CONTENT-ADAPTIVE APPLICATION OF FIXED TRANSFER FUNCTION TO HIGH DYNAMIC RANGE (HDR) AND/OR WIDE COLOR GAMUT (WCG) VIDEO DATA

摘要

This disclosure relates to processing video data, including processing video data to conform to a high dynamic range (HDR)/wide color gamut (WCG) color container. The techniques apply, on an encoding side, pre-processing of color values prior to application of a static transfer function and/or apply post-processing on the output from the application of the static transfer function. By applying pre-processing, the examples may generate color values that when compacted into a different dynamic range by application of the static transfer function linearize the output codewords. By applying post-processing, the examples may increase signal to quantization noise ratio. The examples may apply the inverse of the operations on the encoding side on the decoding side to reconstruct the color values.

主权项

1. A method of video processing, the method comprising:
receiving a first plurality of codewords that represent compacted color values of video data, the compacted color values representing colors in a first dynamic range; uncompacting a second plurality of codewords based on the first plurality of codewords using an inverse static transfer function that is non-adaptive to the video data to generate un-compacted color values, the un-compacted color values representing colors in a second, different dynamic range, wherein the second plurality of codewords are one of codewords from the first plurality of codewords being inverse post-processed or the first plurality of codewords; at least one of inverse post-processing the first plurality of codewords to generate the second plurality of codewords or inverse pre-processing the un-compacted color values; and outputting the un-compacted color values or the inverse pre-processed un-compacted color values.