Methods and apparatus for adaptively choosing a search range for motion estimation
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United States of America Patent
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Sep 13, 2016
Grant Date -
Dec 19, 2013
app pub date -
May 16, 2013
filing date -
Jul 3, 2009
priority date (Note) -
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Abstract
Systems, methods, and computer program products that can be used to determine a search range (SR) when performing motion estimation at, for example, a video encoder or decoder. Determining a motion vector for a current block during motion estimation may involve searching within a search window that may reside in a reference frame, or in a previously decoded block that spatially or temporally neighbors the current block. Such a search seeks a motion vector that minimizes a metric, such as a sum of absolute differences between corresponding blocks of reference frames. A motion vector that minimizes such a metric may be a good candidate for use in motion estimation. The search may become more efficient if a search range is determined such that the extent of the search is bounded. A search range may be determined at the block level or at the picture level.
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