Dual Color Shading Processing for Pure Color Preservation
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Solution Overview
Problem
Existing image processing technologies fail to effectively preserve pure colors while correcting color unevenness caused by variations in discharge characteristics of inkjet recording heads, leading to unwanted ink usage and reduced image quality.
Innovation Solution
The implementation of a dual CS processing approach, where CS1 processing corrects color unevenness with high precision without restricting ink types and CS2 processing preserves pure colors by restricting ink usage to specific hues, using separate conversion tables for each, ensuring accurate color reproduction and maintaining image sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color shading correction is performed without restricting ink types, then color unevenness is corrected with high precision, but pure colors are not preserved and unwanted ink is used
Solution Approach 1:
The patent segments the color shading correction process into two distinct processing paths: CS1 processing for high-precision color correction without ink type restrictions, and CS2 processing for pure color preservation with ink type restrictions. This segmentation allows the system to apply different correction strategies to different color regions, correcting color unevenness in non-pure-color regions while preserving pure colors in regions where single-ink usage is maintained.
Solution Approach 2:
The patent applies local quality by determining whether each pixel requires pure color preservation based on its color characteristics. For pixels identified as pure colors (where one ink type dominates), the system applies CS2 processing that restricts ink usage to maintain purity. For other pixels, CS1 processing is applied to achieve high-precision color correction without the constraint of ink type restriction. This localized approach ensures that pure colors are preserved only where necessary while maintaining overall color accuracy.
2Manufacturing precision
If CS processing is applied to correct color unevenness, then discharge characteristic variations are compensated, but image sharpness may drop due to granularities
Solution Approach 1:
The patent segments the correction approach based on color type: for pure color pixels, CS2 processing is applied which uses ink type restriction to minimize the number of ink layers, thereby reducing granularity and preserving sharpness. For non-pure-color pixels, CS1 processing is applied which allows flexible ink combination to achieve accurate color correction. This segmentation ensures that sharpness is maintained in pure color regions while color accuracy is prioritized in other regions.
Solution Approach 2:
The patent changes the correction parameters dynamically based on the pixel type. For pure color pixels, the system uses parameters from CS2 processing that are optimized for minimal ink usage and sharpness preservation. For non-pure-color pixels, the system uses parameters from CS1 processing that are optimized for color accuracy. This parameter change strategy allows the system to adapt the correction approach to the specific requirements of each region, balancing sharpness and color accuracy.
3Device complexity
If a single CS processing method is used for all pixels, then processing is simple, but it cannot simultaneously satisfy both pure color preservation and high-precision color correction demands
Solution Approach 1:
The patent introduces dynamics by making the correction method adaptive rather than static. The system dynamically determines for each pixel whether to apply CS1 or CS2 processing based on the pixel's color characteristics and the user's pure color preservation requirements. This dynamic approach allows the same processing system to adapt to different color types and requirements, providing both pure color preservation and high-precision color correction within a unified framework.
Solution Approach 2:
The patent achieves universality by designing a single image processing apparatus that can perform both CS1 and CS2 processing. The system universally handles both pure color and non-pure-color pixels, and can satisfy both pure color preservation demands and high-precision color correction demands within the same processing pipeline. This multi-functionality allows the system to adapt to diverse user requirements without needing separate processing systems.
Data Source
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AI summary
In conventional color shading (CS) processing for correcting color unevenness with high precision, even an image to preserve pure colors can be corrected to use inks of other colors. Color unevenness is more appropriately corrected to provide a favorable image by properly using pure color preservation information and pure color non-preservation information as color correction information for the CS processing.