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Journal of Electronic Imaging

Two-stage high-precision visual inspection of surface mount devices
Author(s): Hong Kyu Chung; Rae-Hong Park
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Paper Abstract

A two-stage high-precision algorithm for detecting the orientation and position of the surface mount device (SMD) is described. In the preprocessing step, a coarse orientation of the SMD is obtained by line fitting. A high-precision fuzzy Hough transform (FHT) is applied to the corner points to estimate precisely the orientation of the device, with its position determined by using four detected corner points. The FHT employed has a real-valued accumulator over the limited range of angles that is determined in the preprocessing step. Computer simulation with a number of test images shows that the parameters obtained by the presented algorithm are more accurate than those by conventional methods such as the moment method, projection method, and Hough transform methods. It can be applied to fast and accurate automatic inspection and placement systems.

Paper Details

Date Published: 1 October 1997
PDF: 8 pages
J. Electron. Imaging. 6(4) doi: 10.1117/12.276900
Published in: Journal of Electronic Imaging Volume 6, Issue 4
Show Author Affiliations
Hong Kyu Chung, Sogang Univ. (South Korea)
Rae-Hong Park, Sogang Univ. (South Korea)

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