Color Gamut Mapping Device Gamma Tuning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in color reproducibility due to varying color gamuts, requiring a gamma tuning process to match a target gamma curve for each color, which is not effectively addressed by existing technologies.
Innovation Solution
A color gamut mapping device and method that sets an uppermost saturation control point to tune gamma characteristics by adjusting saturation parameters across different hue axes, ensuring the gamma curve for each color matches a target curve, thereby improving color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a color gamut mapping process is applied to compress or extend color gamut according to display device characteristics, then color reproducibility is improved, but the gamma characteristic for each color may not match the target gamma curve
Solution Approach 1:
The patent divides the color gamut mapping process into two distinct stages: first, color gamut compression/extention to match the target color gamut, and second, gamma tuning for each color channel. This segmentation allows independent optimization of color accuracy and gamma characteristics without interference between the two processes.
Solution Approach 2:
The patent performs gamma tuning as a preliminary action after color gamut mapping is completed. By establishing the gamma characteristics early in the processing chain, the system ensures that subsequent color reproduction operations work with properly calibrated gamma values, leading to more accurate final output.
2Reliability
If gamma tuning is performed separately after color gamut mapping, then gamma characteristics can be adjusted, but the overall processing complexity increases
Solution Approach 1:
The patent merges the gamma tuning operation with the color gamut mapping process by integrating gamma adjustment into the saturation control mechanism. Instead of implementing a completely separate gamma tuning system, the invention utilizes the existing saturation control parameters to simultaneously achieve both color gamut matching and gamma curve alignment, thereby reducing overall system complexity.
3Measurement precision
If saturation parameters are adjusted to tune gamma curves, then gamma accuracy is improved, but color gamut mapping precision may be affected
Solution Approach 1:
The patent applies local quality by adjusting saturation parameters specifically for the uppermost saturation control area, which corresponds to high saturation regions. This localized adjustment allows gamma tuning to be performed selectively in the saturation domain without affecting the overall color gamut mapping accuracy for all saturation levels. The gamma correction is concentrated where it is most needed while preserving color gamut integrity in other regions.
Data Source
AI summary
The disclosure relates to a color gamut mapping device that allows a gamma characteristic for each color to be tuned to match a target gamma curve through color gamut mapping, a tuning method thereof, and an image processor including the same. The color gamut mapping device controls a hue and saturation of an image signal to match a target color gamut using a hue parameter assigned to each of a plurality of hue axes and a saturation parameter assigned to correspond to each of a plurality of saturation control areas of each hue axis, and the color gamut mapping device changes the saturation of the image signal by changing the saturation parameter which is assigned to each hue axis and corresponds to the uppermost saturation control area so that a gamma characteristic for each color of the image signal is changed to match a target gamma curve for each color.