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3D curved glass defect detection method based on stripe reflection

A curved glass and defect detection technology, which is applied in the field of intelligent optical defect detection, can solve the problems of curved glass surface detection, low detection efficiency, high missed detection rate, and high false detection rate

Inactive Publication Date: 2018-10-12
FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST +1
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Problems solved by technology

However, due to the non-planar arc on the surface of curved glass, traditional testing equipment cannot detect the surface of curved glass. It often requires a large number of production line workers to screen for a long time to detect the initial tensile force. However, under strong light for a long time The manual detection not only has a high missed detection rate and false detection rate, but also has low detection efficiency, and will also have a certain impact on workers' health products

Method used

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  • 3D curved glass defect detection method based on stripe reflection
  • 3D curved glass defect detection method based on stripe reflection
  • 3D curved glass defect detection method based on stripe reflection

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. The described embodiments are only some, not all, embodiments of the present invention.

[0036] A 3D curved surface glass defect detection method based on stripe reflection in this embodiment, such as figure 1 shown, including the following steps:

[0037] Step A: System calibration;

[0038] The steps are as follows:

[0039] Step A1: camera calibration;

[0040] The method adopted in the present invention is Zhang Zhengyou’s camera calibration method based on a plane calibration target, firstly determine the initial values ​​of the internal parameters and external parameters of the camera, then optimize the initial values ​​by the maximum likelihood estimation method, and finally calculate the radial distortion of the camera lens;

[0041] Step A2: Calibrate the position of the reference surfac...

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Abstract

The invention discloses a 3D curved glass defect detection method based on stripe reflection. The 3D curved glass defect detection method comprises system calibration, stripe pattern acquisition basedon a CCD industrial camera, and stripe pattern processing. The method utilizes the non-contact, high-speed and high-efficiency characteristics of the reflection stripe, greatly improves the efficiency of detecting the 3D curved glass, and prevents the error rate of manual detection. The accuracy of the method can reach the sub-micron level, meet the production testing requirements and help to improve the automation degree of the factory.

Description

technical field [0001] The invention relates to the technical field of intelligent optical defect detection, in particular to a 3D curved glass defect detection method based on fringe reflection. Background technique [0002] As the glass back cover of the mobile phone replaces the traditional metal case, the 3D curved glass cover plate has become a highlight. Its high-value appearance and excellent handle quickly become the new favorite of consumers, and gradually become the pursuit of domestic manufacturers. hot spot. 3D curved glass is mainly used in the protective screen and back cover of intelligent terminal products. Compared with traditional 2D or 2.5D glass, curved glass has the characteristics of light and thin, transparent and clean, anti-fingerprint, and anti-vertigo. [0003] After the production of 3D curved glass is completed, the surface of the glass screen needs to be inspected to determine its surface quality and whether there are appearance defects. Tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/958
CPCG01N21/8851G01N21/958G01N2021/888G01N2021/8887
Inventor 丁凯乐李力李志鹏张美杰魏登明
Owner FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST
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