IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODER, IMAGE DECODER AND, THEIR PROGRAMS

摘要

PROBLEM TO BE SOLVED: To reduce the amount of codes or improve the image quality by generating a prediction image in which prediction residual is reduced.

SOLUTION: The image encoder 100 treats an area having a similar image signal in a block as a subject for each block to be encoded, and determines subject identification information of each pixel and a pixel value representing each subject according to the number of subjects set by a number of subjects setting unit 103. They are encoded by a subject map encoding unit 107 and a subject pixel value encoding unit 105. A prediction image generated in a prediction image generation unit 108 is obtained by replacing each pixel in the block by a closest pixel value among pixel values representing respective subjects, and an image signal encoding unit 109 encodes the prediction residual of a current image and the prediction image.

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