Inspection Method for Printed Articles on Special Substrates
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Solution Overview
Problem
Existing defect inspection methods struggle to uniformly inspect printed articles using special substrates, such as transparent media or materials like leather, due to differences in pixel values between non-printing regions and printed regions, leading to false defect notifications.
Innovation Solution
An inspection method that acquires imaging data of printed articles using special substrates, specifies non-printing regions, and applies distinct inspection rules to each region, preventing false notifications by differentiating between substrate regions and printed regions based on positional information and pixel value changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single inspection rule is applied to the entire printed article, then the inspection process is simple, but false defect notifications occur in substrate regions with varying pixel values
Solution Approach 1:
The patent divides the printed article into multiple regions (substrate region, non-printing region, pattern region, background region) and applies different inspection rules to each region. This segmentation allows the system to handle the varying pixel value characteristics of different areas while maintaining overall inspection reliability.
Solution Approach 2:
The patent implements local quality by setting region-specific inspection rules that match the characteristics of each area. For example, substrate regions with varying pixel values use different threshold criteria compared to printed pattern regions, ensuring each region is inspected with appropriate standards.
2Reliability
If imaging is performed on substrate regions, then complete coverage is achieved, but pixel value variations cause false defect notifications
Solution Approach 1:
The patent segments the image data into substrate regions and non-substrate regions, applying different analysis methods to each. This allows complete imaging coverage while suppressing false notifications by excluding substrate region pixel variations from defect detection.
Solution Approach 2:
The patent extracts and excludes substrate region data from the defect detection process. By separating substrate region analysis from printed region analysis, the system eliminates the source of false notifications while maintaining comprehensive imaging coverage.
3Adaptability or versatility
If transparent media or special substrates are used, then design flexibility is improved, but background imaging causes pixel value instability
Solution Approach 1:
The patent segments the image into substrate portions and printed portions, allowing transparent media and special substrates to be used for design flexibility while excluding substrate pixel variations from defect measurement, thus maintaining measurement precision.
Data Source
AI summary
Provided are an inspection method, a program, an inspection device, and a printing device capable of realizing a uniform inspection in a defect inspection of a printed article using a special substrate. A method includes an imaging data acquisition step (S14) of acquiring imaging data (48) of a printed article using a special substrate, a non-printing region positional information acquisition step (S16) of acquiring information (44) for specifying a position of a non-printing region in the imaging data, the non-printing region corresponding to a substrate region of the printed article on which a pattern and a background of the pattern are not printed, an inspection step (S20) of specifying the non-printing region, analyzing the imaging data by applying a predetermined inspection rule (46), and performing an inspection of the printed article, and a notification step (S22) of performing a notification of an inspection result (50) and not performing a notification of an inspection result indicating that a defect is present in the substrate region of the printed article corresponding to the non-printing region.