MOTION VECTOR DETECTION CIRCUIT, MOVING IMAGE ENCODING APPARATUS, AND MOTION VECTOR DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To perform appropriate motion vector detection with a small cache capacity.

SOLUTION: A reduction motion vector detection section 11b detects reduction motion vectors within a first search range and a second search range smaller than the first search range, and a degree of image similarity based on the reduction motion vectors, in each of a plurality of reduction reference frames. A reference frame determination section 11c determines reference frames and the number of reference frames based on a value obtained by integrating the degree of similarity for an overall reduction encoding target frame. A data holding section 11d holds image data for reference frames within a range which is set based on the size of either the first or second search range in accordance with the determined number of reference frames. A motion vector detection section 11e detects a motion vector based on the image data held by the data holding section 11d and the detected reduction motion vectors for a non-magnified encoding target frame.

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