ENCODING DEVICE AND DECODING DEVICE

摘要

PROBLEM TO BE SOLVED: To easily manage memory for prediction information on a decoding device, and optimize the management to enable the reproduction of a larger amount of moving images at the same time.SOLUTION: In an encoding device 1A including picture memory 17 for prediction reference in order to perform prediction encoding to moving image information including a plurality of temporally continuous frames, a reversible compression processing unit 16 calculates a compressibility ratio CR through compression processing performed by the unit in a frame unit and supplies the compressibility ratio to a compressibility ratio update unit 20. When the compressibility ratio update unit 20 receives the input of a compressibility ratio CR smaller than the compressibility ratio CR held therein, updates the compressibility ratio CR held therein to the new compressibility ratio CR and stores the updated compressibility ratio CR. The compressibility ratio update unit 20 performs such processing over the frames constituting single moving images. Thus, by the time of the completion of the processing for a single moving image, the compressibility ratio update unit 20 will have the worst compressibility ratio WCR. The compressibility ratio update unit 20 outputs the worst compressibility ratio WCR to a second variable-length coding unit 21 in a moving image unit.