Dynamic Luminance Metadata Conversion for HDR Video Tone Mapping
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Solution Overview
Problem
Current video processing systems face challenges in performing dynamic tone mapping when graphics are overlaid on moving images, leading to unstable video display quality due to variations in luminance and color, especially when the video display apparatus does not support the HDR format of the main video, resulting in poor dynamic tone mapping and quality issues.
Innovation Solution
A video processing system that acquires video data and display format, generates dynamic luminance characteristics information, and outputs it to perform tone mapping, allowing the system to dynamically adjust luminance based on the display capabilities of the video display apparatus, even when the HDR format of the main video differs from the display format, by converting metadata to match the display format and performing tone mapping accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dynamic tone mapping is performed when the video display apparatus does not support the HDR format of the main video, then video display quality is improved, but the system complexity increases due to format conversion requirements
Solution Approach 1:
The system changes the luminance dynamic range format parameter from the original HDR format to a format supported by the display apparatus. The generator converts the first dynamic luminance characteristics (in original HDR format) to second dynamic luminance characteristics (in display format), enabling compatible display while maintaining quality.
Solution Approach 2:
The generator acts as an intermediary component that mediates between the main video data and the display apparatus. It converts metadata from one format to another, enabling the system to handle format mismatches without requiring the display apparatus to support multiple formats.
2Adaptability or versatility
If format conversion is performed to match display capabilities, then compatibility is improved, but processing time increases
Solution Approach 1:
The system performs format conversion in advance before video playback. The generator converts the first dynamic luminance characteristics to the second dynamic luminance characteristics corresponding to the display format, so that the converted metadata is ready for immediate use during playback without real-time processing delays.
3Manufacturing precision
If dynamic luminance characteristics are converted to match display format, then video quality is improved, but the complexity of metadata processing increases
Solution Approach 1:
The system applies format conversion specifically to the dynamic luminance characteristics metadata while leaving other video data unchanged. The generator focuses only on converting the relevant luminance parameters from the first format to the second format, rather than converting the entire video stream.
Data Source
AI summary
A video processing system includes: an acquirer that acquires video data including a main video; a format acquirer that acquires a display format that indicates a luminance dynamic range format displayable by a video display apparatus; a generator that generates first characteristics information that indicates first dynamic luminance characteristics that correspond to the display format by using the video data when a luminance dynamic range format of the main video indicated by the video data is different from the display format, the first dynamic luminance characteristics being dynamic luminance characteristics indicating a time-dependent change in luminance characteristics of the main video; and a video transmitter that outputs the first characteristics information generated by the generator.