Abstract

In this paper, a high-resolution algorithm for detecting the orientation and position of the SMD and an algorithm for compensating the position and skew angle of the PCB are proposed. The proposed algorithm for the first topic consists of two parts. Its first part is a preprocessing step. in which corner points of the SMD are detected and they are grouped. Then the coarse angle of the principal axis is obtained by line fitting. The second part is a main processing step, in which the fuzzy Hough transform over the limited range of angles is applied to the corner points to detect precisely the orientation of the SMD. The position of the SMD is determined by using its four corner points. The proposed algorithm for the second topic is the one which detects a rotation angle and translation parameters of the PCB using a template matching method. The computer simulation shows that the parametes obtained by proposed algorithms are more precise than those by the several conventional methods considered. The proposed algorithms can be applied to the fast and accurate automatic inspection systems.

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1. Shin, Dong-Won ; You, Jun-Ho 1999. "Measurement of maximum deviation of leads using partial image of SMD mounted on PCB" 제어·자동화·시스템공학 논문지 = Journal of control, automation and systems engineering, 5(6): 698~704  원문보기 상세보기
2. Lee, Hyeong-Geun ; Lee, Moon-Kyu 2001. "An Automated Machine-Vision-based Feeding System for Engine Mount Parts" 한국정밀공학회지 = Journal of the Korean Society of Precision Engineering, 18(5): 177~185  원문보기 상세보기
3. 2003. "Inspection System for The Metal Mask" 電子工學會論文誌. Journal of the Institute of Electronics Engineers of Korea. SC, 시스템 및 제어, 40(2): 1~9  원문보기 상세보기