Method and apparatus for MV scaling with increased effective scaling ratio
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United States of America Patent
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Jan 23, 2018
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Mar 24, 2017
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Nov 7, 2011
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Abstract
A method and apparatus for deriving a scaled motion vector (MV) for a current block based on a candidate MV associated with a candidate block determines a first picture distance between a current picture corresponding to the current block and a target reference picture pointed to by a current motion vector of the current block, and then determines a second picture distance between a candidate picture corresponding to the candidate block and a candidate reference picture pointed to by the candidate MV of the candidate block. The method further determines a pre-scaled distance division having a first value related to dividing a pre-scaling factor by the second picture distance, and determines an intermediate scaling factor by right-shifting a multiplication result associated with the first picture distance and the pre-scaled distance division by q bits, wherein q is a positive integer.
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