A NOVEL VQ CODEBOOK DESIGN TECHNIQUE

In this paper, we present an approach to increase the amount of Ve cod ebook patterns to improve image quality without a large overhead on th e codebook memory and search time. Basically, our approach characteriz es a pattern into a key value, which is used in codebook search; ''Ref lection operation'' was performed on codewords using the key values to get more patterns to improve image quality. Our basic Ve system is a 2-step ye where Ve is used to compress prediction errors resulting fro m simple scalar quantization of pixel blocks. The codebook search time for our technique is O(logN+K) for each input vector, where N is the codebook size and K is the Voronoi's range. Experimental results are p resented in the paper.