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

摘要

An image decoding method for decoding an image that is segmented into a plurality of blocks. In said image decoding method: decoded information from decoded blocks is obtained from a storage means that stores both decoded information from decoded blocks in an image being decoded and decoded information from each block in decoded images; a decoded image is selected from among a plurality of decoded images such that the image being decoded lies between said decoded image and a reference image for said decoded image; decoded information from a prescribed block in the selected decoded image is obtained from the storage means; the obtained decoded information from decoded blocks and decoded information from a prescribed block is used to predict a reference mode which indicates the prediction direction of a block to be decoded, said block being capable of referring to decoded images in a plurality of directions; reference-mode information for determining the reference mode is decoded from encoded data; and the reference mode of the block to be decoded is determined from the predicted reference mode and the decoded reference-mode information.