Video Reception Apparatus Luminance Dynamic Range Control
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Solution Overview
Problem
Existing video reception systems struggle to accurately control the luminance dynamic range of displays when switching between High Dynamic Range (HDR) and Standard Dynamic Range (SDR) video content, leading to potential display of excessively bright video during errors or transitions.
Innovation Solution
A video reception method and apparatus that receive a signal containing video data and transfer characteristics information, allowing for precise control of the display's luminance dynamic range at frame accuracy. This involves demultiplexing and decoding the signal to obtain the transfer characteristics, which specify the appropriate transfer function for the luminance range, enabling seamless switching between HDR and SDR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the video reception apparatus switches between HDR and SDR luminance dynamic ranges during video playback, then the display can adapt to different video content types, but errors or delays in detecting transfer characteristics information may cause excessively bright video to be displayed
Solution Approach 1:
The system sets a preliminary luminance dynamic range (SDR) before receiving transfer characteristics information, and maintains this preliminary setting until the actual transfer characteristics are confirmed. This preliminary action prevents excessively bright display by ensuring a safe default state is established in advance, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The system continuously monitors for transfer characteristics information in the video signal and adjusts the luminance dynamic range based on this feedback. When transfer characteristics information is detected, the system switches from the preliminary SDR setting to the appropriate HDR or SDR setting. This feedback mechanism ensures reliable display control while maintaining adaptability to different video content types.
2Measurement precision
If the video reception apparatus waits to detect transfer characteristics information before controlling luminance dynamic range, then accurate display control can be achieved, but video display delay occurs during the detection period
Solution Approach 1:
The system performs preliminary detection of transfer characteristics information at the start of video playback and sets a preliminary luminance dynamic range (SDR) during this initial period. This allows the system to begin video display immediately with a safe default setting, eliminating display delay while maintaining the ability to switch to accurate HDR settings once transfer characteristics are confirmed.
Solution Approach 2:
The system prepares a preliminary luminance dynamic range setting (SDR) in advance that serves as a cushion or safety net during the detection period. This preliminary setting ensures that even if transfer characteristics information is delayed or missing, the video will still be displayed appropriately without excessive brightness or noticeable delay, resolving the contradiction between measurement precision and time loss.
3Productivity
If the video reception apparatus assumes a default luminance dynamic range when transfer characteristics information is not received, then video can be displayed without delay, but the display may not be optimal for the actual video content
Solution Approach 1:
The system sets a preliminary luminance dynamic range (SDR) that can be displayed immediately when video playback starts, ensuring continuous video display without delay. This preliminary setting provides a safe default that maintains productivity while the system continues to search for transfer characteristics information to improve display quality accuracy.
Solution Approach 2:
The system dynamically adjusts the luminance dynamic range from the preliminary SDR setting to the appropriate HDR or SDR setting once transfer characteristics information is detected. This dynamic switching capability allows the system to maintain video display continuity with a safe default while transitioning to optimal display quality when information becomes available, resolving the contradiction between productivity and manufacturing precision.
Data Source
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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 video data and audio data; outputting, as first transfer characteristics information, transfer characteristics obtained by demultiplexing the reception signal; outputting, as second transfer characteristics information, transfer characteristics obtained by decoding the video data, the second transfer characteristics information being information for specifying, at frame accuracy, a transfer function corresponding to a luminance dynamic range of the video data; and displaying the video data while controlling a luminance dynamic range of the display at frame accuracy according to the second transfer characteristics information.