Color Gamut Mapping Device Fine Adjustment YCbCr Signals
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Solution Overview
Problem
Color reproducing devices often have different color spaces and gamuts, leading to a need for color gamut mapping to accurately convert input color signals and improve color reproduction, but existing methods struggle with fine adjustments in saturation, hue, and luminance.
Innovation Solution
A color gamut mapping device that includes a hue angle calculation unit, parameter generation unit, and color signal changing unit, allowing for fine adjustments by changing saturation, hue, and luminance of YCbCr-type color signals to match a predetermined color gamut, using saturation and hue parameters to rotate hue axes and calculate saturation boundary values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color gamut mapping is performed using conventional methods, then color signal conversion is achieved, but fine adjustment capability in saturation, hue, and luminance is insufficient
Solution Approach 1:
The patent implements dynamic adjustment mechanisms for saturation, hue, and luminance parameters. The saturation adjustment unit dynamically modifies saturation values based on input color signals, the hue adjustment unit dynamically rotates hue angles, and the luminance adjustment unit dynamically scales luminance components. This dynamic capability enables fine-tuned color gamut mapping while maintaining high color reproduction accuracy.
Solution Approach 2:
The patent systematically changes multiple color parameters (saturation, hue, luminance) to achieve precise color gamut mapping. By independently adjusting saturation values, hue angles, and luminance components, the system can finely control color output to match target gamuts while preserving color fidelity.
2Measurement precision
If saturation adjustment is performed without fine control, then color gamut mapping is simplified, but color reproduction accuracy deteriorates
Solution Approach 1:
The patent segments the color adjustment process into three independent units: saturation adjustment unit, hue adjustment unit, and luminance adjustment unit. Each unit handles a specific parameter, allowing precise control over saturation while keeping the overall system structure modular and manageable. This segmentation enables fine-tuned saturation adjustment without overwhelming complexity.
Solution Approach 2:
The patent employs parameter-based control where saturation values are adjusted through mathematical transformations of the input color signal components. By changing saturation parameters systematically, the system achieves accurate color reproduction while maintaining a relatively simple computational approach.
3Measurement precision
If hue axes are not matched to primary and secondary colors, then the system is simpler, but color gamut mapping accuracy is reduced
Solution Approach 1:
The patent applies local quality optimization by aligning hue axes specifically with primary colors (red, green, blue) and secondary colors (cyan, magenta, yellow). This targeted alignment ensures accurate hue representation at critical color points while maintaining reasonable system complexity. The hue adjustment unit rotates hue angles to match these specific color positions.
Solution Approach 2:
The patent uses hue angle parameters to control the rotation and alignment of hue axes. By adjusting these parameters, the system can precisely align hue axes with primary and secondary colors, achieving accurate color gamut mapping for standard color spaces.
4Measurement precision
If color signal conversion does not include fine adjustment, then processing speed is faster, but color fidelity is compromised
Solution Approach 1:
The patent implements dynamic adjustment of saturation, hue, and luminance parameters that can be computed efficiently. The adjustment units perform real-time modifications to color signal components using mathematical operations that balance computational complexity with color fidelity requirements, enabling both fast processing and accurate color reproduction.
Solution Approach 2:
The patent uses parameter-based transformations that can be computationally efficient. By representing color adjustments as parameter changes (saturation factors, hue rotation angles, luminance scales), the system can achieve high color fidelity through relatively simple mathematical operations, maintaining processing speed while improving color accuracy.
Data Source
AI summary
There is provided a color gamut mapping device capable of fine adjustment configured to map a color signal to a predetermined color gamut by changing the saturation, hue, and luminance of the corresponding color signal, the color gamut mapping device including a hue angle calculation unit configured to calculate a hue angle using saturation components (Cb, Cr) of a YCbCr-type color signal (Y, Cb, Cr); a parameter generation unit configured to generate at least one of a saturation parameter, a luminance parameter, and a hue parameter using the hue angle; and a color signal changing unit configured to change the YCbCr-type color signal (Y, Cb, Cr) to be mapped to a predetermined color gamut using the parameter, wherein the color signal changing unit includes a saturation changing unit configured to calculate a saturation boundary value determined as a boundary of a predetermined rectangle on a Cb-Cr coordinate plane.