IMAGE DECODING METHOD, IMAGE ENCODING METHOD, IMAGE DECODING DEVICE, IMAGE ENCODING DEVICE, AND IMAGE ENCODING/DECODING DEVICE

摘要

An image decoding method that decodes, by block, image data included in an encoded bit stream, for each block, and includes: a merge candidate acquisition step in which a fixed number of at least two merge candidates are obtained, said merge candidates being candidates for the prediction direction, motion vector, and reference picture index referenced during decoding of the block to be decoded; and an index acquisition step in which an index for specifying the merge candidates for the block to be decoded is obtained from the encoded bit stream. The fixed number of at least two merge candidates comprise: at least one first candidate derived on the basis of the prediction direction, motion vector, and reference picture index used for decoding an adjacent block spatially or temporally adjacent to the block to be decoded; and at least one second candidate having a predetermined fixed value.