Dual Transfer-Function Video Signaling for HDR-SDR Playback
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Solution Overview
Problem
Existing video data generation and reproduction technologies face challenges in achieving backward compatibility, particularly in supporting both high dynamic range (HDR) and standard dynamic range (SDR) video data without compromising reproduction quality.
Innovation Solution
The proposed solution involves a data generation method that uses a second opto-electrical transfer function (OETF) for HDR video data, while storing first transfer function information for SDR compatibility within video usability information (VUI) and second transfer function information for HDR compatibility within supplemental enhancement information (SEI). This allows devices supporting both HDR and SDR to reproduce video data seamlessly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video data is generated using a second OETF for wider luminance dynamic range (HDR), then the luminance dynamic range coverage is improved, but compatibility with first devices supporting only standard dynamic range deteriorates
Solution Approach 1:
The video data is segmented to include multiple transfer function information sets corresponding to different luminance dynamic ranges. The system divides the transfer function information into first transfer function information (for standard dynamic range) and second transfer function information (for high dynamic range), allowing devices to select the appropriate segment based on their capabilities
Solution Approach 2:
The video data structure is designed to be universal by incorporating both first and second transfer function information, enabling the same video data to be properly reproduced on both standard dynamic range devices (first devices) and high dynamic range devices (second devices). This multi-functionality allows a single video data package to serve multiple device types
2Adaptability or versatility
If a single transfer function is used in video data, then device complexity is reduced, but adaptability to different luminance dynamic ranges deteriorates
Solution Approach 1:
The solution adds an informational dimension to the video data by incorporating metadata layers (such as SEI messages or VUI parameters) that carry transfer function information. This additional dimension allows the system to convey multiple transfer function characteristics without fundamentally altering the core video signal structure
Solution Approach 2:
Transfer function information acts as an intermediary between the encoded video signal and the reproduction device. This intermediary layer provides the necessary instructions for devices to correctly interpret and reproduce the video data according to their luminance dynamic range capabilities, without requiring direct modification of the video signal itself
Data Source
AI summary
A data generation method is for generating video data that covers a second luminance dynamic range wider than a first luminance dynamic range and has reproduction compatibility with a first device that does not support reproduction of video having the second luminance dynamic range and supports reproduction of video having the first luminance dynamic range, and includes: generating a video signal to be included in the video data using a second OETF; storing, into VUI in the video data, first transfer function information for identifying a first OETF to be referred 10 to by the first device when the first device decodes the video data; and storing, into SEI in the video data, second transfer function information for identifying a second OETF to be referred to by a second device supporting reproduction of video having the second luminance dynamic range when the second device decodes the video data.