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Device and method for detecting surface defects of surface with periodical patterns

A defect detection and periodic technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of poor stability, high equipment cost, slow processing speed, etc., to reduce requirements, solve high equipment cost, The effect of increasing the matching speed

Inactive Publication Date: 2011-11-23
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems existing in the background technology, the object of the present invention is to propose a surface defect detection device and method with periodic patterns, which can effectively solve the problems of high equipment cost, slow processing speed and poor stability in the detection of periodic pattern defects. question

Method used

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  • Device and method for detecting surface defects of surface with periodical patterns
  • Device and method for detecting surface defects of surface with periodical patterns
  • Device and method for detecting surface defects of surface with periodical patterns

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Embodiment

[0036] In this embodiment, the selected object to be inspected is a strip photo frame, which is characterized in that the surface of the photo frame is flat and has periodic patterns on the surface.

[0037] as attached figure 1 The schematic diagram of the structure and principle is shown. In this embodiment, the CCD black and white area array GigE camera adopts the DALSA M1400 type, the resolution is 1360*1024, and the lens matched with the camera is a Computar2 / 3 "JC series lens with a focal length of 25mm. The light source Ose DM-75 is used, Intel PRO / 100MT is used for gigabit network card, McBean SBN04SDK is used for motor, McBean VN04N is used for driver, and Omron CP1H is used for PLC.

[0038] The operation flow of the whole detection process is as follows:

[0039] After the entire detection system is turned on, the motor is connected with the ball screw through the reducer to realize the horizontal movement of the workbench and the strip photo frame. The driver is ...

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Abstract

The invention discloses a device and method for detecting the defects of a surface with periodical patterns. In the device disclosed by the invention, a motor is connected with a ball screw through a speed reducer; a nut on the ball screw is connected with a workbench; a driver is respectively connected with a PLC (Programmable Logic Controller) and an encoder arranged on the motor; the PLC controls the rotating speed of the motor through the driver; a dome-shaped light source is installed above a detected object; a CCD (Charge Coupled Device) black and white linear array GigE camera is installed above the dome-shaped light source; and a kilomega network card is respectively connected with the CCD black and white linear array GigE camera, a PC (Personal Computer) and the PLC. According to the invention, a collected image is used as a source image and an image collected in advance is used as a target image, hierarchical search is carried out by adopting a pattern pyramid, normalization cross correlation coefficients are used as similarity measurement, thereby reducing the computing quantity in the matching process, enhancing matching speed, reducing the requirements for the camera and solving the problems of high equipment cost, low processing speed, poor stability and the like in periodical pattern defect detection.

Description

technical field [0001] The invention relates to machine vision online detection technology, in particular to a surface defect detection device and method with periodic patterns. Background technique [0002] Machine vision technology is to use computers and cameras to simulate human visual systems to obtain information about objective things, and process and understand the information through computer image processing technology, and finally realize the detection, measurement and recognition of target things. [0003] The use of machine vision technology for surface inspection has a wide range of applications, such as product packaging inspection, cloth pattern inspection and surface inspection of paper printed matter. There are many algorithms for surface detection in machine vision technology, and they are highly targeted. Appropriate surface detection algorithms should be selected for different surface conditions. [0004] For surface detection with periodic patterns, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/898
Inventor 孙坚孔红红钟绍俊陈乐富雅琼谢敏俞甫
Owner CHINA JILIANG UNIV
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