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

Inactive Publication Date: 2010-03-10
WUXI DONGWANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that the online manual detection of calico defects in the prior art is labor-intensive and prone to visual fatigue, the inspection quality cannot be guaranteed and the product delivery rate is low, the present invention provides an online detection method for calico defects by a machine vision system , which greatly reduces the inspection labor intensity of workers, and the accuracy of defect detection is high, which can effectively guarantee the pass rate of ex-factory products

Method used

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  • On-line detecting method of machine vision system for printed calico flaw
  • On-line detecting method of machine vision system for printed calico flaw
  • On-line detecting method of machine vision system for printed calico flaw

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to an online detecting method of a machine vision system for detecting blemishes of a printed cloth. The invention aims at solving the problem that the labor intensity of manualonline detecting blemishes of the printed cloth is high, and the detecting quality is bad. Clear and thorough, and spotless graphs are shot on the running printed cloth through industrial camera. Theclear and thorough, and spotless graphs are stored in the calculating machine as a standard graph molding board. The blemish area and graphic gray value are taken as the detecting parameter of the blemish. The precision scope of the detecting parameter is arranged according to the requirement of the consumer. The graphs of the running printed cloth are shot in real-time, and are conveyed to the calculating machine. The real-timely shot graphs are compared with the standard graph molding board and are dealt with. If a blemish appears, the operating personnel are indicated to deal with the blemish of the printed cloth through an alarm. The alarm is started through the calculating machine. The invention can carry out light intensity self-compensating of the standard graph molding board, and dynamically correcting the shift of the pixel of the real-timely shot printed cloth graphs. The invention has the advantages of high precision and fast speed of detecting blemishes of the printed cloth, and greatly reduced labor intensity of manual detecting.

Description

technical field [0001] The invention relates to the technical field of on-line detection using a machine vision system, in particular to a method for on-line detection of defects in printed cloth by using a machine vision system at a printed cloth production site. Background technique [0002] In the production workshop site of printing and dyeing printed cloth, the defects of printed cloth need to be checked online. In the prior art, the on-line detection of calico defects relies on manual detection, and 2-4 people are arranged on both sides of the printing machine to visually inspect and process the defects of the calico, and one person is set up at the drying and dropping place to perform the inspection. Product quality tracking and testing. The disadvantages are: high temperature and humidity on site, harsh working environment for workers, and high labor intensity; workers are prone to visual fatigue after working for a long time, and the quality of inspection cannot be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/898D06H3/00
Inventor 董仲伟庞彦清
Owner WUXI DONGWANG TECH
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