| 摘要 |
A motion vector estimation circuit ( 101 ) interpolates, with sub-pixel precision, a prediction block indicated by a motion vector estimated with integer-pixel precision as well as a region around the prediction block within a search area in a reference picture, using a 2 -tap pixel interpolator ( 605 ), and estimates two or more motion vectors indicating positions of prediction blocks having high correlation with a current block to be coded, within the interpolated region. A motion compensation circuit ( 102 ) interpolates, with sub-pixel precision, each of the prediction blocks indicated by the estimated motion vectors, using a 6 -tap pixel interpolator ( 901 ), compares the coding costs of the interpolated prediction blocks, and determines a motion vector indicating a position of a prediction block having highest correlation with the current block, from among the estimated motion vectors. As mentioned above, the number of motion vector candidates is narrowed down by sub-pixel precision motion prediction using a reference image created by a 2 -tap filter, and then motion compensation is performed on these motion vector candidates using a 6 -tap filter. Therefore, it becomes possible to achieve moving picture compression performance as high as sub-pixel precision motion prediction using a reference image created by a 6 -tap filter.
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