Method and Apparatus for Entropy Coding of Source Samples with Large Alphabet

  • US 20180302626A1
  • Filed: 06/26/2018
  • Published: 10/18/2018
  • 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 having a current symbol value belonging to a set of symbol values;

    when the source symbols correspond to horizontal components or vertical components of motion vector differences (MVDs) for Inter prediction coding, determining a threshold for the set of symbol values, wherein separate thresholds are selected for the source symbols corresponding to different motion vector resolutions related to the MVDs;

    if an absolute current symbol value is greater than the threshold associated with a corresponding motion vector resolution for the current source symbol, deriving a first binary string by binarizing a remaining absolute level of the absolute current symbol value using a variable length code;

    if the absolute current symbol value is not greater than the threshold associated with the corresponding motion vector resolution for the current source symbol, deriving a second binary string by binarizing the remaining absolute level of the absolute current symbol value using a fixed-length code; and

    encoding the first binary string or the second binary string depending on whether the absolute current symbol value is greater than the threshold.

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