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dct transform coding of stereo images for multimedia applications

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 1998年第1期45卷 38-43页

作者： Moellenhoff, MS Maier, MW Hughes Missile Syst Co Tucson AZ 85734 USA Univ Alabama Dept Elect & Comp Engn Huntsville AL 35899 USA

One form of multimedia finding increasing utility in factory automation Is stereo imaging, Its uses include remote operation, telepresence, and object positioning, Stereo imaging, with doubled frames, requires high data-rate collection and transmission, Image compression techniques can be utilized to reduce the transmission bandwidth and/or storage space requirements of the stereo pair, This paper develops image compression techniques specific to stereo imaging and compares performance with nonstereo methods. Disparity compensated residual image coding exploits the redundancy between the tno images in a stereo pair, Stereo residuals possess special features that can be exploited within a discrete cosine transform (dct) image coding framework. Use of these features results in several decibels of performance enhancement across a range of scene types. This approach provides its best performance below 0.75 b/pixel bitrate for 8-b grayscale imagery and below 2 b/pixel for 24-b color imagery.

关键词： dct and wavelet residual coding directional structure disparity compensation residual characterization residual image coding stereo image compression

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Characteristics of disparity-compensated stereo image pair residuals

引用

SIGNAL PROCESSING-IMAGE COMMUNICATION 1998年第1-2期14卷 55-69页

作者： Moellenhoff, MS Maier, MW Raytheon Missile Syst Co Image Proc Dept Tucson AZ 85734 USA Univ Alabama ECE Dept Huntsville AL 35899 USA

An emerging feature of multimedia and tele-presence systems is stereo imagery. Stereo images provide an enhanced sense of presence, and have been found to be operationally useful in tasks requiring remote manipulation or judgment of spatial relationships. A conventional stereo system with a single left-right pair needs twice the raw data as a monoscopic imaging system. A multi-view stereo system may require hundreds of times as much. As a result there has been increasing attention given to image compression methods specialized to stereo pairs. Most of this work has focused on disparity-compensated residual coding where one view is used to predict another, and the difference is coded. Much of this work has concentrated on improving the disparity compensation process and codes the residual image similarly to a monoscopic image. As this paper will show, the disparity-compensated residual image differs in important ways from a conventional monoscopic image. The residual image has different correlation characteristics, and is composed primarily of strong vertical-direction edge components surrounded by large areas of near zero intensity. This paper demonstrates these properties, both theoretically and experimentally, and outlines how they might be exploited in designing compression algorithms. Other papers demonstrate that greater than 2 dB improvement is possible when exploiting such characteristics for stereo image compression. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

关键词： stereo image compression residual image coding disparity-compensated residual image characterization dct and wavelet residual coding directional structure

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