Pixel-Level Print Inspection for Colored and Pre-Printed Media
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Solution Overview
Problem
Existing inspection systems fail to effectively inspect print results on colored paper or recording media with pre-printing, as they often exclude colored portions or pre-printed areas from the inspection target, leading to a narrowed inspection area and potential image quality issues.
Innovation Solution
An information processing system that calculates guideline information on the usage amount of image forming material for each pixel, compares color densities of read images with both print images and recording medium images, and determines normality or mismatch based on allowable color density errors, ensuring comprehensive inspection regardless of colored or pre-printed areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If colored portions or pre-printed areas are excluded from the inspection target, then the inspection process becomes simpler and faster, but the inspection target area narrows and image quality assessment accuracy deteriorates
Solution Approach 1:
The patent applies local quality by setting different inspection standards for different regions of the recording medium. For colored or pre-printed areas, the system compares the read image color density with the recording medium read image color density. For non-colored areas, it compares with the print image color density. This region-specific inspection approach maintains comprehensive coverage while adapting to local characteristics, preventing inspection target area narrowing while ensuring accurate quality assessment.
2Device complexity
If a single inspection method is used for all areas, then the inspection process is simpler, but it cannot accurately handle both colored and non-colored regions
Solution Approach 1:
The patent implements a dynamic inspection method that automatically switches between different inspection approaches based on the local characteristics of the recording medium. The system dynamically determines whether to compare with print image data or recording medium data based on whether the current area is colored or pre-printed. This dynamic adaptation ensures high inspection reliability across diverse regions while maintaining manageable system complexity through automated decision-making.
Data Source
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AI summary
An information processing system includes at least one processor configured to: obtain guideline information on a usage amount of an image forming material that constitutes a print image for each of pixels during a printing process in which the image forming material is placed on an upper side of colored paper or a recording medium with pre-printing and is printed; compare, in a case where a value of the guideline information is relatively large when inspecting a read image obtained by reading a printed matter on which the print image is printed on the recording medium, for each of the pixels, a color density of the read image with a color density of the print image; and compare, in a case where the value of the guideline information is relatively small, for each of the pixels, the color density of the read image with a color density of a recording medium read image obtained by reading information about the recording medium before execution of the printing process.