| 摘要 |
A lossless decoding unit 52 obtains, from compressed image information, predicted horizontal block information indicating a block having motion vector information selected as predicted horizontal motion vector information from decoded blocks adjacent to a current block to be decoded, and predicted vertical block information indicating a block having motion vector information selected as predicted vertical motion vector information from the decoded adjacent blocks. A predicted motion vector information setting unit 73 sets the motion vector information about the block indicated by the predicted horizontal block information as the predicted horizontal motion vector information, and sets the motion vector information about the block indicated by the predicted vertical block information as the predicted vertical motion vector information. Using the set predicted horizontal motion vector information and predicted vertical motion vector information, a motion vector information generation unit of a motion compensation unit 72 generates motion vector information about the current block to be decoded. In this manner, encoding efficiency is increased.
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