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Abstract

A motion estimation device that reduces computational complexity while maintaining high prediction performance includes: block search means searching for a reference block that most approximates a prediction target block within a search range in a past direction frame F (−) or in a future direction frame F (+); search center setting means setting a search center in F (−) and F (+); and search range setting means setting a search range around the search center in F (−) and F (+), wherein the search range setting means sets a relatively large or small search range when F (0) is a P frame and switches assignment of large and small search ranges sequentially between two neighboring prediction target blocks, and the search center setting means sets a position identified by a motion vector predictor as a search center for a frame to which the relatively small search range is assigned.

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First Claim