Method and apparatus for entropy coding of source samples with large alphabet

  • US 10,819,981 B2
  • Filed: 06/26/2018
  • Issued: 10/27/2020
  • Est. Priority Date: 01/30/2015
  • Status: Active Grant
First Claim
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1. A method of entropy coding for source symbols in an encoder comprising:

  • receiving a current source symbol belonging to a set of source symbols, wherein each source symbol consists of a horizontal component and a vertical component, and the horizontal component and the vertical component are associated with one motion vector difference (MVD) for Inter prediction coding, or one block vector difference (BVD) for Intra block copy (IBC), Intra line copy, or one vector offset for Intra string copy (ISC) coding, or one position vector for the last significant coefficient in a transform unit (TU);

    determining a first flag indicating whether a first absolute value of a first component is greater than zero, wherein the first component corresponds to the horizontal component or the vertical component;

    determining a second flag indicating whether a second absolute value of a second component is greater than zero, wherein the second component corresponds to the horizontal component or the vertical component and is a different component from the first component; and

    encoding the second flag using context model derived based on the first flag after the first flag is coded, or encoding a pair of the first flag and the second flag jointly,wherein when the horizontal component and the vertical component are associated with one offset vector Intra string copy (ISC) coding, and the pair of the first flag and the second flag is encoded jointly, a combination for both the first flag and the second flag being zero is excluded from encoding process and the pair of the first flag and the second flag is binarized into a bin string using a truncated unary code with a maximum value equal to 2.

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