MOVING IMAGE ENCODING APPARATUS, MOVING IMAGE DECODING APPARATUS, MOVING IMAGE ENCODING METHOD, MOVING IMAGE DECODING METHOD, MOVING IMAGE ENCODING PROGRAM, MOVING IMAGE DECODING PROGRAM, AND MOVING IMAGE ENCODING/DECODING SYSTEM.

摘要

In encoding/decoding of moving images, the efficiency of encoding is enhanced and the expansion is facilitated, while the increases in the capacities of frame memories and in bands are suppressed.  A bit length expanding converter (102) converts a target image, the pixel values of which are expressed by use of a bit length N, to an image the pixel values of which are expressed by use of a bit length M.  A compressor (110) encodes the image as converted.  A decompressor (111) decompresses the image as encoded.  A bit length contracting converter (113) converts the image as decompressed to a reproduced image the pixel values of which are expressed by use of a bit length L shorter than the bit length M.  The reproduced image is then stored, as a reference image, into a frame memory (114).