Selective Trapping for Image Processing Apparatus
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Solution Overview
Problem
Existing image forming apparatuses face challenges in preventing white spots caused by plate misregistration while minimizing visual changes at the boundary of image objects, as conventional trapping processing can lead to unwanted tint changes and color mixing.
Innovation Solution
An image processing apparatus that determines whether to perform trapping processing for each color plate at a target pixel, selectively deciding not to perform trapping on certain color plates based on a determination unit's result to prevent white spots and visual changes, thereby controlling the extension of color regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trapping processing is performed on all color plates to prevent white spots, then white spot prevention is improved, but visual change and color mixing in edge portions worsen
Solution Approach 1:
The patent applies different trapping processing strategies to different color plates based on their specific characteristics. The determination unit evaluates each color plate individually and the trap unit selectively applies trapping only where necessary, rather than uniformly applying it to all color plates. This localizes the trapping effect to prevent white spots only in critical areas while avoiding unnecessary color mixing in other regions.
Solution Approach 2:
The patent changes the parameter of trapping processing application by introducing a determination unit that evaluates specific conditions for each color plate. The trap unit then adjusts its behavior based on this determination, selectively applying trapping processing only when the evaluation criteria are met. This dynamic parameter adjustment allows the system to balance white spot prevention with visual quality preservation.
2Reliability
If trapping processing extends image object regions to overlap, then white spot suppression is improved, but region extension causes unwanted color mixing in edge portions
Solution Approach 1:
The patent applies different trapping processing strategies to different color plates based on their specific characteristics. The determination unit evaluates each color plate individually and the trap unit selectively applies trapping only where necessary, rather than uniformly applying it to all color plates. This localizes the trapping effect to prevent white spots only in critical areas while avoiding unnecessary color mixing in other regions.
Solution Approach 2:
Instead of applying trapping processing universally to all color plates, the patent uses partial action by applying trapping only to specific color plates where the determination unit identifies it as necessary. This selective approach prevents excessive region extension that would cause unwanted color mixing while maintaining sufficient trapping to prevent white spots in critical areas.
Data Source
AI summary
An image processing apparatus includes a determination unit and a trap unit. The determination unit is configured to determine for each of a plurality of color plates whether trapping processing is performed at a position of a target pixel of an image divided to the plurality of color plates. The trap unit is configured to perform the trapping processing at the position of the target pixel for each of the plurality of color plates based on a determination result of the determination unit. In a case where the determination unit determines that the trapping processing is performed on a predetermined color plate, the trap unit does not perform the trapping processing at the position of the target pixel for the color plate on which the trapping processing is performed according to the determination by the determination unit.