Static Strip Image Validation for Print Inspection Algorithms
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Solution Overview
Problem
Conventional print inspection systems require time-consuming and costly validation processes using moving test rolls with artificially introduced defects, which are error-tolerant and prone to additional costs due to abrasion.
Innovation Solution
An apparatus with a matrix camera that captures and compares static strip images from a stencil with a test pattern, allowing for validation of inspection algorithms without moving the test image, using a control device to set the evaluation device into validation mode based on sensor measurements or predefined schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moving test roll with artificially introduced defects is used for validation, then the inspection algorithms can be validated, but the process becomes time-consuming and costly due to regular replacement needed
Solution Approach 1:
Instead of moving the test image through the inspection system, the patent inverts the approach by keeping the test image static and moving the camera system to capture multiple strip images from different positions. This eliminates the need for continuous movement of the test roll while still enabling comprehensive validation of the inspection algorithms across the entire test pattern.
Solution Approach 2:
The patent creates multiple copies of the test image captured at different positions using the multi-line camera. These strip images are then processed and compared to validate the inspection algorithms. This copying approach replaces the need for a single physical moving test roll with multiple static captures, reducing wear and replacement frequency.
2Reliability
If a moving test roll is used for validation, then defect detection can be tested, but additional costs arise due to abrasion and regular replacement
Solution Approach 1:
The patent inverts the traditional validation approach by keeping the test image stationary and moving the camera instead. This eliminates mechanical contact and abrasion between the test roll and the inspection system, thereby preserving the test image integrity and eliminating replacement costs associated with wear and tear.
Solution Approach 2:
The patent replaces the mechanical moving test roll system with an optical/electronic system using a multi-line camera to capture multiple strip images. This substitution eliminates mechanical abrasion and the need for physical test roll replacement, reducing material loss and associated costs.
3Measurement precision
If conventional validation methods are used, then inspection settings can be validated, but the process requires continuous movement of the test image
Solution Approach 1:
The patent inverts the validation process by capturing multiple static strip images simultaneously using a multi-line camera's multi-line image area, rather than moving the test image continuously. This simplifies the validation process by eliminating mechanical movement while maintaining the ability to validate inspection settings across multiple positions.
Solution Approach 2:
The patent merges multiple strip image captures into a single validation process using the multi-line camera's ability to capture multiple lines simultaneously. This combines what would traditionally require sequential movement and multiple separate validations into a single integrated process, reducing complexity.
Data Source
AI summary
In an embodiment an apparatus includes an image acquisition device with at least one camera, the image acquisition device configured to acquire a multi-line section of a recording region and an evaluation device configured to process at least two sub-areas of the multi-line section as one strip image each and compare at least two strip images of a test pattern to each other in a validation mode to check whether deviations of the strip images are detected.