Metal plate surface defect detection method based on machine vision

A metal sheet and defect detection technology, applied in the direction of optical testing flaws/defects, instruments, measuring devices, etc., can solve problems such as differences in judging the eligibility of limit parts, different methods, and strong reflection on the surface of metal sheets. , to achieve uniform curvature, eliminate the influence of specular reflection effect, and improve the detection efficiency.

Pending Publication Date: 2021-02-05
菲特(天津)检测技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] (1) In the long-term single repetitive work, workers are prone to fatigue, resulting in unqualified products flowing into the application market
[0007] (2) Different workers operate with different degrees of latitude and severity, and there will be corresponding differences in the judgment of the qualification of limit parts
[0008] (3) The surface of the metal sheet is strongly reflective, and the causes of defects are complex, and there are many problems in machine vision inspection

Method used

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  • Metal plate surface defect detection method based on machine vision
  • Metal plate surface defect detection method based on machine vision
  • Metal plate surface defect detection method based on machine vision

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Embodiment Construction

[0055] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

[0056] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected ...

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Abstract

The invention discloses a metal plate surface defect detection method based on machine vision, and relates to the technical field of digital image processing. The method includes: projecting red stripe light to the surface of a plate to highlight defects like pits, bulges and scratches, and acquiring a stripe projection image by using a CCD camera; decomposing a color image, highlighting the colorinformation of the light source and highlighting the color information of the light source; and extracting a stripe center, judging the distortion condition of the line through an algorithm, and reflecting the size of the defect. A stripe lighting mode is adopted, the influence of the mirror reflection effect is eliminated, meanwhile, the display force on the surface defects of the plate can be enhanced, and a defect image with high quality is obtained. For plate defects of different types, different forms and different positions, the detection effect is 100% adaptive, which indicates that the method is applicable to metal plate surface defect detection.

Description

technical field [0001] The disclosure of the present invention relates to the technical field of digital image processing, in particular to a method for detecting surface defects of metal plates based on machine vision. Background technique [0002] Sheet metal has an important application in the production of automobile bodies. The rapid development of the automobile industry has driven the mass production of sheet metal. While the demand for sheet metal has increased significantly, its quality has also attracted more and more attention. During the rolling process, due to reasons such as continuous casting billet, rolling equipment and rolling process, defects will be formed on the surface of the plate after rolling, which is not beautiful but also affects the life and performance of the plate. Therefore, many scientific research institutions and scholars at home and abroad have carried out research on the detection of sheet surface defects. [0003] Since the beginning of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N21/89G01N21/892
CPCG01N21/8806G01N21/8851G01N21/8914G01N21/892G01N2021/8809G01N2021/8829G01N2021/8874G01N2021/8887G01N2021/8918G01N2021/8908G01N2021/8924G01N2021/8925
Inventor 曹彬胡江洪袁帅鹏
Owner 菲特(天津)检测技术有限公司
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