Structure Mediated Use of Local-Global Duality in Image and Video Processing
Ratakonda, Krishna Chaitanya
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https://hdl.handle.net/2142/81297
Description
Title
Structure Mediated Use of Local-Global Duality in Image and Video Processing
Author(s)
Ratakonda, Krishna Chaitanya
Issue Date
1999
Doctoral Committee Chair(s)
Ahuja, Narendra
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
An image can have multiple representations, each of which has its own advantages and disadvantages from the perspective of image processing operations. This thesis investigates how to combine multiple representations with efficient optimization techniques so as to gather together their combined strengths in improving both objective and perceptual quality of the processed image. In many of the applications that we consider, global smoothness properties of the image are captured by linear transform-based representations while local edge-based properties are captured with a segmentation algorithm. Applications used to justify the efficacy of such an approach include lossless image compression, lossy video compression, denoising AWGN corrupted images and image magnification. It is found that many of the traditional unirepresentational processing techniques are special cases of the general multirepresentational formulations that are presented in this thesis.
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