Image compression method and apparatus using classification vector quantization

摘要

The present invention relates to an image compression method and apparatus capable of enhancing compression encoding efficiency of an image using classification vector quantization. To this end, the present invention relates to a method and apparatus for compressing a difference image signal based on motion estimation and prediction, The DCT coefficient is transformed into a DCT coefficient of 8 8 in the frequency domain, a DCT coefficient is quantized by nonlinear operation, and the quantized 8 8 DCT coefficient block is divided into a plurality of regions having a predetermined size Next, classification vector quantization is performed while matching the patterns of the respective areas partitioned by using the plurality of codebooks respectively corresponding to the plurality of segmented areas of the image encoder and each reference pattern in each codebook, DCT transform coefficients are coded to improve the efficiency of compression coding by suppressing the amount of bits of image data as much as possible The.