Multi-level significance maps for encoding and decoding

  • US 8,964,849 B2
  • Filed: 11/01/2011
  • Issued: 02/24/2015
  • Est. Priority Date: 11/01/2011
  • Status: Active Grant
First Claim
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1. A method of reconstructing significant-coefficient flags for a transform unit from a bitstream of encoded data, the method comprising:

  • reconstructing significant-coefficient-group flags, wherein the transform unit is partitioned into non-overlapping blocks, each block containing a respective group of significant-coefficient flags, and wherein each significant-coefficient-group flag corresponds to a respective block and its respective group of significant-coefficient flags; and

    reconstructing each significant-coefficient flag byif the significant-coefficient-flag is at position (0,0) in its group, a corresponding significant-coefficient-group flag is non-zero, the group is not the DC block, and all the previous significant-coefficient flags in that group are zero, then inferring the significant-coefficient-flag at position (0,0) in that group to be 1, andotherwisedecoding the significant-coefficient flag from the bitstream if that significant-coefficient flag is in a group that has corresponding significant-coefficient-group flag that is non-zero, andsetting the significant-coefficient flag to zero, if that significant-coefficient flag is in a group that has corresponding significant-coefficient-group flag that is zero.

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