Title:
PRINTED CIRCUIT BOARD WELDING SPOT DEFECT DETECTION METHOD BASED ON DIGITAL IMAGE PROCESSING
Document Type and Number:
WIPO Patent Application WO/2024/087640
Kind Code:
A1
Abstract:
Disclosed in the present invention is a printed circuit board welding spot defect detection method based on digital image processing. The method comprises the following steps: step 1, collecting a template picture and an original picture of a printed circuit board to be subjected to detection; step 2, preprocessing the template picture and a picture to be subjected to detection; step 3, performing particle-swarm-optimization(PSO)-based maximum inter-class variance (i.e. OTSU) thresholding on the preprocessed template picture and the preprocessed picture to be subjected to detection; step 4, according to the template picture and by using a FLANN optimization SURF algorithm, performing image registration on the picture to be subjected to detection, which has been subjected to thresholding; step 5, by using an image subtraction method, performing subtraction on a registered picture to be subjected to detection and the template picture, so as to obtain a difference image; and step 6, performing binarization on the difference image, and performing morphological processing such as an opening operation of corrosion followed by dilation, so as to finally locate a position with a defect. The detection method in the present invention is simple, is high in practicability, and can significantly improve the accuracy of detection.
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Inventors:
ZUO JIANCUN (CN)
CHANG YUANPEI (CN)
XUE YING (CN)
ZHANG YU (CN)
SUN JINGGUO (CN)
JI ZHANGYUAN (CN)
LI HEWEI (CN)
CHANG YUANPEI (CN)
XUE YING (CN)
ZHANG YU (CN)
SUN JINGGUO (CN)
JI ZHANGYUAN (CN)
LI HEWEI (CN)
Application Number:
PCT/CN2023/098804
Publication Date:
May 02, 2024
Filing Date:
June 07, 2023
Export Citation:
Assignee:
UNIV SHANGHAI POLYTECH (CN)
International Classes:
G06T7/00; G06N3/00; G06T3/00; G06T5/00; G06T5/30; G06T5/50; G06T7/136; G06T7/30
Foreign References:
| CN115546182A | 2022-12-30 | |||
| CN114187247A | 2022-03-15 | |||
| CN105405136A | 2016-03-16 | |||
| CN102411777A | 2012-04-11 | |||
| CN110503633A | 2019-11-26 | |||
| CN112489002A | 2021-03-12 |
Attorney, Agent or Firm:
SHANGHAI TECHNOVO INTELLECTUAL PROPERTY AGENT FIRM (CN)
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