IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING APPARATUS, IMAGE DECODING APPARATUS, IMAGE ENCODING PROGRAM, AND IMAGE DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To generate a predictive image in which a predictive residual decreases, and realize a reduction in encoding amount or an improvement in image quality.

SOLUTION: For each block to be encoded, an image encoding apparatus 100 treats, as a subject, a region that has similar image signals in the block, and sets one pixel value representing each subject as a subject pixel value in association with a subject identifier. A subject map generating unit 105 generates a subject map in which subject identifiers indicate to which subject each pixel in the block belongs. By using the subject map, a predictive image generating unit 108 generates a predictive image for use in predicting the block to be encoded. A subject map encoding unit 107 encodes the subject map by referring to the subject map, which is used in encoding an encoded reference region.

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