tailieunhanh - Báo cáo hóa học: " Research Article A Motion-Compensated Overcomplete Temporal Decomposition for Multiple Description Scalable 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: Research Article A Motion-Compensated Overcomplete Temporal Decomposition for Multiple Description Scalable Video Coding | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID 31319 12 pages doi 2007 31319 Research Article A Motion-Compensated Overcomplete Temporal Decomposition for Multiple Description Scalable Video Coding Christophe Tillier Teodora Petrisor and Beatrice Pesquet-Popescu Signal and Image Processing Department Ecole Nationale Superieure des Telecommunications ENST 46 Rue Barrault 75634 Paris Cédex 13 France Received 26 August 2006 Revised 21 December 2006 Accepted 23 December 2006 Recommended by James E. Fowler We present a new multiple-description coding MDC method for scalable video designed for transmission over error-prone networks. We employ a redundant motion-compensated scheme derived from the Haar multiresolution analysis in order to build temporally correlated descriptions in a t 2D video coder. Our scheme presents a redundancy which decreases with the resolution level. This is achieved by additionally subsampling some of the wavelet temporal subbanbds. We present an equivalent four-band lifting implementation leading to simple central and side decoders as well as a packet-based reconstruction strategy in order to cope with random packet losses. Copyright 2007 Christophe Tillier et al. 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 With the increasing usage of the Internet and other besteffort networks for multimedia communication there is a stringent need for reliable transmission. For a long time the research efforts have been concentrated on enhancing the existing error correction techniques but during the last decades an alternative solution has emerged and is gaining more and more popularity. This solution mainly answers the situation in which immediate data retransmission is either impossible network congestion or broadcast