Color Volume Messaging via SEI for Lower-Overhead HDR Display Management
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Solution Overview
Problem
Existing video coding standards like ITU-T H.265 and SMPTE ST 2094 do not efficiently communicate source color volume information, leading to significant overhead and computational complexity in displaying high-dynamic range and wide color gamut content.
Innovation Solution
A method for communicating source color volume information using Supplemental Enhancement Information (SEI) messaging, including chromaticity coordinates and luminance values for color primaries, minimum, maximum, and average luminance, and optional sliced gamut information, to optimize display management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing video coding standards (ITU-T H.265, SMPTE ST 2094) are used to communicate color volume information, then color volume data can be transmitted, but significant overhead and computational complexity are introduced
Solution Approach 1:
The patent extracts only the essential color volume information (chromaticity coordinates and luminance values for color primaries, plus min/avg/max luminance) from the complex metadata structures proposed in existing standards. By taking out only the critical parameters needed for display management and omitting redundant or overly detailed information, the patent reduces computational complexity while maintaining the necessary color volume information for HDR and WCG content.
2Manufacturing precision
If detailed source color volume information is communicated, then display quality for HDR and WCG content is improved, but message overhead increases significantly
Solution Approach 1:
The patent applies local quality by providing different levels of color volume information for different luminance regions through the optional sliced gamut information. Instead of uniformly transmitting detailed color volume data across the entire luminance range, the patent selectively provides chromaticity coordinates and luminance values for specific slices or regions, optimizing display quality where needed while reducing overhead in other areas.
Solution Approach 2:
The patent implements partial action by making the sliced gamut information optional rather than mandatory. This allows receivers to obtain sufficient color volume information for acceptable display quality without processing the complete detailed information set, thereby reducing message overhead while still enabling improved HDR and WCG content display for capable devices.
3Measurement precision
If comprehensive color volume metadata is transmitted, then display management accuracy is improved, but transmission efficiency decreases
Solution Approach 1:
The patent segments the color volume information into discrete, essential parameters (chromaticity coordinates for color primaries, luminance values for color primaries, minimum luminance, average luminance, maximum luminance) rather than transmitting continuous or overly detailed metadata. This segmentation maintains display management accuracy by providing the key parameters needed for color volume transforms while improving transmission efficiency through reduced data volume.
Data Source
AI summary
Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the minimum, average, and maximum luminance values in the source data. Messaging data signaling an active region in each picture may also be included.