×

Entropy encoding and decoding scheme

  • US 9,252,806 B2
  • Filed: 06/09/2015
  • Issued: 02/02/2016
  • Est. Priority Date: 01/14/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method for decoding comprising:

  • receiving, by a VLC decoder, a first portion of a bitstream;

    reconstructing, by the VLC decoder, source symbols of a first subsequence of source symbols from codewords of the first portion of a bitstream;

    receiving, by an arithmetic decoder, a second portion of a bitstream;

    reconstructing, by the arithmetic decoder, source symbols of a second subsequence of source symbols from codewords of the second portion of a bitstream;

    retrieving, by a composer, source symbols from the first subsequence and source symbols from the second subsequence; and

    composing, by the composer, a sequence of syntax elements having a value range which is sub-divided into a sequence of partitions from the first subsequence of source symbols and the second subsequence of source symbols by individually composing each syntax element from a respective number of source symbols by, for at least a subgroup of the syntax elements, determining the respective number of source symbols based on a value of the respective syntax elements and a partition of the sequence of partitions, and by summing-up the values of the respective number of source symbols, as long as the value of at least one source symbol corresponds to a range of a corresponding partition, so as to obtain the value of the syntax element;

    wherein the subgroup of the syntax elements comprises absolute transform coefficient levels of absolute transform coefficients of transform blocks of a picture with the absolute transform coefficient levels of a respective transform block being arranged within the sequence of syntax elements in accordance with a scan path leading through the absolute transform coefficients of the respective transform blocks and;

    wherein the composer is configured to adapt at least one limit between the partitions during composing the absolute transform coefficient levels of the absolute transform coefficients of a respective transform block.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×