Cloth inspection device and inspection method
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Solution Overview
Problem
Existing cloth inspection apparatuses face challenges in accurately distinguishing between dirt and tears on cloth pieces, leading to inefficient processing and potential re-washing of torn items.
Innovation Solution
An apparatus with a first inspection camera capturing reflected light and a second camera capturing transmitted light, using an inspection table with a dark color section and a light transmitting section, allows for reliable differentiation between dirt and tears by analyzing image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional inspection apparatus uses a single camera to inspect cloth pieces, then the device complexity is low, but the measurement precision for distinguishing dirt and tears is insufficient
Solution Approach 1:
The inspection apparatus is segmented into two independent inspection paths: one for detecting dirt using reflected light, and another for detecting tears using transmitted light. This segmentation allows each camera to specialize in detecting specific defect types, thereby improving measurement precision while maintaining manageable device complexity through modular design.
Solution Approach 2:
The inspection table is designed with local quality differentiation: a dark-colored section for reflected light inspection and a transparent section for transmitted light inspection. This local quality variation optimizes the detection conditions for each type of defect, enabling the cameras to capture images with appropriate contrast and clarity for their specific detection purposes.
2Reliability
If a single inspection method is used, then the device complexity is low, but the reliability of defect classification is insufficient
Solution Approach 1:
The inspection system is divided into two independent detection channels: reflected light channel for dirt detection and transmitted light channel for tear detection. This segmentation ensures that each channel can reliably detect its target defect type without interference, improving overall classification reliability.
Solution Approach 2:
The inspection table uses color changes (dark section vs. transparent section) to differentiate between the two inspection modes. The dark section provides high contrast for reflected light imaging of dirt, while the transparent section allows light transmission for tear detection, enabling reliable defect classification through optical property differentiation.
3Measurement precision
If only reflected light inspection is used, then the device complexity is low, but the measurement precision for detecting dirt on pile fabric is insufficient
Solution Approach 1:
The inspection table incorporates a dark-colored local section that provides high contrast background for reflected light imaging. This local quality enhancement allows the camera to clearly capture dirt particles on pile fabric by creating sufficient contrast between the dirt, the fabric surface, and the dark background, thereby improving measurement precision.
4Measurement precision
If transmitted light inspection is added, then the measurement precision for tear detection is improved, but the loss of time for inspection increases
Solution Approach 1:
The apparatus performs both reflected light and transmitted light inspections simultaneously and continuously as the cloth piece passes through. The dual camera system captures images from both inspection modes at the same time, eliminating sequential processing delays and maintaining continuous inspection flow, thereby improving tear detection precision without significantly increasing inspection time.
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
This approach enables accurate identification of dirt and tears, ensuring that only dirty cloth pieces are re-washed and torn pieces are discarded, improving processing efficiency and detection accuracy.
Implementation Method 1
a first inspection camera (41) for picking up an image of reflected light from a cloth piece (T) passing through the dark color section (21)
Implementation Method 2
a second inspection camera (42) for picking up an image of transmitted light through a cloth piece (T) passing through the light transmitting section (22)
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
Provided is an apparatus and a method for inspecting a cloth piece, by which dirt and a tear can be reliably distinguished, and which have high accuracy to detect the dirt. The apparatus for inspecting a cloth piece includes: an inspection table 20 having a dark color section 21 and a light transmitting section 22; a first inspection camera 41 for picking up an image of reflected light from a cloth piece T passing through the dark color section 21; and a second inspection camera 42 for picking up an image of transmitted light through the cloth piece T passing through the transparent section 22. The dirt and the tear can be reliably distinguished by determining an area where the reflected light and transmitted light are both darker than a surrounding area to be dirt and by determining an area where the reflected light is darker than the surrounding area and the transmitted light is brighter than the surrounding area to be the tear. The dirt inside the cloth piece is emphasized, thereby providing high detection accuracy to detect the dirt.