VIDEO ENCODING DEVICE, VIDEO DECODING DEVICE, VIDEO SYSTEM, VIDEO ENCODING METHOD, VIDEO DECODING METHOD, AND PROGRAM

摘要

The number of reference pixels to be referenced in order to reduce redundancy among color components is to be reduced, while suppressing degradation in encoding performance. An intra prediction unit (20A) that performs intra-frame prediction includes an adaptive-sub-sampling luma reference pixel acquisition unit (21A) and an adaptive-sub-sampling chroma reference pixel acquisition unit (22A). In the case where an input image a is an image of a non-YUV420 format and the encoding unit is the smallest CU block, the adaptive-sub-sampling luma reference pixel acquisition unit (21A) sub-samples reference pixels existing neighboring a luma block corresponding to a chroma prediction target block based on a luma intra prediction mode, and acquires a pixel value of each of the sub-sampled reference pixels. In the case where the input image a is an image of a non-YUV420 format and the encoding unit is the smallest CU block, the adaptive-sub-sampling chroma reference pixel acquisition unit (22A) sub-samples reference pixels existing neighboring the chroma prediction target block based on the luma intra prediction mode, and acquires a pixel value of each of the sub-sampled reference pixels.