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Device and method for automatic detection of object appearance based on machine vision

An automatic detection device and machine vision technology, applied in the field of image processing, can solve problems such as false detection, high missed detection rate, restrictions on the development of the magnetic material industry, and high subjectivity in detection

Active Publication Date: 2020-08-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

The method of manual full inspection to detect defects is highly subjective, and the rate of false detection and missed detection is high, which greatly limits the development of the magnetic material industry.

Method used

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  • Device and method for automatic detection of object appearance based on machine vision
  • Device and method for automatic detection of object appearance based on machine vision

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Experimental program
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Embodiment

[0025] Example: see figure 1 , a magnetic material automatic detection method, the magnetic material length and width between 4-8mm, method steps are as follows:

[0026] a. Preliminary detection and debugging, setting the parameters of the vision system, the vision system is composed of a camera and a lens;

[0027] To set the vision system parameters is to set the camera parameters. In the size detection station, the camera color mode is black and white, the resolution is 1626*1236, the ccd size is 1 / 1.8, the frame rate is 20fps, the digital interface is GigE, the lens parameter is set, and the magnification is 0.4x , the working distance is 110mm, the optical distortion is 0.02, and the depth of field is 5.3mm; in the appearance inspection station, the camera color mode is black and white, the resolution is 1296*966, the ccd size is 1 / 3, the frame rate is 30fps, the digital interface GigE, the lens parameter setting, The focal length is 50mm, the aperture value is F1.8, th...

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Abstract

The invention discloses an object appearance automatic detection device and method based on machine vision. The invention relates to the field of image processing, in particular to a magnetic material defect detection method. The image of the magnetic material is obtained by means of a device with two light sources, and the image is processed to obtain the position of the curve of the magnetic material and the number of defects, thereby realizing the purpose of the invention. Therefore, the present invention can clearly distinguish the sample from the background, the defect part and the normal part of the sample, and can accurately identify the area and quantity of the defect. Different testing standards can be formulated by the customer, and different abbreviation standards allow different defect numbers and defect areas. , to meet the needs of different customers.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a magnetic material defect detection method. Background technique [0002] In the production process of magnetic materials, it is difficult to realize the automatic detection of defects due to the complex process, various types of surface coatings, and the performance of current testing equipment. At present, most of the domestic manufacturers adopt the manual full inspection method for magnetic materials. The method of manual full inspection to detect defects is highly subjective, and the rate of false detection and missed detection is high, which greatly limits the development of the magnetic material industry. In response to this problem, automatic detection of magnetic material defects is realized through machine vision technology. Contents of the invention [0003] The purpose of the present invention is to provide a magnetic material detection method that solves the prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/892G01B11/00
CPCG01B11/00G01N21/892
Inventor 张静刘笑寒陈祥刘城作刘霖刘娟秀倪光明杜晓辉刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA