IMAGE DECODING DEVICE, MOTION VECTOR DECODING METHOD, IMAGE ENCODING DEVICE, AND MOTION VECTOR ENCODING METHOD

摘要

In the present invention, a reversible decoding unit (52) acquires, from compressed image information, horizontal predicted block information indicating a block wherein motion vector information has been selected as horizontal predicted motion vector information from a block to be decoded and an adjacent block that has been decoded, and vertical predicted block information indicating a block wherein motion vector information has been selected as vertical predicted motion vector information. A predicted motion vector information setting unit (73) sets motion vector information of the block indicated by the horizontal predicted block information as horizontal predicted motion vector information, and sets motion vector information of the block indicated by the vertical predicted block information as vertical predicted motion vector information. Using the set horizontal predicted motion vector information and vertical predicted motion vector information, the motion vector information generating unit of a motion compensation unit (72) generates motion vector information of the block to be decoded. As a result, encoding efficiency is increased.