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3D shape obtaining method and device applied to object surface defect detection

A defect detection and acquisition method technology, which is applied in the direction of measuring devices, optical devices, and optical testing of defects/defects, can solve problems such as low efficiency, high missed detection rate, and high cost, and achieve high detection accuracy, avoid loss, and reliability good sex effect

Pending Publication Date: 2022-05-17
WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, manual visual inspection is mostly used for surface defect detection, which is low in efficiency and high in cost.
Although there are some equipment on the market that use machine vision technology for surface defect detection, because the surface of some objects to be tested is not a two-dimensional planar structure, there are normal functional 3D shapes and small-sized irregular defect 3D shapes. The existing surface defect detection system adopts the method of directly acquiring images from a single angle or performing differential processing on images acquired by multiple cameras, which cannot obtain complete feature information of surface defects, so there is a problem of high missed detection rate
[0003] A few devices take into account the 3D shape of the object to be inspected, but they use the method of difference between light and dark. In fact, only part of the surface 3D shape information of the object to be inspected can be obtained. Therefore, most surface defect systems using the existing technology have a tendency to miss detection. high problem

Method used

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  • 3D shape obtaining method and device applied to object surface defect detection
  • 3D shape obtaining method and device applied to object surface defect detection
  • 3D shape obtaining method and device applied to object surface defect detection

Examples

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Embodiment 1

[0019] A kind of 3D topography acquisition device that this example involves, such as figure 1 As shown, the non-coaxial light source 3D profile acquisition device includes a rotating platform 1, a rotating adjustable bracket 2, a line-scanning camera 3, a line-scanning light source 4, a stage 6, and a storage and computing unit 7; Connect the rotating adjustable bracket 2, and the rotating platform 1 can make the rotating adjustable bracket 2 achieve a horizontal rotation of 0-360° under the drive of the electric rotating table inside; the line scan camera 3 and the light source are installed on the rotating adjustable bracket 2 At both ends, when the relative positions of the line scan camera 3 and the line light source remain unchanged, the whole can rotate with the rotating adjustable bracket, and the angle of rotation is consistent with the angle of the electric rotary table inside the rotating platform; at the same time, the line scan camera 3 and the The line light sour...

Embodiment 2

[0030] Another 3D topography acquisition device involved in this example, such as figure 2 As shown, the coaxial light source 3D profile acquisition device includes a line-scan camera, a coaxial light source, a stage, and a storage and computing unit.

[0031] Wherein, below the line scan camera 3 is a coaxial parallel light source, below the coaxial light source 8 is the stage 6, and the upper surface of the stage 6 carries the object to be measured 5; the CD side of the upper surface of the stage 6 can be Under the action of the servo screw lifting device inside the stage 6, the height of this side relative to the bottom surface can be adjusted accurately, so as to realize the inclination of the upper surface relative to the bottom surface at a certain angle, so as to take pictures of the object under test at different angles; the object under test is fixed On the stage 6, the stage 6 can reciprocate along the direction (parallel to the AC side) of the vertical line-scannin...

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Abstract

The invention relates to the technical field of object surface defect detection, in particular to a 3D shape obtaining method and device applied to object surface defect detection, which can obtain the complete 3D shape of the surface of an object to be detected so as to effectively improve the defect detection precision. The relative spatial positions of the object to be measured and the shooting mechanism (including a camera and a light source) are continuously adjusted according to set parameters, a plurality of surface images of the object to be measured are obtained, the obtained images are synthesized, and 3D shape information of the surface of the object to be measured is obtained; the continuous adjustment of the spatial position of the to-be-measured object according to the set parameters comprises relative rotation of the to-be-measured object on the plane and the camera according to a set angle or lifting / descending of the to-be-measured object on the plane and the camera according to the set angle; and performing scale invariant feature transform (SIFT) on the obtained image to complete image synthesis processing.

Description

Technical field: [0001] The invention relates to the technical field of object surface defect detection, in particular to a 3D shape acquisition method and device for object surface defect detection that can obtain a complete 3D shape on the surface of the object to be tested, thereby effectively improving the accuracy of defect detection. Background technique: [0002] At present, manual visual inspection is mostly used for surface defect detection, which is low in efficiency and high in cost. Although there are some equipment on the market that use machine vision technology for surface defect detection, because the surface of some objects to be tested is not a two-dimensional planar structure, there are normal functional 3D shapes and small-sized irregular defect 3D shapes. The existing surface defect detection system adopts the method of directly acquiring images from a single angle or performing differential processing on images acquired by multiple cameras, which cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01B11/24
CPCG01N21/8851G01B11/24G01N2021/8887
Inventor 辛菊盛尹虎刘伟刘成永梁明明刘晓炜
Owner WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH