PIPELINE FOR HIGH DYNAMIC RANGE VIDEO CODING BASED ON LUMINANCE INDEPENDENT CHROMATICITY PREPROCESSING

Number: 20180131841
Published: 2018-05-10
Filed: 2017-03-14
Assignee: Disney Enterprises, Inc.
Inventors: MAHMALAT; SAMIR et al.
CPC: H04N19/186; H04N1/6058; H04N19/98; H04N1/644; G06T9/00; H04N1/6005; H04N19/85; H04N1/6008
Verdict: Set aside HDR video-coding pipeline, codec plumbing
Source: Google Patents · FreePatentsOnline

Abstract

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.

Background

TECHNICAL FIELD

The present disclosure relates generally to video coding.DESCRIPTION OF THE RELATED ART

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

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 encodin

Claims

1. A method, comprising: converting an additive color space image into a uniform color space image having chrominance components and a luminance component; scaling the chrominance components of the uniform color space image; quantizing the scaled chrominance components and the luminance component; and encoding the quantized chrominance components and the luminance component. 6. 1. 1. 1. 12. A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors, causes a system to: convert an additive color space image into a uniform color space image having chrominance components and a luminance component; scale the chrominance components of the uniform color space image; quantize the scaled chrominance components and the luminance component; and encode the quantized chrominance components and the luminance component. 6. 1. 1. 21. A method, comprising: receiving an input bitstream carrying an encoded image represented by a uniform color space model having chrominance components and a luminance component; decoding quantized chrominance and luminance components of the encoded image; inverse quantizing the quantized chrominance and luminance components; inverse scaling the inverse quantized chrominance components; converting the image represented by a uniform color space model into an image represented by an additive color space model. 1. 6.