IMAGE ENCODING DEVICE AND METHOD, IMAGE DECODING DEVICE AND METHOD, COMPUTER READABLE RECORDING MEDIUM RECORDING IMAGE ENCODING PROGRAM AND COMPUTER READABLE RECORDING MEDIUM RECORDING IMAGE DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To enhance encoding efficiency by separating a background image from an object moving image, further dividing the moving image into plural kinds of objects and encoding each object with a desired code length. SOLUTION: A code length controlling part 111 calculates the a coding rate R0 of a moving image sequence from a moving image sequence length Ts, the empty capacity C0 of a CD-ROM 114 and a code length Lb that encodes a still image of a VTR 101. An extracting part 108 extracts an object image from the motion of image data, divides it into plural kinds of objects and inputs the information of a specific object a moving image encoding part 110. The finite difference O0 between code length L0 and target value R0 which encode background/object decision results which are simultaneously inputted is calculated and the initial value of a quantization coefficient Q is determined. The mean value (m) of object pixels is calculated from object image data and the background/object decision results, supplied to an encoding and synthesizing part 112 in every block, synthesized with data produced by a still image encoding part 106 and an object extractor 108 and is outputted.