Dual-Transfer Video Data for HDR-SDR Playback Compatibility
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Solution Overview
Problem
Existing video data generation and reproduction systems lack backward compatibility, as devices supporting high dynamic range (HDR) cannot reproduce standard dynamic range (SDR) content, and vice versa.
Innovation Solution
A data generation method and device that includes video usability information (VUI) and supplemental enhancement information (SEI) to store transfer function information for both SDR and HDR devices, allowing devices to switch between reproduction schemes smoothly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video data is generated using a second OETF for wider luminance dynamic range (HDR), then HDR reproduction quality is improved, but compatibility with first devices supporting only narrow luminance dynamic range (SDR) 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 narrow luminance dynamic range/SDR) and second transfer function information (for wide luminance dynamic range/HDR), 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 SDR-only devices (first devices) and HDR-capable devices (second devices). This multi-functionality allows a single video data package to serve multiple device types
2Adaptability or versatility
If video data includes multiple transfer function information sets for different devices, then reproduction compatibility is improved, but data structure complexity increases
Solution Approach 1:
The patent adds an informational dimension to the video data structure 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 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 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.