TAILIEUCHUNG - Báo cáo hóa học: " Least-Square Prediction for Backward Adaptive Video Coding"

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: Least-Square Prediction for Backward Adaptive Video Coding | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article 1D90542 Pages 1-13 DOI ASP 2006 90542 Least-Square Prediction for Backward Adaptive Video Coding XinLi Lane Department of Computer Science and Electrical Engineering West Virginia University Morgantown WV26506 USA Received 27 July 2005 Revised 7 February 2006 Accepted 26 February 2006 Almost all existing approaches towards video coding exploit the temporal redundancy by block-matching-based motion estimation and compensation. Regardless of its popularity block matching still reflects an ad hoc understanding of the relationship between motion and intensity uncertainty models. In this paper we present a novel backward adaptive approach named leastsquare prediction LSP and demonstrate its potential in video coding. Motivated by the duality between edge contour in images and motion trajectory in video we propose to derive the best prediction of the current frame from its causal past using least-square method. It is demonstrated that LSP is particularly effective for modeling video material with slow motion and can be extended to handle fast motion by temporal warping and forward adaptation. For typical QCIF test sequences LSP often achieves smaller MSE than 4 X 4 full-search quarter-pel block matching algorithm BMA without the need of transmitting any overhead. Copyright 2006 Xin Li. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Motion plays a fundamental role in video coding. Motion compensated prediction MCP 1 represents the most popular approach towards exploiting the temporal redundancy in video signals. In hybrid MCP coding 2 a motion vector MV field is estimated and transmitted to the decoder and motion compensation MC is the key element in removing temporal redundancy. In the past .

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