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Defect detection method based on transmission structured light

A defect detection and structured light technology, which is applied in measuring devices, material analysis through optical means, instruments, etc., can solve problems that are not conducive to workers' health and corporate interests

Inactive Publication Date: 2019-07-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Eye detection is neither good for workers' health nor good for business interests

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  • Defect detection method based on transmission structured light
  • Defect detection method based on transmission structured light
  • Defect detection method based on transmission structured light

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Embodiment Construction

[0073] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] The present invention proposes a defect detection method based on transmitted structured light, which is used to detect surface defects of objects with high transmittance, and can realize defect detection and identification in a non-contact, simple and fast manner. The detection system designed by this method can directly Detect defect information on the measured object, which can be applied to large-sized and large-curvature measured objects. Figure 1(a) and Figure 1(b) show the structure diagram of the detection system, and Figure 1(c) shows the optical path diagram, the detection system includes structured light illumination module, image acquisition module, system control and data processing module. The structured light lighting module is composed of an LCD liquid crystal display. The display generates a ...

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Abstract

The invention discloses a defect detection method based on transmission structured light, and is used for detecting the defects of a detected object with high transmissivity. The method comprises thefollowing steps that: firstly, generating stripe structured light, projecting the stripe structured light to the surface of the detected object, and after the stripe structured light is transmitted through the detected object, generating deformed stripe structured light; collecting the deformed stripe structured light, and utilizing a modulation degree technology to convert a collected light intensity graph into a modulation degree graph; and combining with a subsequent algorithm to obtain the surface defect information of the detected object. The method is especially suitable for the defect detection of a large-size large-curvature glass cover plate. Compared with a reflection system, a transmission system which is put forward by the invention eliminates the influence of parasitic stripes, improves the stripe contrast ratio of a collected image, improves the signal-to-noise ratio of an original image and improves a measurement result. In a whole detection process, a complex calibration process is not required, the height information of the object does not need to be subjected to integral reconstruction, errors brought by an integral algorithm are avoided, and the method has the characteristics of being quick, easy in operation, simple and practical.

Description

technical field [0001] The invention belongs to the field of defect detection and identification, and relates to a defect detection method based on transmitted structured light, in particular to a transmitted structured light illumination method to detect and identify surface defects of objects with high transmittance, and is especially suitable for large-size and large-curvature Defect on glass cover of 3D electronic display. Background technique [0002] With the increasing maturity of glass production technology, glass has become an indispensable part of our basic necessities of life. Due to its high hardness (Mohs hardness is 8H), glass is resistant to scratches, has good surface strength to resist falling and compression, and has excellent light transmission performance, excellent surface finish, excellent metallic texture. Glass panels are more and more widely used in electronic displays, such as the substrate of liquid crystal displays, or the protective glass of TV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/958
CPCG01N21/958
Inventor 岳慧敏黄易杨方宇耀刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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