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Method for detecting surface defects

A technology for defect detection and detection, which is applied in the direction of optical testing flaws/defects, etc., can solve problems such as prone to missed inspections, reduce the probability of missed inspections, and improve accuracy

Pending Publication Date: 2018-11-16
深圳市创科自动化控制技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When taking pictures of the surface, it needs to be illuminated by a light source. Generally, the light source, camera and workpiece are relatively fixed. For some defects in certain directions on the surface of the workpiece, the position of the light source may be poor. The reason is not obvious in the captured image, and it is prone to missed detection, which needs to be improved

Method used

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  • Method for detecting surface defects

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the hardware of the surface defect detection method in Embodiment 1 is a camera 10 , a light source 20 and a server (not shown), and the server controls the camera 10 and the light source 20 to work together. The camera head 10 adopts a CCD camera. The light source 20 is a ring light source, which can be evenly divided into 8 independent light sources that can emit light independently, and each independent light source occupies an azimuth of 45 degrees. During detection, each segment of independent light sources is controlled by the server to emit light, and the sequence of light emission starts from any segment of the independent light sources, and emits light sequentially counterclockwise or clockwise along the circumferential direction. The light source 20 is arranged between the camera 10 and the workpiece 30. The lens of the camera 10 faces down and passes through the hollow part of the light source 20 and points to the surface of the wo...

Embodiment 2

[0023] Such as figure 2 As shown, the hardware of the surface defect detection method in Embodiment 2 is a camera 40, a light source 50, a workbench 70 and a server (not shown), and the server controls the camera 40, light source 50 and workbench 70 to work together. The camera 40 adopts a CCD camera. The light source 50 is a point light source, such as a light bulb composed of LED lamp beads. The light source 50 is arranged between the camera 40 and the workpiece 60, but the light source 50 is not in the space formed by the connection line between the lens of the camera 40 and each point on the surface of the workpiece 60 to be detected, so as to prevent the light source 50 from blocking the surface of the workpiece 60 and causing surface area leakage. check. Different from the first embodiment, the light source 50 of the second embodiment is fixed, the camera 40 and the workpiece 60 can rotate synchronously (around the A axis), and the workpiece 60 is driven to rotate by ...

Embodiment 3

[0030] Such as figure 2 As shown, the hardware of the surface defect detection method in the third embodiment is a camera 40 , a light source 50 and a server (not shown), and the server controls the camera 40 and the light source 50 to work together. The camera 40 adopts a CCD camera. The light source 50 is a point light source, such as a light bulb composed of LED lamp beads. The light source 50 is arranged between the camera 40 and the workpiece 60, but the light source 50 is not in the space formed by the connection line between the lens of the camera 40 and each point on the surface of the workpiece 60 to be detected, so as to prevent the light source 50 from blocking the surface of the workpiece 60 and causing surface area leakage. check. Different from the second embodiment, the light source 50 of the third embodiment is rotatable, and the camera 40 and the workpiece 60 are fixed, and such a structure is relatively simpler than that of the second embodiment. In the t...

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Abstract

The invention relates to a method for detecting surface defects. The method comprises: illuminating a workpiece surface to be detected through light sources at different angles when a camera photographs the surface to be detected of the workpiece every time, fusing the images into a final image and recognizing surface detects on the final image. The light sources at different angles are used in each shooting process and the images are fused so that surface detects in different images are shown in different degrees. After fusion of multiple images, the surface detects in the final image are obvious shown so that the probability of missed detection is reduced and the accuracy of the test results is improved.

Description

technical field [0001] The invention relates to a method for detecting surface defects, in particular to a method for detecting surface defects by taking multiple images. Background technique [0002] Defect detection usually refers to the detection of surface defects of objects. At present, defect detection systems are most widely used on metal surfaces, glass instant noodles, paper surfaces, and electronic component surfaces, etc., which have strict requirements on appearance and have clear indicators. Surface defect detection uses advanced machine vision detection technology to detect spots, pits, scratches, color differences, defects and other defects on the surface of the workpiece. The usual surface defect detection will use the CCD lens to capture the surface of the workpiece to obtain images, and then identify various defects in the images. When taking pictures of the surface, it needs to be illuminated by a light source. Generally, the light source, camera and work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
CPCG01N21/88
Inventor 余茂松
Owner 深圳市创科自动化控制技术有限公司
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