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A defect detection method and device

A defect detection and area-to-be-measured technology, applied in measurement devices, optical testing flaws/defects, instruments, etc., can solve problems such as difficulty, system difficulty in wide-scale promotion, and increased deployment, achieving high speed, low cost, and easy deployment. Effect

Active Publication Date: 2020-10-16
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the systems using these technologies, on the one hand, require boards to be placed on specific trays during inspection, which increases the difficulty of deployment and use; scope promotion

Method used

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  • A defect detection method and device
  • A defect detection method and device

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0047] see figure 1 , is a flow chart of the defect detection method provided in Embodiment 1 of the present invention. Embodiment 1 of the present invention provides a defect detection method, including:

[0048] S11. Drive the camera to take N projection images of the PCB board; wherein, the N projection images are two-dimensional images presented on the PCB board when N projectors respectively project specific texture images to the PCB board, so The N projector...

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Abstract

The invention discloses a defect detection method. The defect detection method comprises the following steps: driving a camera to photograph N projection images of a PCB (Printed Circuit Board), wherein the N projection images are two-dimensional images which are represented on the PCB when specific texture images are projected to the PCB through N projectors respectively, the N projectors correspond to the PCB and N is greater than 1; according to the N projection images, obtaining contour maps which correspond to all the projection images one by one; according to the contour maps, comparing height of a region to be detected of the PCB with pre-determined standard height; according to a height comparing result, judging whether the region to be detected has height defects or not. Correspondingly, the invention further discloses a defect detection device. The defect detection method and device, disclosed by the invention, can be used for detecting the height of the region to be detected of the PCB and have the advantages of low cost, rapid speed and high precision; the problem that the extraction of structured light information is influenced by a shadow region caused by intensive elements on the PCB is overcome so that the detection precision is improved.

Description

technical field [0001] The invention relates to the field of automatic optical inspection, in particular to a defect inspection method and device. Background technique [0002] AOI (Automatic Optic Inspection, automatic optical inspection) is based on the optical principle to detect common defects encountered in the production of workpieces. It can replace manual searches for various appearance defects and component assembly errors on PCB boards, and can be efficient, accurate, and efficient. Save trouble and cost. When the system is working, the PCB board image is collected by the camera, and after image processing, it is compared with the qualified parameters in the database to check out the defects on the PCB board. [0003] However, traditional cameras and image sensors can only acquire two-dimensional images, lacking depth information, which poses great limitations to perception and understanding of real objects. At present, AOI mainly uses cameras to collect data, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
CPCG01N21/88G01N2021/8829
Inventor 罗汉杰
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD