A system and method for detecting surface defects of mirror objects that remove the influence of dust
A technology for object surface and defect detection, which is applied in the field of optical imaging, can solve problems such as the difficulty of distinguishing dust spots, and achieve the effects of avoiding errors, overcoming limitations, and compact structure
Active Publication Date: 2019-12-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0005] The invention provides a system and method for detecting surface defects of mirror objects. The detection system and method proposed by the invention solve the problem that the traditional detection system based on the principle of modulation degree is difficult to distinguish between point defects and dust points, and improves the accuracy of detection. , and the operation is simple and fast
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[0034] The principles and characteristics of the present invention will be described in detail below in conjunction with specific implementation methods and accompanying drawings:
[0035] combine figure 1 and figure 2 , the present embodiment provides a glass cover surface defect detection system that eliminates the influence of dust, which is characterized in that it includes: a structured light illumination module 1, a polarization analysis module 2, an image acquisition module 3 and an image data processing module; The spatial positions of the module 1, the surface of the glass cover plate 4 to be tested and the image acquisition module 3 form an oblique projection and oblique shooting mode, and a polarization detection module 2 is arranged between the image acquisition module 3 and the glass cover plate 4 to be tested. The structured light illumination module 1 outputs linearly polarized structured light and coded structured light step by step, and the light is imaged ...
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The invention discloses a system and method for detecting defects on the surface of a mirror surface object that eliminates the influence of dust, and belongs to the technical field of optical imaging. The present invention introduces a polarization analyzer into the traditional oblique projection and oblique shooting detection system based on the principle of modulation degree analysis, and realizes the recognition of surface dust information of mirror objects based on the principle that linearly polarized structured light is scattered by dust to change the polarization state. By comparing and analyzing with the defect and dust distribution information map, the surface defect information of the mirror object to be tested can be obtained without the influence of dust. The detection system of the present invention has a compact structure, overcomes the limitation of traditional detection requiring a large amount of manual detection; avoids the complicated calibration process, and does not need integral reconstruction of the height information of the object to be measured, and avoids the error caused by the integral algorithm; at the same time, it solves the problem of The traditional detection system based on the principle of modulation has the problem that it is difficult to distinguish point defects from dust points; therefore, the detection system and detection method of the present invention have the advantages of accuracy, simplicity, speed and practicality.
Description
technical field [0001] The invention belongs to the technical field of optical imaging, in particular to a system and method for detecting defects on the surface of a mirror surface object that eliminates the influence of dust. Background technique [0002] With the increasing maturity of glass technology, glass has become an indispensable part of our basic necessities of life. Due to its high hardness (Mohs hardness is 8H), glass is scratch-resistant, excellent light transmission performance, good surface strength makes it resistant to falling and compression, excellent surface finish, and excellent metal texture . Glass panels are more and more widely used in electronic displays, such as the substrate of liquid crystal displays, protective glass for TVs, laptops, pads, and mobile phones. [0003] In the production of glass cover plates, a certain proportion of defective glass cover plates will be produced due to reasons such as materials and manufacturing techniques. Fo...
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IPC IPC(8): G01N21/88
CPCG01N21/88G01N2021/8829
Inventor 岳慧敏宋一平周政方宇耀黄易杨刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA