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Printing dye aberration on-line detection method of machine vision system

A technology of machine vision system and detection method, which is applied in the direction of color measurement using color charts, color measurement devices, instruments, etc., can solve the problems of unguaranteed detection quality, low detection accuracy, and high labor intensity, so as to reduce the detection labor intensity , Improve the detection speed, improve the effect of accuracy

Inactive Publication Date: 2008-03-26
WUXI ZHONGWANG 4D 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 detection of printing and dyeing color difference in the prior art relies on manual detection, the detection accuracy is low, the continuous online detection is impossible, the labor intensity is high, the detection quality cannot be guaranteed and the pass rate of products is low, the invention provides a machine vision The system's online detection method for printing and dyeing color difference greatly reduces the labor intensity of workers' detection, and the detection accuracy of dyeing color difference is high, which can effectively ensure the pass rate of ex-factory products

Method used

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  • Printing dye aberration on-line detection method of machine vision system

Examples

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Effect test

Embodiment 1

[0019] Example 1, the detection of left, middle and right dyeing color difference (also known as left, middle and right difference or edge center difference) of printed and dyed cloth:

[0020] A. Detection cloth: The red pure cotton printing and dyeing cloth produced for a certain customer is adopted as the embodiment detection cloth.

[0021] B. Image shooting camera: fix the Beijing New Era MVC2000DA-GE16CCD industrial color camera at 50cm directly above the printing and dyeing cloth, 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 (which determines the image) The contrast effect) is adjusted to 0; the Boshi BS2007LED white light (2001ux) light source is fixed at 50cm above the back of the printing and dyeing cloth (45°incident angle), so as to be sensitive to the dyeing color difference of the cloth; the three above-mentioned cameras and light source devices are respectively Fi...

Embodiment 2

[0029] Embodiment 2, the detection of dyeing color difference (also known as front and back difference) before and after printing and dyeing cloth:

[0030]The detection equipment and method steps are the same as in Example 1, except that the RGB value (174, 27, 53) and saturation value ( 89) and chromaticity value (67) are stored in computer. The RGB value (183, 31, 68), saturation value (96) and chromaticity value (99) of the color of the dyed back end of the printed and dyed cloth (referring to the dyed cloth at the end of the dyed cloth) are compared and analyzed for judgment. The difference between RGB value, saturation value and chromaticity value exceeds the standard range for judging the qualified color difference of printing and dyeing cloth dyeing set in step D above (such as R difference value is 183-174=912, saturation difference is 96-89=718; among them, B value, chroma value greater than the allowable accuracy range of half-level color difference), it belongs to...

Embodiment 3

[0031] Example 3, detection of dyeing color difference (also known as batch difference or piece difference) between pieces of printed and dyed cloth:

[0032] The detection equipment and method steps are the same as in Example 1. According to the methods described in Example 1 and Example 2, the left, middle and right dyeing color difference and the front and back dyeing color difference detection of the whole piece of printing and dyeing cloth that is qualified and is a standard value are tested. The RGB value, saturation value, and chromaticity value of the middle and right (or front and back) positions are stored in the computer as the left, middle and right (or front and back) dyeing color difference of different batches of the same kind or different pieces of printing and dyeing cloth in the same batch The standard image template, real-time shooting images of different batches of the same kind or different pieces of printing and dyeing cloth in the same batch running onlin...

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Abstract

The invention is the online detection method of the machine vision system to the printing and dyeing color difference. It can solve the big working strength and the bad detection quality of detecting the color difference by human. The invention makes the standard image module of the detecting print-dyeing color difference according to the client sampling cloth, which the RGB value, saturation value and color value are as the standard value of detecting dyeing color difference; it uses the national nine-degree colorimetric card as the standard of dyeing color difference; the RGB value, saturation value and color value are set as the detection parameters and it sets the parameter precision range according to the user need. While the environment light changing, the invention can compensate the light strength of shoot image automatically to determine the production dyeing color difference precisely. The invention meets the practical condition of the user dyeing color difference detection and improves the precision and detection speed of the color difference detection.

Description

technical field [0001] The invention relates to the technical field of on-line detection by using a machine vision system, in particular to a method for on-line detection of printing and dyeing color difference of printed and dyed cloth by using a machine vision system at the production site of dyed and printed cloth. Background technique [0002] In the production workshop of printing and dyeing cloth in assembly line operation, the color difference of printing and dyeing of printing and dyeing cloth needs to be detected online. In the prior art, the on-line detection of printing and dyeing color difference of printed cloth relies on manual detection, and the dyeing color difference (also called side-center difference) of the left, middle and right of the cloth is manually and manually compared at the cloth drop of the pad dyeing machine, and compared according to international standards. The color card (nine levels in total) determines the color difference of dyeing, and t...

Claims

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Application Information

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IPC IPC(8): G01J3/46G01J3/52G06K9/46
Inventor 董仲伟
Owner WUXI ZHONGWANG 4D TECH
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