IMAGE ENCODING DEVICE, IMAGE ENCODING METHOD AND IMAGE ENCODING PROGRAM, AS WELL AS IMAGE DECODING DEVICE, IMAGE DECODING METHOD AND IMAGE DECODING PROGRAM

摘要

In the present invention, an intra-prediction mode selection unit (509) selects an intra-screen prediction mode for a block to be encoded. A priority prediction mode list creation unit (602), using intra-screen prediction modes for a plurality of reference blocks, creates a list of priority prediction modes having a predetermined number of elements for any of the blocks to be encoded regardless of the number of different intra-screen prediction modes for a plurality of encoded blocks. A priority prediction mode index calculation unit (605), if the intra-screen prediction mode of the block to be encoded is a priority prediction mode, calculates information for identifying the priority prediction mode in accordance with the list. A non-priority prediction mode index calculation unit (607), if the intra-screen prediction mode of the block to be encoded is a non-priority prediction mode, calculates information for identifying the non-priority prediction mode on the basis of the list.