Method and system for reducing slice header parsing overhead in video coding

摘要

A method for encoding a picture of a video sequence in a bit stream that reduces slice header parsing overhead is provided. The method includes determining weighting factors that may be used for weighted prediction in encoding at least one slice of the picture, wherein a total number of the weighting factors is constrained to not exceed a predetermined threshold number of weighting factors, wherein the threshold number is less than a maximum possible number of weighting factors, and signaling weighted prediction parameters including the weighting factors in a slice header in the bit stream.

主权项

1. A method for encoding a picture of a video sequence in a bit stream, the method comprising:
determining weighting factors that may be used for weighted prediction in encoding at least one slice of the picture, wherein a total number of the weighting factors is constrained to not exceed a predetermined threshold number of weighting factors, wherein the threshold number is less than a maximum possible number of weighting factors, wherein determining weighting factors further comprises:
determining a number of weighting factors computed for the first plurality of reference pictures by computing a sum of a number of enabled luminance weight flags and two times a number of enabled chrominance weight flags;determining, for each reference picture of a first plurality of reference pictures, whether or not weighted prediction is to be enabled for a luminance component of the reference picture and enabling or disabling a luminance weight flag corresponding to the reference picture accordingly;computing luminance weighting factors for each reference picture for which weighted prediction is enabled for the luminance component;determining, for each reference picture of the first plurality of reference pictures, whether or not weighted prediction is to be enabled for chrominance components of the reference picture and enabling or disabling a chrominance weight flag corresponding to the reference picture accordingly; andcomputing chrominance weighting factors for each reference picture for which weighted prediction is enabled for the chrominance components; and signaling weighted prediction parameters comprising the weighting factors in a slice header in the bit stream.