| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase compression efficiency of a coding amount by an image coding system using motion compensation prediction based on translation and motion compensation prediction based on geometrical conversion in combination. <P>SOLUTION: A decoding unit 250 decodes prediction method information, a motion vector, and a prediction error signal included in coding stream. A change control unit 214 refers to the prediction method information decoded by the decoding unit 250, and designates use of one of a prediction method by a translational motion compensation prediction unit 204 and a prediction method by a geometrical conversion motion compensation prediction unit 205 for each target block inside a target image. The decoding unit 250 decodes the motion vector of a predictively coded target block by referring to the motion vector of an adjacent block regardless of the motion compensation prediction method of the adjacent block. <P>COPYRIGHT: (C)2011,JPO&INPIT |
