HDR Video Transfer Function Signaling for SDR Compatibility
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Solution Overview
Problem
Existing video data generation and reproduction technologies struggle with backward compatibility, as high dynamic range (HDR) video data is not reproducible by standard dynamic range (SDR) devices, limiting the widespread adoption of HDR technology.
Innovation Solution
A data generation method and device that generate video data using a second opto-electrical transfer function (OETF) for HDR devices and store first and second transfer function information in video usability information (VUI) and supplemental enhancement information (SEI) to enable reproduction by both HDR and SDR devices, along with hybrid information for smooth switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video data is generated using a second OETF for HDR devices, then the luminance dynamic range coverage is improved, but compatibility with SDR devices is worsened
Solution Approach 1:
The transfer function information is segmented into two separate storage locations: VUI contains first transfer function information for SDR devices, while SEI contains second transfer function information for HDR devices. This segmentation allows each device type to access the appropriate transfer function without interference, resolving the compatibility conflict between HDR and SDR reproduction
Solution Approach 2:
The SEI message acts as an intermediary layer that provides additional HDR-specific transfer function information without disrupting the standard VUI structure. HDR-capable devices can access this intermediary information while SDR devices ignore it, enabling backward compatibility while supporting advanced features
2Reliability
If only first transfer function information is stored in VUI for SDR device compatibility, then backward compatibility is maintained, but HDR reproduction capability is lost
Solution Approach 1:
The system performs preliminary action by embedding both first transfer function information (in VUI) and second transfer function information (in SEI) during video data generation. This advance preparation ensures that both SDR and HDR devices can find their required transfer function information without requiring real-time conversion or additional processing
Solution Approach 2:
The video data structure is designed with universal compatibility by incorporating multiple transfer function specifications. The VUI provides universal baseline compatibility for all devices, while the SEI extends functionality for advanced HDR-capable devices, making the same video data universally usable across different device capabilities
3Adaptability or versatility
If dual transfer function information is stored in both VUI and SEI, then both HDR and SDR device compatibility is achieved, but data structure complexity increases
Solution Approach 1:
The system implements dynamic information retrieval where devices adaptively select which transfer function information to use based on their capabilities. SDR devices dynamically access only VUI information, while HDR devices dynamically access both VUI and SEI information, optimizing processing efficiency despite the dual-information structure
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.