ADAPTIVE CONSTANT-LUMINANCE APPROACH FOR HIGH DYNAMIC RANGE AND WIDE COLOR GAMUT VIDEO CODING

摘要

A device may determine, based on data in a bitstream, a luma sample (Y) of a pixel, a Cb sample of the pixel, and the Cr sample of the pixel. Furthermore, the device may obtain, from the bitstream, a first scaling factor and a second scaling factor. Additionally, the device may determine, based on the first scaling factor, the Cb sample for the pixel, and Y, a converted B sample (B′) for the pixel. The device may determine, based on the second scaling factor, the Cr sample for the pixel, and Y, a converted R sample (R′) for the pixel. The device may apply an electro-optical transfer function (EOTF) to convert Y′, R′, and B′ to a luminance sample for the pixel, a R sample for the pixel, and a B sample for the pixel, respectively.

主权项

1. A method of encoding video data, the method comprising:
determining, based on a R sample of a pixel of the video data, a G sample of the pixel, and a B sample of the pixel, a luminance sample (Y) for the pixel, wherein the R sample, the G sample, the B sample, and the luminance sample are in linear light; applying an optical-electro transfer function (OETF) to convert Y, the R sample, and the B sample to a luma sample (Y′), a converted R sample (R′), and a converted B sample (B′), respectively; determining, based on a first scaling factor, B′, and Y′, a Cb sample for the pixel; determining, based on a second scaling factor, R′, and Y′, a Cr sample for the pixel; encoding a block of video data comprising Y′, the Cb sample, and the Cr sample; and signaling, in a bitstream comprising a coded representation of the video data, the first scaling factor and the second scaling factor.