Contour Inspection Accuracy Using Read Image Data
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Solution Overview
Problem
Existing image inspection methods using original image data as correct image data may inaccurately determine the quality of contour portions in read image data due to printer characteristics, leading to potential false failures.
Innovation Solution
An inspection device and image forming apparatus that perform a second inspection using read image data as correct image data, improving accuracy by ensuring identical states of image collation, particularly for contour portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If original image data is used as correct image data for inspection, then the inspection process is simple and fast, but the inspection accuracy of contour portions deteriorates due to printer characteristics causing thicker lines in read image data
Solution Approach 1:
The inspection process is segmented into two distinct inspection processes: a first inspection process that inspects the entire read image data using original image data as correct image data, and a second inspection process that specifically inspects contour portions using read image data as correct image data. This segmentation allows each process to be optimized for its specific purpose, resolving the contradiction between overall inspection simplicity and contour portion accuracy.
Solution Approach 2:
Different inspection methods are applied to different regions of the image. The first inspection process is used for general image inspection where speed is important, while the second inspection process with read image data as correct image data is applied specifically to contour portions where high accuracy is critical. This local differentiation resolves the contradiction by applying the most appropriate method to each region.
2Measurement precision
If read image data is used as correct image data for contour portion inspection, then the inspection accuracy of contour portions improves by ensuring identical states of image collation, but the inspection process becomes more complex
Solution Approach 1:
The inspection process is divided into two sequential processes. The first inspection process quickly screens the entire image using original image data, and only the contour portions that pass this initial screening are subjected to the second inspection process using read image data as correct image data. This segmentation reduces the overall time loss by applying the more time-consuming second process only to necessary regions.
Solution Approach 2:
The second inspection process using read image data as correct image data is applied partially only to contour portions rather than the entire image. This partial application reduces the total processing time while maintaining high accuracy for the critical contour regions, resolving the contradiction between accuracy improvement and time loss.
Data Source
AI summary
An inspection device includes a processor configured to use original image data as correct image data, and in a case where a first inspection of determining quality of read image data as an inspection target is performed using the correct image data, the read image data being obtained by reading an image-formed matter obtained by forming the original image data on a recording medium, perform a second inspection on a contour portion included in the read image data as the inspection target, the second inspection using read image data obtained based on the original image data, as the correct image data.