BIT DEPTH VARIABLE FOR HIGH PRECISION DATA IN WEIGHTED PREDICTION SYNTAX AND SEMANTICS

摘要

Particular embodiments provide a variable, BitDepth, that may be set at a value based on a number of bits used to represent pixels in pictures of a video. The variable may be used in syntax elements in HEVC, such as the HEVC range extension, but other coding standards may be used. By using the variable, different resolutions for the video may be accommodated during the encoding and decoding process. For example, the number of pixels in the pictures may be represented by 8 bits, 10 bits, 12 bits, or another number of bits depending on the resolution. Using the BitDepth variable in the syntax provides flexibility in the motion estimation and motion compensation process. For example, syntax elements used in the weighted prediction process may take into account different numbers of bits used to represent the pictures.

主权项

1. A method comprising:
setting a first value for a variable associated with a bit depth based on a number of bits associated with pixels of pictures in a video; determining a first weighting factor for performing weighted prediction for a current unit of a current picture; using the first weighting factor to weight pixels of a first reference unit of a first reference picture when performing motion compensation for the current unit; and setting a second value for a weighted prediction syntax element associated with the weighting factor, wherein the second value for the weighted prediction syntax element is based on the first value.