Title :
Rate-distortion optimization for video compression
Author :
Sullivan, Gary J. ; Wiegand, Thomas
Author_Institution :
PictureTel Corp., Andover, MA, USA
fDate :
11/1/1998 12:00:00 AM
Abstract :
The rate-distortion efficiency of video compression schemes is based on a sophisticated interaction between various motion representation possibilities, waveform coding of differences, and waveform coding of various refreshed regions. Hence, a key problem in high-compression video coding is the operational control of the encoder. This problem is compounded by the widely varying content and motion found in typical video sequences, necessitating the selection between different representation possibilities with varying rate-distortion efficiency. This article addresses the problem of video encoder optimization and discusses its consequences on the compression architecture of the overall coding system. Based on the well-known hybrid video coding structure, Lagrangian optimization techniques are presented that try to answer the question: what part of the video signal should be coded using what method and parameter settings?
Keywords :
data compression; optimisation; rate distortion theory; video coding; Lagrangian optimization; compression architecture; efficiency; high-compression video coding; hybrid video coding structure; motion representation; operational control; parameter settings; rate-distortion efficiency; rate-distortion optimization; refreshed regions; video compression; video encoder optimization; video sequences; video signal; waveform coding; Bit rate; Entropy coding; ISO; Motion compensation; Quantization; Rate-distortion; Switches; Video codecs; Video coding; Video compression;
Journal_Title :
Signal Processing Magazine, IEEE