DATA COMPRESSING DEVICE AND METHOD, DATA EXPANDING DEVICE AND METHOD, DATA COMPRESSING/EXPANDING SYSTEM AND METHOD, CODE BOOK MAKING METHOD, AND RECORDING MEDIUM

PROBLEM TO BE SOLVED: To reproduce data with high quality on the basis of compressed data by realizing image or voice data compression with a high compression rate. SOLUTION: A correlation ratio calculation section 36 quantizes the vectors of each frame of a moving picture by using a space direction code book. A space direction code book reconstruction calculating section 39 rearranges the obtained code string to generate new vectors. The correlation ratio calculation section 36 quantizes the new vectors by using a time-axis code book. In such a way, not only vector quantization in the space direction is performed for each frame image, but also vector quantization in the time-axis direction is performed between frames along the time axis. Thus, the data compression apparatus or the like is characterized in that data compression is applied between frames so as to compress a moving picture at a high compression rate while keeping the quality of a reproduced image. COPYRIGHT: (C)2005,JPO&NCIPI