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You searched for +publisher:"University of New Mexico" +contributor:("Christodoulou, Christos G."). One record found.

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University of New Mexico

1. Murray Herrera, Victor Manuel. AM-FM methods for image and video processing.

Degree: Electrical and Computer Engineering, 2009, University of New Mexico

This dissertation is focused on the development of robust and efficient Amplitude-Modulation Frequency-Modulation (AM-FM) demodulation methods for image and video processing (there is currently a patent pending that covers the AM-FM methods and applications described in this dissertation). The motivation for this research lies in the wide number of image and video processing applications that can significantly benefit from this research. A number of potential applications are developed in the dissertation. First, a new, robust and efficient formulation for the instantaneous frequency (IF) estimation: a variable spacing, local quadratic phase method (VS-LQP) is presented. VS-LQP produces much more accurate results than current AM-FM methods. At significant noise levels (SNR < 30dB), for single component images, the VS-LQP method produces better IF estimation results than methods using a multi-scale filterbank. At low noise levels (SNR > 50dB), VS-LQP performs better when used in combination with a multi-scale filterbank. In all cases, VS-LQP outperforms the Quasi-Eigen Approximation algorithm by significant amounts (up to 20dB). New least squares reconstructions using AM-FM components from the input signal (image or video) are also presented. Three different reconstruction approaches are developed: (i) using AM-FM harmonics, (ii) using AM-FM components extracted from different scales and (iii) using AM-FM harmonics with the output of a low-pass filter. The image reconstruction methods provide perceptually lossless results with image quality index values bigger than 0.7 on average. The video reconstructions produced image quality index values, frame by frame, up to more than 0.7 using AM-FM components extracted from different scales. An application of the AM-FM method to retinal image analysis is also shown. This approach uses the instantaneous frequency magnitude and the instantaneous amplitude (IA) information to provide image features. The new AM-FM approach produced ROC area of 0.984 in classifying Risk 0 versus Risk 1, 0.95 in classifying Risk 0 versus Risk 2, 0.973 in classifying Risk 0 versus Risk 3 and 0.95 in classifying Risk 0 versus all images with any sign of Diabetic Retinopathy. An extension of the 2D AM-FM demodulation methods to three dimensions is also presented. New AM-FM methods for motion estimation are developed. The new motion estimation method provides three motion estimation equations per channel filter (AM, IF motion equations and a continuity equation). Applications of the method in motion tracking, trajectory estimation and for continuous-scale video searching are demonstrated. For each application, we discuss the advantages of the AM-FM methods over current approaches. Advisors/Committee Members: Pattichis, Marios S., Pattichis, Marios S., Christodoulou, Christos G., Jordan, Ramiro, Hagstrom, Thomas M..

Subjects/Keywords: Image processing – Digital techniques; Demodulation (Electronics); Digital video.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Murray Herrera, V. M. (2009). AM-FM methods for image and video processing. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/7633

Chicago Manual of Style (16th Edition):

Murray Herrera, Victor Manuel. “AM-FM methods for image and video processing.” 2009. Doctoral Dissertation, University of New Mexico. Accessed July 23, 2019. http://hdl.handle.net/1928/7633.

MLA Handbook (7th Edition):

Murray Herrera, Victor Manuel. “AM-FM methods for image and video processing.” 2009. Web. 23 Jul 2019.

Vancouver:

Murray Herrera VM. AM-FM methods for image and video processing. [Internet] [Doctoral dissertation]. University of New Mexico; 2009. [cited 2019 Jul 23]. Available from: http://hdl.handle.net/1928/7633.

Council of Science Editors:

Murray Herrera VM. AM-FM methods for image and video processing. [Doctoral Dissertation]. University of New Mexico; 2009. Available from: http://hdl.handle.net/1928/7633

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