Foreign Matter Detection Using Crossing Polarizing Filters
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Solution Overview
Problem
Existing foreign matter detection systems in mechanical parking facilities and similar areas face challenges in achieving high accuracy while maintaining simplicity and minimizing construction and maintenance costs, as they often rely on complex setups or inadequate image processing methods.
Innovation Solution
A foreign matter detection system utilizing an image capturing device with front- and depth-side polarizing filters, positioned to cross each other's polarizing directions, combined with deep learning algorithms for accurate detection, and a display part for operator confirmation, ensuring precise detection without overdetection or omission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex detection systems are used to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A polarizing filter is introduced as an intermediary component between the image capturing device and the transmission part. The polarizing filter selectively blocks reflected light from the transmission part while allowing light from foreign matters to pass through, thereby improving detection accuracy without requiring complex system architecture. This simple optical filter resolves the contradiction by adding minimal complexity while achieving reliable foreign matter detection.
2Measurement precision
If multiple sensors and complex image processing are used to improve detection accuracy, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The invention uses a simple, inexpensive polarizing filter instead of multiple expensive sensors and complex image processing systems. The polarizing filter is a low-cost optical component that can be easily manufactured and replaced if needed. This approach dramatically reduces manufacturing costs while maintaining high detection accuracy, as the filter passively eliminates reflected light without requiring expensive electronic processing systems.
3Device complexity
If standard image capturing is used without polarizing filters, then device complexity is kept simple, but detection accuracy deteriorates due to reflected light interference
Solution Approach 1:
The invention changes the optical parameter of the light path by introducing a polarizing filter that modifies the polarization state of light. The polarizing filter is oriented to block polarized reflected light from the transmission part while allowing non-polarized or differently polarized light from foreign matters to pass through. This parameter change in light polarization selectively enhances foreign matter detection accuracy while maintaining system simplicity, as the filter requires no active control or complex mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high accuracy in detecting foreign matters with a simple construction, reducing false positives and negatives, and allowing safe operation by preventing detection of objects outside the target area, thus ensuring reliable and efficient foreign matter detection.
Implementation Method 1
front- and depth-side polarizing filters relative to the image capturing device, the polarizing filters being provided on an light path from the transmission part to the image capturing device so as to have polarizing directions crossing each other
Data Source
AI summary
Provided are an image capturing device for capturing an image in a target area, transmission parts through which an outside can be visually observed from inside of the target area and polarizing filters on an light path from the transmission parts to the image capturing device. The front- and depth-side polarizing filters relative to the image capturing device are arranged so as to have polarizing directions crossing each other. A foreign matter in the target area is detected on the basis of the image acquired by the image capturing device.