Pipeline for high dynamic range video coding based on luminance independent chromaticity preprocessing

The disclosure describes a high dynamic range video coding pipeline that may reduce color artifacts and improve compression efficiency. The disclosed pipeline separates the luminance component from the chrominance components of an input signal (e.g., an RGB source video) and applies a scaling of the chrominance components before encoding, thereby reducing perceivable color artifacts while maintaining luminance quality.

TECHNICAL FIELD(1) The present disclosure relates generally to video coding.DESCRIPTION OF THE RELATED ART(2) Interest in distributing video or other visual content having high dynamic range (HDR) and wide color gamut (WCG) is growing due to its ability to provide a viewing experience that is more enhanced when compared to conventional standard dynamic range (SDR) and standard color gamut (SCG) content. Extended luminance range and color gamut of newer displays create new challenges for the distribution of video and image content. With great quality comes reduced usability of current methods to store, process and distribute video and image content. That is because the bitrates might be too high for current distribution channels.

Current encoding strategies are designed with a stronger focus on retaining luminance quality rather than chrominance quality, which is reasonable for standard dynamic range displays, which typically support content with brightness in the range of about 0.1 to 100 nits. However, with a wider luminance range, color artifacts are more likely to be perceivable.BRIEF SUMMARY OF THE DISCLOSURE(4) Embodiments disclosed herein describe a high dynamic range video coding pipeline that may reduce color artifacts and improve compression efficiency. The disclosed pipeline separates the luminance component from the chrominance components of an input signal (e.g., an RGB source video) and applies a scaling of the chrominance components before encoding, thereby r