tailieunhanh - Báo cáo hóa học: " Multiple Description Wavelet Coding of Layered Video Using Optimal Redundancy Allocation"

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: Multiple Description Wavelet Coding of Layered Video Using Optimal Redundancy Allocation | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 83542 Pages 1-19 DOI ASP 2006 83542 Multiple Description Wavelet Coding of Layered Video Using Optimal Redundancy Allocation Nikolaos V. Boulgouris 1 Konstantinos E. Zachariadis 2 Angelos Kanlis 3 and Michael G. Strintzis4 5 1 Department of Electronic Engineering Division of Engineering King s College London WC2R2LS London United Kingdom 2 The Kellogg School of Management Northwestern University IL 60208 USA 3 The European Patent Office Munich 80298 Germany 4 The Informatics and Telematics Institute Thessaloniki GR-57001 Greece 5 The Electrical and Computer Engineering Department of the University of Thessaloniki Thessaloniki GR-54124 Greece Received 2 March 2005 Revised 30 August 2005 Accepted 1 September 2005 We present a wavelet-based framework for the encoding of video in multiple descriptions. Using the proposed methodology the generation of multiple descriptions is performed so that drift is eliminated at the decoder regardless of the number of received descriptions. Moreover the proposed framework is flexible in the sense that it allows the encoding of video into an arbitrary number of descriptions. We also present a thorough analysis of rate allocation issues and propose three algorithms for the optimal allocation of redundancy. Experimental results for the transmission of video using two descriptions demonstrate the efficiency of the proposed method. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Multiple description MD coding 1 2 offers an attractive framework for the transmission of multimedia over heterogeneous networks. In MD coding a source is encoded into multiple independently decodable bitstreams which are mutually refining and equally important. At the decoder side the reconstruction quality is dependent on the number of descriptions that was errorlessly received. Due to its flexibility multiple .