| 摘要 |
A matching section performs motion estimation upon a predetermined processing unit of input video (p) by, e.g., an iterative gradient method. A motion vector (v) obtained by the iterative gradient method is obtained by the expression v=alpha.Deltav+v<SUB>0 </SUB>(wherein v<SUB>0 </SUB>indicates an initial displacement motion vector and Deltav indicates a differential vector). A characteristic amount extraction section extracts a characteristic amount from the distribution of motion vectors obtained by the motion estimation. A parameter determination section determines a conversion parameter alpha applied to the next processing unit by the characteristic amount. If the characteristic amount is equal to or larger than a predetermined threshold, the conversion parameter alpha is determined to be larger (e.g., alpha=1). If the characteristic amount is smaller than the threshold, the conversion parameter alpha is determined to be smaller (e.g., alpha=0.1).
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