| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve compression efficiency of an amount of codes with an image decoding method using movement compensation prediction by a geometrical conversion. <P>SOLUTION: A decoding part decodes prediction method information included in a coding stream coded using a movement compensation prediction by geometrical conversion and for specifying a prediction mode, a differential movement vector of representative pixels according to the prediction mode, and a prediction error signal. A geometrical conversion movement compensation prediction part 205 creates prediction signals from a movement vector of representative pixels between an object block in an object image and a reference block in a reference image having a relationship geometrically converted from the object block, the movement vector of the pixel other than the representative pixel by interpolation using the movement vector of the representative pixel, and image signals of the reference block. An pixel positioned at an apex constituting the object block, a pixel positioned near the pixel, or a complementary pixel positioned near the apex is selected as the representative pixel. <P>COPYRIGHT: (C)2012,JPO&INPIT |
