CONTEXT REDUCTION OF SIGNIFICANCE MAP CODING OF 4X4 AND 8X8 TRANSFORM COEFFICIENT IN HM4.0
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United States of America Patent
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Apr 25, 2013
app pub date -
Oct 17, 2012
filing date -
Oct 19, 2011
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Abstract
Reducing contexts of a significance map includes merging some of the adjacent partitions of the higher frequency transform coefficients into one partition so that the significance of the coefficients in a merged partition are encoded with the same contexts. To reduce the impact of merging on coding efficiency of 4×4 blocks, the partitions of the lower frequency AC components of 4×4 blocks are not merged. To reduce the impact of merging on coding efficiency, the DC component is not merged with any AC component.
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