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Báo cáo hóa học: " Distributed Coding of Highly Correlated Image Sequences with Motion-Compensated Temporal Wavelets"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Distributed Coding of Highly Correlated Image Sequences with Motion-Compensated Temporal Wavelets | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 46747 Pages 1-10 DOI 10.1155 ASP 2006 46747 Distributed Coding of Highly Correlated Image Sequences with Motion-Compensated Temporal Wavelets Markus Flierl1 and Pierre Vandergheynst2 1 Max Planck Center for Visual Computing and Communication Stanford University Stanford CA 94305 USA 2 Signal Processing Institute Swiss Federal Institute of Technology Lausanne 1015 Lausanne Switzerland Received 21 March 2005 Revised 27 September 2005 Accepted 4 October 2005 This paper discusses robust coding of visual content for a distributed multimedia system. The system encodes independently two correlated video signals and reconstructs them jointly at a central decoder. The video signals are captured from a dynamic scene where each signal is robustly coded by a motion-compensated Haar wavelet. The efficiency of the decoder is improved by a disparity analysis of the first image pair of the sequences followed by disparity compensation of the remaining images of one sequence. We investigate how this scene analysis at the decoder can improve the coding efficiency. At the decoder one video signal is used as side information to decode efficiently the second video signal. Additional bitrate savings can be obtained with disparity compensation at the decoder. Further we address the theoretical problem of distributed coding of video signals in the presence of correlated video side information. We utilize a motion-compensated spatiotemporal transform to decorrelate each video signal. For certain assumptions the optimal motion-compensated spatiotemporal transform for video coding with video side information at high rates is derived. It is shown that the motion-compensated Haar wavelet belongs to this class of transforms. Given the correlation of the video side information the theoretical bitrate reduction for the distributed coding scheme is investigated. Interestingly the efficiency of .