HDR Video Chrominance Adjustment for Tone-Mapping Consistency
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Solution Overview
Problem
Existing display devices struggle to accurately display High Dynamic Range (HDR) video signals due to luminance limitations, leading to visual differences in saturation and color temperature before and after tone-mapping processes.
Innovation Solution
A method and apparatus for adjusting saturation and chrominance components of HDR video signals based on luminance values and correction factors, considering the maximum values of multiple color components and using specific formulas to improve accuracy and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tone-mapping processing is performed on HDR video signals for display on devices with limited luminance capability, then the HDR signal can be displayed on current devices, but visual differences in saturation and color temperature occur before and after processing
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting saturation adjustment factors based on luminance values and correction strength parameters. The system modifies saturation parameters selectively across different luminance ranges, using correction strength parameters to control the degree of saturation adjustment, thereby maintaining visual consistency while enabling display compatibility
Solution Approach 2:
The patent implements local quality by applying different saturation adjustment factors to different color components (R, G, B) and different luminance ranges. The system calculates separate correction strength parameters for each color component and applies localized saturation adjustments rather than uniform processing, preserving visual consistency in specific regions while maintaining overall display adaptability
2Manufacturing precision
If saturation adjustment is performed on color signals, then visual consistency is improved, but the complexity of signal processing increases
Solution Approach 1:
The patent applies segmentation by dividing the saturation adjustment process into separate stages: first adjusting saturation for different color components (R, G, B) independently, then applying luminance-based corrections. The system segments the correction strength parameters into multiple levels based on luminance ranges, reducing processing complexity through structured decomposition
Solution Approach 2:
The patent implements preliminary action by pre-calculating correction strength parameters and saturation adjustment factors before the main signal processing. The system prepares lookup tables and pre-computed correction values that can be applied during video processing, reducing real-time computational complexity while maintaining visual consistency
Data Source
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AI summary
A chrominance adjustment method and apparatus, and a storage medium are provided. The method includes: determining a color adjustment coefficient of a chrominance component of a color signal based on a reference display device maximum luminance value (RML) and/or a source maximum luminance value (SML); and adjusting the chrominance component of the color signal based on the color adjustment coefficient.