On-line detecting method of machine vision system for printed calico flaw
A technology of machine vision system and printed cloth, which is applied in the direction of material analysis, instruments, and measuring devices through optical means, which can solve the problems of low product pass rate, inability to guarantee the quality of inspection, and high labor intensity, etc., to improve accuracy and qualified rate, reduce the labor intensity of testing, and ensure the effect of accuracy
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Embodiment 1
[0026] Example 1, detection of "displacement" flaws in calico images:
[0027] A. Using white cotton cloth, the image such as figure 1 shown, as the detection example cloth.
[0028] B. Four Xi'an Fangcheng 1300UM industrial cameras are evenly arranged horizontally along the printed cloth and fixed at a height of 1.5m. The camera uses an 8mm COMPUTAR lens, the aperture is adjusted to the maximum value, the exposure time is adjusted to 0.58ms, and the gain value is (It determines the contrast effect of the image) is adjusted to 0; the white light source of 2.65MHZ is used to illuminate directly above, so as to be relatively insensitive to the illumination of the color and pattern of the fabric, but sensitive to the illumination of the flaws; the power supply of the display light source is constant voltage Constant current is a stable light source without frequency variation or high frequency variation, so that clear images of defects can be captured stably and displayed on the...
Embodiment 2
[0040] Example 2: Detection of "missing" flaws in calico patterns:
[0041] The detection example cloth, photographing equipment and operation steps are the same as those in Example 1. Four Xi'an Fangcheng 1300UM cameras were evenly arranged horizontally along the printed cloth and fixed at a height of 1.5m. The cameras used an 8mm COMPUTAR lens, the aperture was adjusted to 2 / 3 position, the exposure time was adjusted to 0.8ms, and the gain value was adjusted to 100. .
[0042] During the real-time shooting process, the dynamic automatic compensation of the light intensity of the standard image template and the correction of the pixel shift of the real-time shooting image are also the same as those in the first embodiment. photographed image 3 "Missing" flawed images of the calico pattern shown beyond precision requirements, image 3 The part within the dotted line is the missing area, and the computer screen displays image 3 The image "missing" defect area value is 20 ...
Embodiment 3
[0044] Example 3: Detection of "smudge" flaws in calico patterns:
[0045] The detection example cloth, photographing equipment and operation steps are the same as those in Example 1. Four Xi'an Fangcheng 1300UM cameras were evenly arranged horizontally along the printed cloth and fixed at a height of 1.5m. The cameras used an 8mm COMPUTAR lens, the aperture was adjusted to 1 / 3 position, the exposure time was adjusted to 1ms, and the gain value was 50.
[0046] During the real-time shooting process, the dynamic automatic compensation of the light intensity of the standard image template and the correction of the pixel shift of the real-time shooting image are also the same as those in the first embodiment. get Figure 4 Images of "smudged" imperfections showing calico patterns that exceed precision requirements, Figure 4 The shaded part is the smudged area, the image gray value is 5, and the difference between the displayed image gray value is 70. The "smudge" defect area i...
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