Method, apparatus and system for encoding and decoding the significance map for residual coefficients of a transform unit
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United States of America Patent
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Jul 18, 2017
Grant Date -
Apr 18, 2013
app pub date -
Oct 18, 2012
filing date -
Oct 18, 2011
priority date (Note) -
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Abstract
Decoding includes identifying a scan pattern by which the bitstream is decoded. A set index value is decoded from the bitstream that specifies a set of flags according to the scan pattern that contains a last significant coefficient flag of the significance map, and individual significance flags are decoded and the decoded values written into the significance map according to the scan pattern and including the specified set of flags. Encoding a significance map includes identifying a scan pattern by which the significance map is scanned to form a list of significant coefficient flags. Encoding identifies a group of significant coefficient flags including a last significant coefficient flag and referencing the identified group with a scan index value. The significance map is then scanned in accordance with the scan pattern up to and including an entirety of the identified group and the scanned flag values then encoded.
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