Luminance Compensation for Multi-Primary Color Displays
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Solution Overview
Problem
Multi-color image displays face challenges in maintaining consistent luminance across colors with varying saturation levels, leading to picture quality deterioration due to conventional luminance enhancement methods that either brighten all colors or fail to address luminance differences between high and low saturation colors.
Innovation Solution
A method and apparatus for compensating color signal luminance by calculating an allowable luminance ratio and adjusting it based on saturation levels, specifically for displays using four or more primary colors, to enhance luminance proportionally with saturation, thereby reducing luminance differences between high and low saturation colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional luminance enhancement methods are applied to multi-color image displays, then the luminance of color signals can be increased, but the luminance difference between high saturation and low saturation colors worsens, leading to picture quality deterioration
Solution Approach 1:
The patent applies different luminance enhancement strategies to different color regions based on their saturation characteristics. High saturation colors (in areas Org-Q3-Q1 and Org-Q6-Q5) receive different processing compared to low saturation colors (in area Org-Q1-Q4-Q5), allowing each region to be optimized locally rather than applying a uniform enhancement that would worsen luminance inconsistencies
Solution Approach 2:
The patent changes the luminance parameter dynamically based on saturation levels. By detecting the saturation of color signals and adjusting luminance compensation accordingly, the system adapts the luminance enhancement parameter to maintain consistency across different saturation levels while still improving overall luminance
2Adaptability or versatility
If the number of primary colors is increased to four or more, then the color gamut is expanded, but the luminance of primary color signals decreases relative to synthetic colors
Solution Approach 1:
The patent compensates for the luminance decrease of primary color signals by dynamically adjusting luminance parameters based on saturation detection. When a color signal is identified as having high saturation (indicating it is a primary color or near-primary), the system applies luminance compensation to restore the luminance level that would otherwise be lost due to the increased number of primary colors
3Illumination intensity
If offset values are applied to RGB to increase luminance, then the overall luminance is improved, but the contrast of the image deteriorates
Solution Approach 1:
Instead of applying a uniform offset to all RGB values, the patent applies luminance enhancement locally based on the saturation characteristics of each color signal. This selective approach ensures that luminance is improved where needed (in high saturation areas) without uniformly brightening all colors, thereby preserving image contrast
Solution Approach 2:
The patent applies luminance enhancement partially rather than uniformly across all color signals. By targeting only the necessary regions (high saturation colors that suffer from luminance loss) and applying appropriate compensation levels, the system improves overall luminance perception without the excessive brightening that would degrade contrast
Data Source
AI summary
A method and apparatus for compensating for the luminance of a color signal. The luminance compensation method includes obtaining an allowable luminance ratio of a color signal, obtaining a luminance enhancing ratio of a color signal using the allowable luminance ratio, and compensating for the luminance of the color signal using the luminance enhancing ratio. The luminance ratio is the ratio of a luminance according to saturation when a color signal is represented by four or more multiple primary colors, to a luminance according to saturation when the color signal is represented by three colors.