ Indiana University-Purdue University Indianapolis (IUPUI)
Although current augmented, virtual, and mixed reality (AR/VR/MR) systems are facing advanced and immersive experience in the entertainment industry with countless media forms. Theses systems suffer a lack of correct direct and indirect illumination modeling where the virtual objects render with the same lighting condition as the real environment. Some systems are using baked GI, pre-recorded textures, and light probes that are mostly accomplished offline to compensate for precomputed real-time global illumination (GI). Thus, illumination information can be extracted from the physical scene for interactively rendering the virtual objects into the real world which produces a more realistic final scene in real-time. This work approaches the problem of visual coherence in AR by proposing a system that detects the real-world lighting conditions in dynamic scenes, then uses the extracted illumination information to render the objects added to the scene. The system covers several major components to achieve a more realistic augmented reality outcome. First, the detection of the incident light (direct illumination) from the physical scene with the use of computer vision techniques based on the topological structural analysis of 2D images using a live-feed 360-degree camera instrumented on an AR device that captures the entire radiance map. Also, the physics-based light polarization eliminates or reduces false-positive lights such as white surfaces, reflections, or glare which negatively affect the light detection process. Second, the simulation of the reflected light (indirect illumination) that bounce between the real-world surfaces to be rendered into the virtual objects and reflect their existence in the virtual world. Third, defining the shading characteristic/properties of the virtual object to depict the correct lighting assets with a suitable shadow casting. Fourth, the geometric properties of real-scene including plane detection, 3D surface reconstruction, and simple meshing are incorporated with the virtual scene for more realistic depth interactions between the real and virtual objects. These components are developed methods which assumed to be working simultaneously in real-time for photo-realistic AR. The system is tested with several lighting conditions to evaluate the accuracy of the results based on the error incurred between the real/virtual objects casting shadow and interactions. For system efficiency, the rendering time is compared with previous works and research. Further evaluation of human perception is conducted through a user study. The overall performance of the system is investigated to reduce the cost to a minimum.
Advisors/Committee Members: Tuceryan, Mihran, Fang, Shiaofen, Zheng, Jiang Ya, Mukhopadhyay, Snehasis.
Subjects/Keywords: Physical Illumination; Augmented Reality; Dynamic Environment; Image-Based Lighting; Physics-Based Polarization; Direct Illumination; Indirect Illumination; Incident Light; Reflected Light
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APA (6th Edition):
Alhakamy, A. A. (2020). Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/24085
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):
Alhakamy, A'aeshah A. “Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments.” 2020. Thesis, IUPUI. Accessed April 10, 2021.
http://hdl.handle.net/1805/24085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alhakamy, A'aeshah A. “Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments.” 2020. Web. 10 Apr 2021.
Vancouver:
Alhakamy AA. Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments. [Internet] [Thesis]. IUPUI; 2020. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1805/24085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alhakamy AA. Extraction and Integration of Physical Illumination in Dynamic Augmented Reality Environments. [Thesis]. IUPUI; 2020. Available from: http://hdl.handle.net/1805/24085
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Carnegie Mellon University
18.
Achar, Supreeth.
Active Illumination for the RealWorld.
Degree: 2017, Carnegie Mellon University
URL: http://repository.cmu.edu/dissertations/1080
► Active illumination systems use a controllable light source and a light sensor to measure properties of a scene. For such a system to work reliably…
(more)
▼ Active illumination systems use a controllable light source and a light sensor to measure properties of a scene. For such a system to work reliably across a wide range of environments it must be able to handle the effects of global light transport, bright ambient light, interference from other active illumination devices, defocus, and scene motion. The goal of this thesis is to develop computational techniques and hardware arrangements to make active illumination devices based on commodity-grade components that work under real world conditions. We aim to combine the robustness of a scanning laser rangefinder with the speed, measurement density, compactness, and economy of a consumer depth camera. Towards this end, we have made four contributions. The first is a computational technique for compensating for the effects of motion while separating the direct and global components of illumination. The second is a method that combines triangulation and depth from illumination defocus cues to increase the working range of a projector-camera system. The third is a new active illumination device that can efficiently image the epipolar component of light transport between a source and sensor. The device can measure depth using active stereo or structured light and is robust to many global light transport effects. Most importantly, it works outdoors in bright sunlight despite using a low power source. Finally, we extend the proposed epipolar-only imaging technique to time-of-flight sensing and build a low-power sensor that is robust to sunlight, global illumination, multi-device interference, and camera shake. We believe that the algorithms and sensors proposed and developed in this thesis could find applications in a diverse set of fields including mobile robotics, medical imaging, gesture recognition, and agriculture.
Subjects/Keywords: Computational Imaging; Active Illumination; Depth Sensing
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APA (6th Edition):
Achar, S. (2017). Active Illumination for the RealWorld. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/1080
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):
Achar, Supreeth. “Active Illumination for the RealWorld.” 2017. Thesis, Carnegie Mellon University. Accessed April 10, 2021.
http://repository.cmu.edu/dissertations/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Achar, Supreeth. “Active Illumination for the RealWorld.” 2017. Web. 10 Apr 2021.
Vancouver:
Achar S. Active Illumination for the RealWorld. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2021 Apr 10].
Available from: http://repository.cmu.edu/dissertations/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Achar S. Active Illumination for the RealWorld. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/1080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Toulouse II – Le Mirail
19.
Nadal, Emilie.
Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2).
Degree: Docteur es, Histoire de l'art, 2013, Université Toulouse II – Le Mirail
URL: http://www.theses.fr/2013TOU20114
► En 1350, Pierre de la Jugie, neveu du pape Clément VI, est depuis trois ans sur le siège de Narbonne, à la tête d’un des…
(more)
▼ En 1350, Pierre de la Jugie, neveu du pape Clément VI, est depuis trois ans sur le siège de Narbonne, à la tête d’un des archevêchés les plus riches du royaume de France, lorsqu’il décide de faire réaliser un pontifical à la hauteur de ses ambitions. Orné de 24 médaillons pour le calendrier, d’une pleine page, et de 61 lettres historiées encore en place (une vingtaine a été découpé), l’ouvrage est un témoignage exceptionnel, bien documenté, qui permet de comprendre les modalités de la commande des manuscrits liturgiques enluminés au XIVe siècle, et qu’il est possible de replacer dans un contexte politique, religieux et artistique bien déterminé. Le livre n’est qu’en partie fidèle au modèle de pontifical établi par Guillaume Durand. Outre un calendrier et des feuillets de comput, il contient aussi plusieurs textes additionnels, expressément ajoutés par Pierre de la Jugie pour certains d’entre eux, et accompagné d’une iconographie qui leur est propre. L’étude des textes, du calendrier au pontifical, et de l’iconographie choisie pour les illustrer, permet de mettre en valeur la forte implication du commanditaire dans la mise en place de ce livre. Les peintures qui ornent ces pages sont l’œuvre de quatre artistes qui, en dépit de leurs formations différentes (Catalogne, Sud de la France, Italie) ont collaboré et se sont mutuellement influencés. Le recensement des productions de chacun des enlumineurs permet enfin de mettre en valeur l’existence de réseaux d’échanges entre les artistes et les commanditaires ecclésiastiques appartenant à un même clan de prélats limousins.
In 1350 , Pierre de la Jugie, archbishop of Narbonne and nephew of Pope Clement VI, decides to make a Pontifical that lives up to his ambitions. Decorated with 24 medallions for the calendar, a full page and 61 historiated letters, the book is an exceptional testimony, well documented, which helps to understand the ways liturgical illuminated manuscripts were ordered during the fourteenth century, and it can be replaced in a well-defined political, religious and artistic context. In addition to a calendar, and computus, this pontifical of Guillaume Durand also contains several additional texts, specifically added by Pierre de la Jugie for some of them, and accompanied by an iconography of their own. The study of the text and iconography highlights the strong involvement of the ecclesiastical patron in the creation of this book. The paintings that adorn these pages are the work of four artists who, despite their different backgrounds (Catalonia, southern France, Italy) have collaborated and influenced each other. The census of production of each of illuminators can finally highlight the existence of exchanges between artists and church patrons belonging to the same clan prelates Limousin networks.
Advisors/Committee Members: Pousthomis-Dalle, Nelly (thesis director), Czerniak, Virginie (thesis director).
Subjects/Keywords: Enluminure; Pontificaux; Illumination; Pontifical; 14th century
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APA (6th Edition):
Nadal, E. (2013). Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2). (Doctoral Dissertation). Université Toulouse II – Le Mirail. Retrieved from http://www.theses.fr/2013TOU20114
Chicago Manual of Style (16th Edition):
Nadal, Emilie. “Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2).” 2013. Doctoral Dissertation, Université Toulouse II – Le Mirail. Accessed April 10, 2021.
http://www.theses.fr/2013TOU20114.
MLA Handbook (7th Edition):
Nadal, Emilie. “Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2).” 2013. Web. 10 Apr 2021.
Vancouver:
Nadal E. Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2). [Internet] [Doctoral dissertation]. Université Toulouse II – Le Mirail; 2013. [cited 2021 Apr 10].
Available from: http://www.theses.fr/2013TOU20114.
Council of Science Editors:
Nadal E. Le miroir d'un archevêque : étude autour du pontifical de Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2) : The mirror of an archbishop : research around the pontifical of Pierre de la Jugie (Narbonne, Trésor de la cathédrale, ms. 2). [Doctoral Dissertation]. Université Toulouse II – Le Mirail; 2013. Available from: http://www.theses.fr/2013TOU20114
Penn State University
20.
Subramaniam, Sarith.
Multi-zone control of daylight-responsive lighting control systems.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/19990
► Daylight responsive lighting control systems are employed to optimize the use of electric lighting in a daylit space. Although the potential of daylight-responsive lighting controls…
(more)
▼ Daylight responsive lighting control systems are employed to optimize the use of electric lighting in a daylit space. Although the potential of daylight-responsive lighting controls systems is widely acknowledged, the present-day performance of such systems is far from optimized. Several studies have reported discrepancies between their promised and actual performance.
Most contemporary daylight-responsive lighting control systems, whether based on switching or dimming control, are single-zone systems. While single-zone systems may perform satisfactorily in small spaces, expanding their scope to spaces with large spatial depth results in an uneconomical expenditure of electric energy. This thesis examines the potential of multi-zone control for improving the performance of daylight-responsive dimming systems.
Preliminary studies conducted on multi-zone systems focused on investigating the performance of such systems in optimized conditions. The optimized control algorithms for multi-zone systems demonstrated up to 14% greater energy savings than the optimized algorithms for single-zone system. A sequentially optimized multi-zone algorithm was developed on the basis of the dimming trends observed with a fully optimized multi-zone algorithm. The savings obtained through the sequential algorithm were comparable to those obtained through a fully optimized algorithm.
The performance of the multi-zone sequential algorithm was compared to that of a conventional single-zone algorithm in a quasi-real world application where workplane-based photosensors were used to dim electric lighting in a daylit room. The application of a multi-zone sequential algorithm provided up to 14% greater annual energy savings than the single-zone algorithm. The accuracy of both single and multi-zone algorithms was shown to be dependent on the quantity and positioning of workplane-based photosensors.
The author recommends further research to comprehensively evaluate the potential of multi-zone systems and their application to real-world dimming systems.
Advisors/Committee Members: Richard George Mistrick, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Daylighting; Lighting control systems; Energy; Illumination
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APA (6th Edition):
Subramaniam, S. (2013). Multi-zone control of daylight-responsive lighting control systems. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19990
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):
Subramaniam, Sarith. “Multi-zone control of daylight-responsive lighting control systems.” 2013. Thesis, Penn State University. Accessed April 10, 2021.
https://submit-etda.libraries.psu.edu/catalog/19990.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Subramaniam, Sarith. “Multi-zone control of daylight-responsive lighting control systems.” 2013. Web. 10 Apr 2021.
Vancouver:
Subramaniam S. Multi-zone control of daylight-responsive lighting control systems. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Apr 10].
Available from: https://submit-etda.libraries.psu.edu/catalog/19990.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Subramaniam S. Multi-zone control of daylight-responsive lighting control systems. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19990
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brigham Young University
21.
Ricks, Brian C.
Graph-based Global Illumination.
Degree: MS, 2010, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3422&context=etd
► The slow render times of global illumination algorithms make them impractical in most commercial and academic settings. We propose a novel framework for calculating the…
(more)
▼ The slow render times of global illumination algorithms make them impractical in most commercial and academic settings. We propose a novel framework for calculating the computational complexity of global illumination algorithms and show that no other recent improvements have reduced this complexity. We further show that many algorithms use a tree as their rendering paradigm. We propose a new rendering algorithm, pipe casting, which calculates light paths using a graph instead of a tree. Pipe casting significantly reduces both computational complexity and actual render time of rendering. Using an L2 pixel-wise error comparison, on average our algorithm can render a variety of scenes at the same error as traditional algorithms but in about 50% of the time.
Subjects/Keywords: global illumination; computational complexity; Computer Sciences
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APA (6th Edition):
Ricks, B. C. (2010). Graph-based Global Illumination. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3422&context=etd
Chicago Manual of Style (16th Edition):
Ricks, Brian C. “Graph-based Global Illumination.” 2010. Masters Thesis, Brigham Young University. Accessed April 10, 2021.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3422&context=etd.
MLA Handbook (7th Edition):
Ricks, Brian C. “Graph-based Global Illumination.” 2010. Web. 10 Apr 2021.
Vancouver:
Ricks BC. Graph-based Global Illumination. [Internet] [Masters thesis]. Brigham Young University; 2010. [cited 2021 Apr 10].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3422&context=etd.
Council of Science Editors:
Ricks BC. Graph-based Global Illumination. [Masters Thesis]. Brigham Young University; 2010. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3422&context=etd
Boston University
22.
Zhao, Jinyuan.
Active scene illumination metods for privacy-preserving indoor occupant localization.
Degree: PhD, Electrical & Computer Engineering, 2019, Boston University
URL: http://hdl.handle.net/2144/38209
► Indoor occupant localization is a key component of location-based smart-space applications. Such applications are expected to save energy and provide productivity gains and health benefits.…
(more)
▼ Indoor occupant localization is a key component of location-based smart-space applications. Such applications are expected to save energy and provide productivity gains and health benefits. Many traditional camera-based indoor localization systems use visual information to detect and analyze the states of room occupants. These systems, however, may not be acceptable in privacy-sensitive scenarios since high-resolution images may reveal room and occupant details to eavesdroppers. To address visual privacy concerns, approaches have been developed using extremely-low-resolution light sensors, which provide limited visual information and preserve privacy even if hacked. These systems preserve visual privacy and are reasonably accurate, but they fail in the presence of noise and ambient light changes.
This dissertation focuses on two-dimensional localization of an occupant on the floor plane, where three goals are considered in the development of an indoor localization system: accuracy, robustness and visual privacy preservation. Unlike techniques that preserve user privacy by degrading full-resolution data, this dissertation focuses on an array of single-pixel light sensors. Furthermore, to make the system robust to noise, ambient light changes and sensor failures, the scene is actively illuminated by modulating an array of LED light sources, which allows algorithms to use light transported from sources to sensors (described as light transport matrix) instead of raw sensor readings. Finally, to assure accurate localization, both principled model-based algorithms and learning-based approaches via active scene
illumination are proposed.
In the proposed model-based algorithm, the appearance of an object is modeled as a change in floor reflectivity in some area. A ridge regression algorithm is developed to estimate the change of floor reflectivity from change in the light transport matrix caused by appearance of the object. The region of largest reflectivity change identifies object location. Experimental validation demonstrates that the proposed algorithm can accurately localize both flat objects and human occupants, and is robust to noise,
illumination changes and sensor failures. In addition, a sensor design using aperture grids is proposed which further improves localization accuracy. As for learning-based approaches, this dissertation proposes a convolutional neural network, which reshapes the input light transport matrix to take advantage of spatial correlations between sensors. As a result, the proposed network can accurately localize human occupants in both simulations and the real testbed with a small number of training samples. Moreover, unlike model-based approaches, the proposed network does not require modeling assumptions or knowledge of room, sources and sensors.
Advisors/Committee Members: Ishwar, Prakash (advisor), Konrad, Janusz L. (advisor).
Subjects/Keywords: Electrical engineering; Active illumination; Indoor localization
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MLA ·
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Export
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Manager
APA (6th Edition):
Zhao, J. (2019). Active scene illumination metods for privacy-preserving indoor occupant localization. (Doctoral Dissertation). Boston University. Retrieved from http://hdl.handle.net/2144/38209
Chicago Manual of Style (16th Edition):
Zhao, Jinyuan. “Active scene illumination metods for privacy-preserving indoor occupant localization.” 2019. Doctoral Dissertation, Boston University. Accessed April 10, 2021.
http://hdl.handle.net/2144/38209.
MLA Handbook (7th Edition):
Zhao, Jinyuan. “Active scene illumination metods for privacy-preserving indoor occupant localization.” 2019. Web. 10 Apr 2021.
Vancouver:
Zhao J. Active scene illumination metods for privacy-preserving indoor occupant localization. [Internet] [Doctoral dissertation]. Boston University; 2019. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2144/38209.
Council of Science Editors:
Zhao J. Active scene illumination metods for privacy-preserving indoor occupant localization. [Doctoral Dissertation]. Boston University; 2019. Available from: http://hdl.handle.net/2144/38209
University of Arizona
23.
Tidd, Megan M.
Far-Field Illumination Optic Style Recommender Algorithm
.
Degree: 2020, University of Arizona
URL: http://hdl.handle.net/10150/641394
► While the number of different far-field illumination applications are many, so too are the number of optic styles that efficiently control a light distribution into…
(more)
▼ While the number of different far-field
illumination applications are many, so too are the number of optic styles that efficiently control a light distribution into a desired beam pattern. A given desired beam pattern is described with symmetry and beam size specifications. Refraction and total internal reflection are combined in multiple ways to produce many effective optic styles, comprising variations of collimator lens styles and bubble lens styles. Eight base styles are described, and discussion includes why each style is optimal for certain beam pattern specifications (specified by symmetry and beam size). Furthermore, a linear style is applied to the base optic style for certain light source spacings, and a prismatic style is applied to the base optic style for certain optic size restrictions. The Optic Style Recommender Algorithm is built from the logic for optimal base optic style (based on desired distribution inputs) and for prismatic and/or linear features (based on design constraints inputs). In this thesis, the complete algorithm process is thoroughly defined and then implemented in a chatbot platform. The algorithm outputs a recommended base optic style and optic features, guiding a designer on how to start with optical design. The algorithm’s recommendations thus give novice optic designers a significant head start in their design work. The algorithm also has potential to be programmatically connected to existing design optimization tools which are generally specific to a single optic style. The Optic Style Recommender Algorithm thus introduces more automation and easier access to the
illumination optical design process.
Advisors/Committee Members: Koshel, Richard J (advisor), Schwiegerling, James T. (committeemember), Sasian, Jose M. (committeemember).
Subjects/Keywords: algorithm;
chatbot;
far-field;
illumination;
optics;
style
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APA (6th Edition):
Tidd, M. M. (2020). Far-Field Illumination Optic Style Recommender Algorithm
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/641394
Chicago Manual of Style (16th Edition):
Tidd, Megan M. “Far-Field Illumination Optic Style Recommender Algorithm
.” 2020. Masters Thesis, University of Arizona. Accessed April 10, 2021.
http://hdl.handle.net/10150/641394.
MLA Handbook (7th Edition):
Tidd, Megan M. “Far-Field Illumination Optic Style Recommender Algorithm
.” 2020. Web. 10 Apr 2021.
Vancouver:
Tidd MM. Far-Field Illumination Optic Style Recommender Algorithm
. [Internet] [Masters thesis]. University of Arizona; 2020. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10150/641394.
Council of Science Editors:
Tidd MM. Far-Field Illumination Optic Style Recommender Algorithm
. [Masters Thesis]. University of Arizona; 2020. Available from: http://hdl.handle.net/10150/641394
University of Toronto
24.
Abou-Khatwa, Noha.
Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt.
Degree: PhD, 2017, University of Toronto
URL: http://hdl.handle.net/1807/97102
► The Mamluks of Egypt and Syria excelled in most arts, especially architecture and Qur’an manuscript production. While their architecture is heavily studied, very little in…
(more)
▼ The Mamluks of Egypt and Syria excelled in most arts, especially architecture and Qur’an manuscript production. While their architecture is heavily studied, very little in depth research has been done on their Qur’an manuscripts, especially the collection kept at the National Library of Egypt (Dar al-Kutub al-Misriyya). This dissertation examines and analyzes the illumination and calligraphy of the Mamluk Qur’an manuscripts produced after the death of the Mamluk sultan al-Nasir Muhammad ibn Qalawun (d. 741/1341) until the death of the second Circassian Mamluk sultan Faraj ibn Barquq (d. 815/1412), that are kept in Dar al-Kutub. This period in Mamluk history was a turbulent one with socio-political calamities, yet Qur’an manuscript production was not affected.
Illumination and calligraphy workshops have been identified using stylistic similarities in conjunction with the information found in the rich chronicles and biographical dictionaries of the Mamluk period. Biographies of artists, mostly calligraphers, were reconstructed and their modes of learning were investigated to shed light on their training process depending primarily on the calligraphy treatises of the period. Patrons, especially in their capacity as supporters of workshops, were also studied in light of the primary sources and to a lesser extent through their architecture.
2019-11-01 00:00:00
Advisors/Committee Members: Ruehrdanz, Karin, Near and Middle Eastern Civilizations.
Subjects/Keywords: calligraphy; Egypt; illumination; Mamluk; Medieval; 0377
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APA (6th Edition):
Abou-Khatwa, N. (2017). Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/97102
Chicago Manual of Style (16th Edition):
Abou-Khatwa, Noha. “Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt.” 2017. Doctoral Dissertation, University of Toronto. Accessed April 10, 2021.
http://hdl.handle.net/1807/97102.
MLA Handbook (7th Edition):
Abou-Khatwa, Noha. “Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt.” 2017. Web. 10 Apr 2021.
Vancouver:
Abou-Khatwa N. Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt. [Internet] [Doctoral dissertation]. University of Toronto; 2017. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/1807/97102.
Council of Science Editors:
Abou-Khatwa N. Calligraphers, Illuminators and Patrons: Mamluk Qur'an Manuscripts from 1341-1412 AD in light of the collection of the National Library of Egypt. [Doctoral Dissertation]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/97102
University of Ontario Institute of Technology
25.
Sherif, William.
Vector occluders: an empirical approximation for rendering global illumination effects in real-time.
Degree: 2013, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/301
► Precomputation has been previously used as a means to get global illumination effects in real-time on consumer hardware of the day. Our work uses Sloan???s…
(more)
▼ Precomputation has been previously used as a means to get global
illumination effects
in real-time on consumer hardware of the day. Our work uses Sloan???s 2002 PRT method
as a starting point, and builds on it with two new ideas.
We first explore an alternative representation for PRT data. ???Cpherical harmonics???
(CH) are introduced as an alternative to spherical harmonics, by substituting the
Chebyshev polynomial in the place of the Legendre polynomial as the orthogonal
polynomial in the spherical harmonics definition. We show that CH can be used instead
of SH for PRT with near-equivalent performance.
???Vector occluders??? (VO) are introduced as a novel, precomputed, real-time, empirical
technique for adding global
illumination effects including shadows, caustics and
interreflections to a locally illuminated scene on static geometry. VO encodes PRT data
as simple vectors instead of using SH. VO can handle point lights, whereas a standard
SH implementation cannot.
Advisors/Committee Members: Green, Mark.
Subjects/Keywords: Global illumination; Real-time; Shadows; Caustics; Interreflections
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Export
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APA (6th Edition):
Sherif, W. (2013). Vector occluders: an empirical approximation for rendering global illumination effects in real-time. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/301
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):
Sherif, William. “Vector occluders: an empirical approximation for rendering global illumination effects in real-time.” 2013. Thesis, University of Ontario Institute of Technology. Accessed April 10, 2021.
http://hdl.handle.net/10155/301.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sherif, William. “Vector occluders: an empirical approximation for rendering global illumination effects in real-time.” 2013. Web. 10 Apr 2021.
Vancouver:
Sherif W. Vector occluders: an empirical approximation for rendering global illumination effects in real-time. [Internet] [Thesis]. University of Ontario Institute of Technology; 2013. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10155/301.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sherif W. Vector occluders: an empirical approximation for rendering global illumination effects in real-time. [Thesis]. University of Ontario Institute of Technology; 2013. Available from: http://hdl.handle.net/10155/301
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas Tech University
26.
Chavan, Akshay R.
Multispectral imager using band pass optical filters and image illumination correction.
Degree: Electrical and Computer Engineering, 2011, Texas Tech University
URL: http://hdl.handle.net/2346/ETD-TTU-2011-08-1605
► Commercially available multispectral or hyperspectral imaging systems are designed to capture images, at predefined wavelength intervals. Various mechanisms are implemented for changing the wavelength intervals…
(more)
▼ Commercially available multispectral or hyperspectral imaging systems are designed to capture images, at predefined wavelength intervals. Various mechanisms are implemented for changing the wavelength intervals of light used for capturing spectral images, and any variations in these frequency intervals require major alterations. Dispersion of light is carried out either by diffraction gratings or by electronically tunable filters. Apparatus with diffraction grating are inexpensive but have slow response time. Electronically tunable filters have quick response time but make the apparatus expensive.
Imaging systems where optical filters are mounted on a rotating disc to capture hyperspectral images have a predefined utility because there is no means to select or adjust the filters that are placed on the disc for an given experiment.
The proposed approach includes the use of step up rings to attach the optical filters with threaded c-mount attachments to the holes in a metal disc. The use of step up rings to mount the optical filters provides a way to replace filters effortlessly. As a result, the system has additional research functionality to be used as a test structure to evaluate the performance of the filters, based on their response and the selection of central frequency according to the requirements of an experiment.
The precision processing of light required while using diffraction gratings or tunable filters can be avoided by the use of optical filters. The assembly with optical filters does not require precise control on the disc, because positioning the filters in front of the camera.
The proposed assembly also provides a prototype that can be improved to accelerate the process of image acquisition, which will make the apparatus faster than the one with diffraction grating and less expensive than the one with tunable filters.
Advisors/Committee Members: Nutter, Brian (Committee Chair), Mitra, Sunanda (committee member).
Subjects/Keywords: Multispectral; Hyperspectral; Optical filters; Illumination correction
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APA (6th Edition):
Chavan, A. R. (2011). Multispectral imager using band pass optical filters and image illumination correction. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/ETD-TTU-2011-08-1605
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):
Chavan, Akshay R. “Multispectral imager using band pass optical filters and image illumination correction.” 2011. Thesis, Texas Tech University. Accessed April 10, 2021.
http://hdl.handle.net/2346/ETD-TTU-2011-08-1605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chavan, Akshay R. “Multispectral imager using band pass optical filters and image illumination correction.” 2011. Web. 10 Apr 2021.
Vancouver:
Chavan AR. Multispectral imager using band pass optical filters and image illumination correction. [Internet] [Thesis]. Texas Tech University; 2011. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/2346/ETD-TTU-2011-08-1605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chavan AR. Multispectral imager using band pass optical filters and image illumination correction. [Thesis]. Texas Tech University; 2011. Available from: http://hdl.handle.net/2346/ETD-TTU-2011-08-1605
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Arizona
27.
Uthoff, Ross.
Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
.
Degree: 2015, University of Arizona
URL: http://hdl.handle.net/10150/593619
► Shown is the design of the Smartphone Oral Cancer Detection System (SOCeeDS). The SOCeeDS attaches to a smartphone and utilizes its embedded imaging optics and…
(more)
▼ Shown is the design of the Smartphone Oral Cancer Detection System (SOCeeDS). The SOCeeDS attaches to a smartphone and utilizes its embedded imaging optics and sensors to capture images of the oral cavity to detect oral cancer. Violet
illumination sources excite the oral tissues to induce fluorescence. Images are captured with the smartphone’s onboard camera. Areas where the tissues of the oral cavity are darkened signify an absence of fluorescence signal, indicating breakdown in tissue structure brought by precancerous or cancerous conditions. With this data the patient can seek further testing and diagnosis as needed. Proliferation of this device will allow communities with limited access to healthcare professionals a tool to detect cancer in its early stages, increasing the likelihood of cancer reversal.
Advisors/Committee Members: Liang, Rongguang (advisor), Liang, Rongguang (committeemember), Koshel, Richard J. (committeemember), Schwiegerling, Jim (committeemember).
Subjects/Keywords: illumination;
imaging;
mHealth;
optics;
Optical Sciences;
fluorescence
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APA (6th Edition):
Uthoff, R. (2015). Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/593619
Chicago Manual of Style (16th Edition):
Uthoff, Ross. “Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
.” 2015. Masters Thesis, University of Arizona. Accessed April 10, 2021.
http://hdl.handle.net/10150/593619.
MLA Handbook (7th Edition):
Uthoff, Ross. “Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
.” 2015. Web. 10 Apr 2021.
Vancouver:
Uthoff R. Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
. [Internet] [Masters thesis]. University of Arizona; 2015. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10150/593619.
Council of Science Editors:
Uthoff R. Design of a Smartphone-Camera-based Fluorescence Imaging System for the Detection of Oral Cancer
. [Masters Thesis]. University of Arizona; 2015. Available from: http://hdl.handle.net/10150/593619
University of Arizona
28.
Williams, Kaitlyn Elizabeth.
Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
.
Degree: 2017, University of Arizona
URL: http://hdl.handle.net/10150/624141
► Two optical design scenarios—imaging and illumination—were investigated for their use of Cartesian- and polar-based functions to generate freeform optical surfaces. The imaging scenario investigated a…
(more)
▼ Two optical design scenarios—imaging and illumination—were investigated for their use of Cartesian- and polar-based functions to generate freeform optical surfaces. The imaging scenario investigated a single-element, refracting freeform surface that converts an on-axis object field to an off-axis image point. XY polynomials (Cartesian but not orthogonal) and Zernike polynomials (Polar and orthogonal) were the two different function sets used to manipulate the surfaces to achieve the freeform imaging scenarios. The investigation discovered that the results between both function sets did not differ enough to single out a more effective surface type. However, the results did indicate that the Zernike function set typically required fewer coefficients to converge on an optimal imaging solution. The
illumination scenario utilized an architectural lighting situation surrounding the Rothko exhibit for Green on Blue at the University of Arizona Museum of Art. The source location was fixed to the light track in the exhibit space and pointed in many different orientations towards the painting. For each orientation, a point cloud of a freeform optical surface was generated such that the painting surface was illuminated with uniform and low-level light. For each of these generated point clouds, a Legendre (Cartesian and orthogonal) and a Zernike (polar and orthogonal) fitting function was applied, and the convergence results were compared. In general, it was found that, after the 20th included fit term, the Legendre function resulted in a smaller RMS fit error than the Zernike function. However, if the light source was pointed near the center of the painting, the Zernike function converged on a solution with fewer fit terms than Legendre. Amidst the imaging scenario, a definition for the extent to which a surface was freeform, or the "freeformity", was given. This definition proved to be an effective solution when the image size was compared for an F/3.33, F/4, F/5, and F/6.67 system for a range of different image focusing heights: the image size trends for each F-number overlapped, indicating a universal freeform term. In addition, a recursive formula for Cartesian Zernike polynomials was defined, which was used to generate an infinite number of Zernike terms using one single recursive expression.
Advisors/Committee Members: Koshel, Richard J (advisor), Koshel, Richard J. (committeemember), Kim, Dae Wook (committeemember), Sasian, Jose (committeemember).
Subjects/Keywords: Cartesian Zernike;
Freeform;
Freeformity;
Illumination;
Imaging
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APA ·
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APA (6th Edition):
Williams, K. E. (2017). Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/624141
Chicago Manual of Style (16th Edition):
Williams, Kaitlyn Elizabeth. “Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
.” 2017. Masters Thesis, University of Arizona. Accessed April 10, 2021.
http://hdl.handle.net/10150/624141.
MLA Handbook (7th Edition):
Williams, Kaitlyn Elizabeth. “Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
.” 2017. Web. 10 Apr 2021.
Vancouver:
Williams KE. Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
. [Internet] [Masters thesis]. University of Arizona; 2017. [cited 2021 Apr 10].
Available from: http://hdl.handle.net/10150/624141.
Council of Science Editors:
Williams KE. Parametrizing Freeform Optical Surfaces for the Optimized Design of Imaging and Illumination Systems
. [Masters Thesis]. University of Arizona; 2017. Available from: http://hdl.handle.net/10150/624141
University of Nottingham
29.
Kent, Michael G.
Temporal effects in glare response.
Degree: PhD, 2016, University of Nottingham
URL: http://eprints.nottingham.ac.uk/35450/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701181
► Discomfort glare is considered to be an annoyance or distraction caused by sources of non-uniform or high luminance within the field of view of an…
(more)
▼ Discomfort glare is considered to be an annoyance or distraction caused by sources of non-uniform or high luminance within the field of view of an observer. There are still significant gaps in our understanding of the conditions that characterise the magnitude and occurrence of discomfort glare, this being especially evident in the presence of large sources of luminance such as windows. The large degree of scatter that is observed when subjective evaluations of glare sensation are compared against calculated glare indices suggests that discomfort glare may be dependent on other variables beyond the physical and photometric parameters that are commonly embedded in glare formulae (e.g., source luminance, source size, background luminance, and position index). There are strong reasons to believe that some of these variables might be linked to the time of day when the observer is exposed to the glare source. In response, this thesis investigated the research hypothesis that subjective glare sensation is associated with temporal variability. This hypothesis was tested in two stages. The first stage was conducted within a laboratory setting, and sought to examine temporal effects under controlled artificial lighting conditions. The collection of temporal variables and personal factors – thereby examining the scatter in glare responses across the independent variable (time of day) and isolating potential confounding variables – enabled to identify factors that could influence the subjective evaluation of glare sensation along the day. Having established the presence of a temporal effect on glare response, the influences detected were further explored within a test room with direct access to daylight, whereby temporal variables and personal factors were measured in conjunction to glare sensation for them to be statistically masked from the analysis. The results confirmed the hypothesis of an increased tolerance to glare as the day progresses. This supported the conclusion that physical and photometric parameters alone are not sufficient for a robust prediction of discomfort glare.
Subjects/Keywords: 697; NA Architecture; TH7700 Illumination. Lighting
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APA (6th Edition):
Kent, M. G. (2016). Temporal effects in glare response. (Doctoral Dissertation). University of Nottingham. Retrieved from http://eprints.nottingham.ac.uk/35450/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701181
Chicago Manual of Style (16th Edition):
Kent, Michael G. “Temporal effects in glare response.” 2016. Doctoral Dissertation, University of Nottingham. Accessed April 10, 2021.
http://eprints.nottingham.ac.uk/35450/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701181.
MLA Handbook (7th Edition):
Kent, Michael G. “Temporal effects in glare response.” 2016. Web. 10 Apr 2021.
Vancouver:
Kent MG. Temporal effects in glare response. [Internet] [Doctoral dissertation]. University of Nottingham; 2016. [cited 2021 Apr 10].
Available from: http://eprints.nottingham.ac.uk/35450/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701181.
Council of Science Editors:
Kent MG. Temporal effects in glare response. [Doctoral Dissertation]. University of Nottingham; 2016. Available from: http://eprints.nottingham.ac.uk/35450/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701181
Louisiana State University
30.
Mohan, Jayesh.
Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation.
Degree: MS, Electrical and Computer Engineering, 2014, Louisiana State University
URL: etd-06022014-134538
;
https://digitalcommons.lsu.edu/gradschool_theses/628
► In this thesis, a novel analysis framework is presented in order to automate testing response of an image-feature descriptor algorithm for face recognition under different…
(more)
▼ In this thesis, a novel analysis framework is presented in order to automate testing response of an image-feature descriptor algorithm for face recognition under different illumination conditions and white balance calibration over intra- and inter-color space. The experimental results on the OPFD database show that our analysis framework finds the least sensitive channel of a color space for recognizing a face under unknown illumination, unknown white balance, and the both unknown illumination and white balance conditions. The results also show the combination of channels in a color space which are best suited face recognition.
Subjects/Keywords: Hybrid color features; Color space; Illumination invariant
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APA ·
Chicago ·
MLA ·
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Export
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Manager
APA (6th Edition):
Mohan, J. (2014). Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation. (Masters Thesis). Louisiana State University. Retrieved from etd-06022014-134538 ; https://digitalcommons.lsu.edu/gradschool_theses/628
Chicago Manual of Style (16th Edition):
Mohan, Jayesh. “Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation.” 2014. Masters Thesis, Louisiana State University. Accessed April 10, 2021.
etd-06022014-134538 ; https://digitalcommons.lsu.edu/gradschool_theses/628.
MLA Handbook (7th Edition):
Mohan, Jayesh. “Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation.” 2014. Web. 10 Apr 2021.
Vancouver:
Mohan J. Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation. [Internet] [Masters thesis]. Louisiana State University; 2014. [cited 2021 Apr 10].
Available from: etd-06022014-134538 ; https://digitalcommons.lsu.edu/gradschool_theses/628.
Council of Science Editors:
Mohan J. Exploring Invariant Hybrid Color Image Features for Face Recognition Under Illumination Variation. [Masters Thesis]. Louisiana State University; 2014. Available from: etd-06022014-134538 ; https://digitalcommons.lsu.edu/gradschool_theses/628
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Open Access Theses and Dissertations