Machine-vision-based method and device for intelligently detecting surface micro-defects of product

A technology of intelligent detection and machine vision, which is applied in the direction of optical testing flaws/defects, can solve problems such as poor and difficult detection of subtle defects, and achieve good and excellent detection results

Inactive Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology

[0003] Due to the uncertain factors of quality control during product production, various defects often occur on the surface of the product, among which there are effective avoidance methods or detection methods for large defects in production, while the detecti

Method used

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  • Machine-vision-based method and device for intelligently detecting surface micro-defects of product
  • Machine-vision-based method and device for intelligently detecting surface micro-defects of product

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Embodiment

[0020] Such as figure 1 , 2 shown. The intelligent detection device for micro-defects on the surface of machine vision products of the present invention includes a first conveyor belt 2, a second conveyor belt 3, a third conveyor belt 4 and a conveyor belt driving device, and the conveyor belt driving device is controlled by a PLC control system 5; it is characterized in that: the first conveyor belt 2 , The two sides of the second conveyor belt 3 and the third conveyor belt 4 are respectively provided with photoelectric sensors 16, 17, 18;

[0021] The upper of described second conveyor belt 3 is provided with coaxial light source 6, A camera 7 successively; A camera 7 is connected with image acquisition card 8, industrial control computer 11, DAQ data acquisition card 14, PLC control system 5 successively;

[0022] The top of the third conveyor belt 4 is provided with a non-uniform light source composed of a grating 9 and a parallel light source 10, and a B camera 12 is ar...

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Abstract

The invention discloses a machine-vision-based method and a machine-vision-based device for intelligently detecting surface micro-defects of a product. The device comprises a first conveying belt, a second conveying belt, a third conveying belt and a conveying belt driving device, wherein the conveying belt driving device is controlled by a PLC (Programmable Logic Control) system; photoelectric sensors are correspondingly arranged on both sides of the three conveying belts; a coaxial light source and a camera A are arranged on the second conveying belt; the camera A is connected with an image acquisition card, an industrial personal computer, a DAQ (Data Acquisition) card and the PLC system; a non-uniform light source composed of a grating and a parallel light source is arranged above the third conveying belt; a camera B is arranged above the side of the third conveying belt and connected with the image acquisition card; a servo motor of the parallel light source is connected with the PLC system; a defective product elimination unit is arranged at the side edge of the tail of the third conveying belt. By the cooperation of two stations, fine defects can be detected efficiently and accurately, and particularly, the effect of detecting the surface defects of mirror-surface-like products through the grating and the non-uniform light source at the second station is excellent.

Description

technical field [0001] The invention relates to machine vision automatic detection, in particular to an intelligent detection method and device for micro-defects on the surface of machine vision products. Background technique [0002] With the development of computer technology and automation technology, machine vision, as an emerging intelligent detection method, has been rapidly applied and promoted in various fields such as industry and agriculture after decades of development. Visual inspection can replace part of the functions of human eyes and brain, and can automatically identify and analyze the processing objects. It is a cutting-edge solution for modern industrial automation and intelligence. Machine vision is applied to product defect detection, which has the advantages of high efficiency, stability, and rapid identification of defects, and can avoid the fatigue of manual detection and the influence of subjective emotional factors. [0003] Due to the uncertain fa...

Claims

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Application Information

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IPC IPC(8): G01N21/89
Inventor 文生平刘云明王长明张维周国荣马淑林
Owner SOUTH CHINA UNIV OF TECH
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