A bit rate reduction technique for vector quantization image data compression

摘要

In this paper, a technique to reduce the over- head of Vector Quantization(VQ)coding is developed here. Our method exploits the inter-index correlation property to reduce the overhead to transmit encoded indices. Discrete Cosine Trans- form(DCT)is the tool to decorrelate the above correlation to get further bit rate reduction. As we know, the codewords in the codebook that generated form conventional LBG algorithm do not have any specified orders. Hence, the indices for selected codeworks to represent respective adjacent blocks are random distributions.