Printed-Matter Inspection System With Post-Processing Simulation
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Solution Overview
Problem
In printing factories, it is difficult for workers to easily recognize defects in post-processed printed matter, as existing inspection systems display printing defects detected in scanned images without consideration of post-processing, making it challenging to identify and correct issues like incorrect collating or folding in an inline process.
Innovation Solution
A printed-matter inspection system that compares scanned images with reference images to detect defects and simulates the post-processing effects, allowing defects to be displayed on simulated images of the printed matter after processing, enabling accurate identification and correction of defects in the final product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inspection is performed after post-processing, then defects can be detected in the final product, but it becomes difficult to extract and identify specific defective printed sheets
Solution Approach 1:
The system performs preliminary inspection of printed sheets immediately after printing, before post-processing operations. Defective sheets are identified and marked with defect information during this preliminary stage, allowing easy tracking and extraction of defective sheets before they undergo folding, binding, or cutting operations that would make later identification difficult
Solution Approach 2:
The system creates a digital copy or record of defect information for each inspected sheet, storing the defect location and type data. This copied information is then associated with the corresponding sheet throughout the post-processing chain, enabling workers to identify defective sheets by referencing the stored defect data without needing to physically inspect each sheet after processing
2Productivity
If defects are displayed on scanned images without considering post-processing, then inspection results can be obtained quickly, but workers cannot easily recognize defect positions in the final post-processed product
Solution Approach 1:
The system performs defect detection in advance on scanned images of printed sheets, recording the precise location and type of each defect. This preliminary defect information is then stored and later overlaid or associated with simulated images that represent the post-processed product, allowing workers to quickly identify defect positions in the final product without re-inspecting physical sheets
Solution Approach 2:
The system transitions defect information from the two-dimensional scanned image domain to a simulated three-dimensional representation of the post-processed product. By projecting defect locations onto simulated images that mimic the final folded, bound, or cut product format, workers can recognize defect positions in the context of the actual final product layout rather than the original flat sheet
3Loss of time
If inline inspection is implemented, then defects can be detected early in the process, but it requires complex integration with post-processing machines
Solution Approach 1:
The inspection system is segmented into independent functional modules: a scanning module for capturing printed sheet images, a defect detection module for analyzing images and identifying defects, and an information output module for presenting defect data. This segmentation allows the inspection system to operate independently without complex mechanical integration with post-processing machines, reducing overall system complexity while maintaining early defect detection capability
Data Source
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AI summary
A printed-matter inspection system includes a processor that inspects printed matter, and a display device that displays a result of the inspection. The processor is configured to: compare a scanned image with a reference image of an inspection-target page of the printed matter to perform inspection for at least one defect that is present in the scanned image, the scanned image being obtained by scanning the inspection-target page; and obtain information about post-processing that is to be performed on the printed matter, and, on the basis of the information about the post-processing, display, on the display device, the at least one defect in association with at least one simulated image of the printed matter obtained after the post-processing.