Pseudo Defect Image Generation for Printing Error Inspection
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Solution Overview
Problem
Current image inspection techniques for printed matter lack accuracy in determining the acceptability of printing errors, as they rely on fixed thresholds and do not effectively handle defects occurring in different areas of an image, leading to potential misclassification and quality issues.
Innovation Solution
An image inspecting apparatus that compares scanned image data with sample image data to detect printing errors and generates pseudo defect images at different locations, allowing users to determine acceptability and adjust detection thresholds accordingly, enhancing accuracy and user control over image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed threshold comparison is used to detect printing errors, then the inspection process is simple and fast, but the accuracy of acceptability determination deteriorates
Solution Approach 1:
The patent transforms the fixed threshold inspection method into a dynamic one by generating pseudo defect images at multiple positions and allowing users to interactively adjust detection thresholds. The system dynamically adapts the inspection criteria based on user feedback and the specific characteristics of detected defects, thereby improving accuracy without significantly reducing inspection speed.
Solution Approach 2:
The patent implements a feedback mechanism where users review pseudo defect images and provide feedback on defect acceptability. This feedback is used to adjust the detection thresholds and inspection criteria, creating a closed-loop system that continuously improves the accuracy of acceptability determination while maintaining efficient inspection throughput.
2Device complexity
If printing errors are detected using fixed thresholds, then the inspection process is straightforward, but the ability to handle defects in different image areas deteriorates
Solution Approach 1:
The patent applies local quality by generating pseudo defect images at multiple specific positions within the scanned image and allowing users to evaluate defects in different areas separately. The system can adjust detection criteria locally for different regions of the image, enabling tailored inspection standards for various areas while maintaining an otherwise straightforward inspection process.
Solution Approach 2:
The patent segments the inspection process into multiple stages: initial automatic detection using fixed thresholds, generation of pseudo defect images at different positions, user review and evaluation, and threshold adjustment. This segmentation allows the system to maintain simplicity in the automated portion while adding complexity only where needed for handling different defect areas.
3Measurement precision
If pseudo defect images are generated at different positions, then the accuracy of acceptability determination improves, but the device complexity increases
Solution Approach 1:
The patent uses copying by creating pseudo defect images that replicate the appearance of actual printing errors at different positions. These copied defect images allow users to evaluate the acceptability of defects without processing the entire original scanned image repeatedly, reducing the computational complexity while maintaining high accuracy in acceptability determination.
Solution Approach 2:
The patent applies preliminary action by pre-generating pseudo defect images at multiple positions before the final acceptability determination. This preliminary generation of test images allows the system to prepare multiple evaluation scenarios in advance, reducing the complexity of real-time processing while improving the accuracy of the final determination through comprehensive evaluation.
Data Source
AI summary
An image inspecting apparatus includes circuitry. The circuitry is configured to determine, based on a result of comparison of scanned image data and sample image data, whether an image indicated by the scanned image data has a printing error, the scanned image data being generated from a document image formed and output according to document image data on a recording medium and read, the sample image data corresponding to the document image data. The circuitry is configured to generate display image data representing a pseudo defect image having the printing error added to a position different from a position of the printing error in the image indicated by the scanned image data, in response to determination that the image indicated by the scanned image data has the printing error.