Image Processing Apparatus Region-Specific Color Correction
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Solution Overview
Problem
Existing color conversion processing techniques, such as 'perceptual' and 'absolute colorimetric' mapping, often result in chroma reduction or color degeneration, where the distance between colors after mapping becomes smaller than before, leading to incorrect color recognition in printed images.
Innovation Solution
An image processing apparatus that divides image data into regions and applies color conversion processing using region-specific correction units to enhance color differences, ensuring that the color difference between converted colors exceeds a predetermined threshold, thereby reducing color degeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 'perceptual' mapping is performed, then color reproduction within printer gamut is improved, but chroma reduction occurs
Solution Approach 1:
The image data is divided into multiple regions based on color characteristics, and different color conversion processing methods are applied to each region. This segmentation allows the system to maintain chroma in regions where it is important while ensuring accurate color reproduction in other regions, thus resolving the contradiction between chroma preservation and color reproduction accuracy.
Solution Approach 2:
Different color conversion strategies are applied to different regions of the image based on local color characteristics. Regions with high chroma requirements receive processing that preserves saturation, while other regions use mapping optimized for accurate reproduction within printer gamut. This local differentiation resolves the contradiction by allowing each region to have optimized quality characteristics.
2Measurement precision
If 'absolute colorimetric' mapping is performed, then color accuracy is improved, but color degeneration occurs where distance between colors becomes smaller
Solution Approach 1:
The system performs preliminary processing to identify and correct potential color degeneration before final color conversion. By detecting regions prone to color degeneration in advance and applying corrective processing, the system prevents the harmful effect of color distance reduction while maintaining the benefits of absolute colorimetric mapping for color accuracy.
Solution Approach 2:
The system identifies regions where absolute colorimetric mapping would cause color degeneration and applies alternative processing strategies that convert this potential harm into benefit. By using different conversion methods for specific regions, the system transforms what would be a detrimental effect into an opportunity to maintain both color accuracy and color difference.
3Adaptability or versatility
If unique compression is performed in chroma direction, then color space compression is achieved, but appropriate color degeneration is not performed
Solution Approach 1:
The system dynamically adjusts the color conversion strategy based on the specific characteristics of each region and the requirements of the target color space. Rather than applying a fixed compression approach, the system adaptively selects and applies different conversion methods, allowing it to achieve both color space compression and appropriate color degeneration control depending on local requirements.
Data Source
AI summary
An image processing apparatus obtains image data; obtains first color conversion information applicable to the image data; divides the image data into a plurality of region data; corrects the first color conversion information to generate second color conversion information; and applies, to each of the plurality of region data, color conversion processing based on one of the first color conversion information and the second color conversion information. If a color difference between a third color and a fourth color obtained by converting a first color and a second color based on the first color conversion information is smaller than a predetermined color difference, a color difference between a fifth color and a sixth color obtained by converting the first color and the second color based on the second color conversion information is larger than the predetermined color difference.