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: Research Article Improved Side Information Generation for Distributed Video Coding by Exploiting Spatial and Temporal Correlations | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2009 Article ID 683510 15 pages doi 2009 683510 Research Article Improved Side Information Generation for Distributed Video Coding by Exploiting Spatial and Temporal Correlations Shuiming Ye Mourad Ouaret Frederic Dufaux and Touradj Ebrahimi EURASIP Member Institute of Electrical Engineering Ecole Polytechnique Federale de Lausanne EPFL 1015 Lausanne Switzerland Correspondence should be addressed to Shuiming Ye shuiming@ Received 22 May 2008 Revised 15 October 2008 Accepted 14 December 2008 Recommended by Stefano Tubaro Distributed video coding DVC is a video coding paradigm allowing low complexity encoding for emerging applications such as wireless video surveillance. Side information SI generation is a key function in the DVC decoder and plays a key-role in determining the performance of the codec. This paper proposes an improved SI generation for DVC which exploits both spatial and temporal correlations in the sequences. Partially decoded Wyner-Ziv WZ frames based on initial SI by motion compensated temporal interpolation are exploited to improve the performance of the whole SI generation. More specifically an enhanced temporal frame interpolation is proposed including motion vector refinement and smoothing optimal compensation mode selection and a new matching criterion for motion estimation. The improved SI technique is also applied to a new hybrid spatial and temporal error concealment scheme to conceal errors in WZ frames. Simulation results show that the proposed scheme can achieve up to dB improvement in rate distortion performance in WZ frames for video with high motion when compared to state-of-the-art DVC. In addition both the objective and perceptual qualities of the corrupted sequences are significantly improved by the proposed hybrid error concealment scheme outperforming both spatial and temporal concealments alone. Copyright 2009 Shuiming Ye et
