Fast Precise Positioning of Circular Mark in Automatic Optical Inspection

Guang Jie Xiong; Yu Fei Liu; Rui Zhen Liu

doi:10.4028/www.scientific.net/AMM.325-326.1614

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 325-326Fast Precise Positioning of Circular Mark in...

Fast Precise Positioning of Circular Mark in Automatic Optical Inspection

Abstract:

Captured circular marks are deformed sometimes when Automatic Optical Inspection (AOI) is used to detect various defects on Printed Circuit Boards (PCB), which may affect the precision of inspection. A new accurate positioning method of circular marks is proposed to solve the problem by obtaining the center of the most round ellipse based on the criterion that the ratio of the difference between the length and width of its circumscribed rectangle and the width of the rectangle is less than 0.1. The simulation tests show that, if the mark has much more deformations, the center positioning error of the proposed algorithm is about 0.013 pixels, and the running time is less than 40ms. Therefore, the proposed method provides good characteristics such as speediness, strong anti-interference ability and robustness.

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Periodical:

Applied Mechanics and Materials (Volumes 325-326)

Pages:

1614-1618

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.325-326.1614

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Online since:

June 2013

Authors:

Guang Jie Xiong, Yu Fei Liu, Rui Zhen Liu

Keywords:

Automatic Optical Inspection, Circular Mark, Elliptic Fitting, Hough Transform (HT), Otsu, Positioning

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