Image Gamut Mapping With Selective Color Degeneration Correction
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Solution Overview
Problem
Existing image processing systems fail to prevent colors from becoming different across regions during mapping, leading to color degeneration and misinterpretation in printed documents.
Innovation Solution
An image processing apparatus that dynamically performs gamut mapping and color degeneration correction, identifying color variation reduction targets based on in-page likelihood and controlling correction to maintain consistent tint across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color degeneration correction is performed for all colors during gamut mapping, then color accuracy is improved, but color consistency across different regions deteriorates
Solution Approach 1:
The patent applies different correction strategies to different colors based on their characteristics. By calculating in-page likelihood for each color and selectively applying correction only to colors with low in-page likelihood (those more prone to degeneration), the system achieves color accuracy improvement without compromising consistency across regions where colors should remain uniform.
Solution Approach 2:
The system dynamically adjusts the correction amount based on the in-page likelihood parameter. By varying the degree of correction applied to different colors according to their likelihood of degeneration, the system optimizes both color accuracy and consistency, preventing over-correction in regions where consistency is critical.
2Measurement precision
If correction amount is increased to reduce color degeneration, then color accuracy is improved, but color variation across regions increases
Solution Approach 1:
The system calculates in-page likelihood as a feedback parameter that indicates how much a particular color is likely to undergo degeneration during gamut mapping. This feedback information is used to control the correction amount dynamically, applying stronger correction to colors with lower in-page likelihood while reducing or eliminating correction for colors with higher in-page likelihood, thus preventing color variation across regions.
Data Source
AI summary
An image processing apparatus includes: a second obtaining unit that obtains information indicating a characteristic of color information of a first color gamut obtained in an image represented by image data; a third obtaining unit that obtains information indicating a characteristic of the color information of the first color gamut specified in second image data; and a setting unit that sets, on a basis of the information indicating a characteristic of the color information of the first color gamut obtained by the second obtaining unit and the information indicating a characteristic of the color information of the first color gamut obtained by the third obtaining unit, color information corresponding to a target for suppressing correction by a correction unit from among the color information of the first color gamut.