標題: Optimal bit allocation for coding of video signals over ATM networks
作者: Chen, JJ
Lin, DW
電子工程學系及電子研究所
電信研究中心
Department of Electronics Engineering and Institute of Electronics
Center for Telecommunications Research
關鍵字: asynchronous transfer mode;allocation;image coding;optimization methods;quantization;rate distortion theory
公開日期: 1-八月-1997
摘要: We consider optimal encoding of video sequences for ATM networks. Two cases are investigated, In one, the video units are coded independently (e.g., motion JPEG), while in the other, the coding quality of a later picture may depend on that of an earlier picture (e.g., H.26x and MPEGx). The aggregate distortion-rate relationship for the latter case exhibits a tree structure, and its solution commands a higher degree of complexity than the former. For independent coding, we develop an algorithm which employs multiple Lagrange multipliers to find the constrained bit allocation, This algorithm is optimal up to a convex-hull approximation of the distortion-rate relations in the case of CBR (constant bit-rate) transmission, It is suboptimal in the case of VER (variable bit-rate) transmission by the use of a suboptimal transmission rate control mechanism for simplicity. For dependent coding, the Lagrange-multiplier approach becomes rather unwieldy, and a constrained tree search method is used. The solution is optimal for both CBR and VER transmission if the full constrained tree is searched, Simulation results are presented which confirm the superiority in coding quality of the encoding algorithms, We also compare the coded video quality and other characteristics of VER and CBR transmission.
URI: http://dx.doi.org/10.1109/49.611155
http://hdl.handle.net/11536/404
ISSN: 0733-8716
DOI: 10.1109/49.611155
期刊: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume: 15
Issue: 6
起始頁: 1002
結束頁: 1015
顯示於類別:期刊論文


文件中的檔案:

  1. A1997XN84300004.pdf