AN EFFICIENT FAST ENCODING ALGORITHM FOR VECTOR QUANTIZATION

IntroductionAs an effective technique for data compression,VQ[1,2 ] has been successfully used forvarious ap-plications involving VQ- based encoding and VQ-based recognition in both vocal and image pro-cessing.The k- dimensional,N- level vectorquantizer is defined as a mapping from a k- di-mensional Euclidean space Rkinto a certain finitesubset C={Ci,i=1 ,2 ,… ,N },which is called acodebook and whose elements Ci are called code-words.A distortion measure D( X,Ci) is a non-negative dissi…     

JT6890W／JT6890型高级公路客车的开发

ＪＴ６８９０Ｗ／ＪＴ６８９０型高级公路客车是国家经贸委下达的重点技术开发项目，本文简要介绍了该产品研制过程中解决的主要技术问题和市场应用前景等。     

FAST IMAGE ENCODING ALGORITHM BASED ON MEAN-MATCH CORRELATION VECTOR QUANTIZATION

Introduction　　 Vector quantization (VQ) is an importanttechnique for image compression,and has beenproven to be simple and efficient[1,2 ] .Signal com-pression is achieved in VQ by using a codebookwith relatively few codevectors compared to thenumber of possible signal vectors. VQ can beviewed as a mapping from k- dimensional Euclideanspace Rk into a finite subset C of Rk.We call thisfinite set C the codebook and,moreover,C={ci|i= 1 ,2 ,… ,N},where ci is a codeword and N is thecodeboo…     

AN EFFICIENT BTC IMAGE COMPRESSION ALGORITHM

IntroductionBlock truncation coding( BTC) [1] is a simple andfast lossy image coding technique,which has theadvantage of being easy to implement comparedto transform coding and vector quantization[2 ] .Its simplicity,performance and channel error re-sisting capability make it attractive in the real-time image transmission.BTC is a one- bit adap-tive moment- preserving quantizer that preservescertain statistical moments of small blocks of theinput image in the quantized output.The origi-nal …