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Transparent or translucent medium defect detection system and method

A translucent medium, defect detection technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of difficult automatic judgment and detection of products, and achieve the effect of accurate relative position judgment and comprehensive accuracy.

Inactive Publication Date: 2021-05-04
VOMMA (SHANGHAI) TECH CO LTD
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  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a confocal-based optical field transparent or translucent medium defect detection system, which is used to solve the problems in the prior art that the internal defects of products made of transparent or translucent medium are difficult to be automatically detected by machine vision. Judgment detection problem

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  • Transparent or translucent medium defect detection system and method
  • Transparent or translucent medium defect detection system and method
  • Transparent or translucent medium defect detection system and method

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Embodiment Construction

[0025] The embodiment of the present invention provides a new solution direction for three-dimensional defect detection by using a light field camera. The light field camera adds a microlens array between the sensor and the main lens of a conventional camera, and then records the propagation direction of the light to form a unique light field image encoded by the lens array. The light field image is processed and rendered, and then three-dimensional images can be obtained. information. A light field camera is a passive 3D measurement method, so it can perform defect detection and 3D measurement through transparent or semi-transparent media.

[0026] Confocal lasers use the confocal principle to obtain the relative height between two surfaces of a transparent object with a single laser projection, and the accuracy of the confocal laser is high, usually the accuracy in the z direction is about 1u, used for transparent or translucent The upper and lower surfaces of the media are...

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Abstract

A transparent or translucent medium defect detection system comprises: an object to be detected, at least one light source, a confocal laser and a light field camera. The object is made of a transparent or translucent medium. The light rays of the light source irradiate the object to be detected. The confocal laser is used for acquiring distance data of the surface of the object to be detected relative to the confocal laser by irradiating the object to be detected. The light field camera is used for shooting to obtain the image of the object to be detected, and detecting the three-dimensional defect existing in the transparent or semitransparent medium of the object to be detected according to the obtained image of the object to be detected.

Description

technical field [0001] The invention belongs to the technical field of product defect detection, in particular to a transparent or translucent medium defect detection system and method. Background technique [0002] In recent years, with the rapid growth of technology and industrial level, the mass production of consumer screen electronics, large-screen displays, lenses, mirrors and other products, the continuous application of curved screens and bendable screens, these screens will use transparent or Translucent medium material. As digital products have higher and higher quality requirements for such transparent or translucent media, the three-dimensional defect detection of transparent or translucent media has always been one of the most difficult issues in industrial appearance inspection. [0003] Three-dimensional defect detection technology is a core technology in the field of machine vision and measurement. Three-dimensional defect detection refers to identifying ob...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/958
CPCG01N21/01G01N21/958
Inventor 李浩天
Owner VOMMA (SHANGHAI) TECH CO LTD