Video Reception Transfer-Function Control for SDR-HDR Switching
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Solution Overview
Problem
Existing video reception and transmission systems struggle to accurately display video signals with varying luminance dynamic ranges, such as standard dynamic range (SDR) and high dynamic range (HDR), leading to inappropriate video display and potential errors.
Innovation Solution
A video reception method and apparatus that controls the luminance dynamic range of a display per random access unit using transfer characteristics information, and a video transmission method and apparatus that multiplex this information into the transmission signal, enabling seamless switching between SDR and HDR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed luminance dynamic range is used for video display, then the display system is simple, but it cannot accurately represent video signals with varying luminance ranges (SDR and HDR)
Solution Approach 1:
The patent applies dynamics by making the luminance dynamic range control variable rather than fixed. The display apparatus dynamically switches between SDR and HDR modes based on the transfer characteristics information transmitted with the video signal, allowing the system to adapt to different luminance ranges while maintaining appropriate display performance
Solution Approach 2:
The patent changes the parameter of luminance dynamic range control by introducing transfer characteristics information that specifies the appropriate transfer function (SDR or HDR) for each video signal. This allows the display to adjust its luminance handling parameters according to the specific video content being displayed
2Measurement precision
If transfer characteristics information is not transmitted with the video signal, then the transmission system is simple, but the reception apparatus cannot accurately control the luminance dynamic range
Solution Approach 1:
The patent uses transfer characteristics information as an intermediary element that carries metadata about the required transfer function (SDR or HDR) alongside the video signal. This intermediary data enables the reception apparatus to accurately control the luminance dynamic range without requiring complex embedded control systems within the video signal itself
3Reliability
If the display apparatus does not control luminance dynamic range per random access unit, then the system operation is simple, but errors occur when switching between SDR and HDR video signals
Solution Approach 1:
The patent applies segmentation by dividing the video signal into random access units and controlling the luminance dynamic range independently for each unit based on its transfer characteristics information. This segmentation approach prevents errors during mode switching by ensuring that each random access unit is processed with the correct SDR or HDR parameters, improving overall system reliability
Data Source
AI summary
Provided is a video reception method performed by a video reception apparatus including a display. The video reception method includes: receiving a reception signal multiplexed from a video signal and an audio signal; obtaining the video signal and first transfer characteristics information by demultiplexing the reception signal, the first transfer characteristics information being information for specifying, per random access unit, a transfer function corresponding to a luminance dynamic range of the video signal; obtaining video data by decoding the video signal obtained; and displaying the video data while controlling a luminance dynamic range of the display per random access unit according to the first transfer characteristics information.