DYNAMIC-IMAGE CODING DEVICE, DYNAMIC-IMAGE DECODING DEVICE, DYNAMIC-IMAGE CODING METHOD, DYNAMIC-IMAGE DECODING METHOD, AND PROGRAM

摘要

An intra prediction unit 20A that performs intra-frame prediction includes a luminance reference pixel acquisition unit 21A and a chrominance reference pixel acquisition unit 22A. When the coding unit is set to a smallest CU block, the luminance reference pixel acquisition unit 21A subsamples reference pixels arranged at integer pixel positions around a luminance block that corresponds to a chrominance prediction target block, and acquires the pixel values of the reference pixels after the subsampling. Furthermore, when the coding unit is set to a smallest CU block, the chrominance reference pixel acquisition unit 22A subsamples reference pixels arranged at integer pixel positions around the chrominance prediction target block, and acquires the pixel values of the reference pixels after the subsampling. Such an arrangement is capable of reducing the number of reference pixels used to reduce the redundancy between the color components.