NDLI: Development of an Automatic Stencil Inspection System Using Modified Hough Transform and Fuzzy Logic

Content Provider	IEEE Xplore Digital Library
Author	Kyung-Jin Choi Young-Hyun Lee Jong-Woo Moon Chong-Kug Park Harashima, F.
Copyright Year	1982
Abstract	In this paper, the authors present a system to inspect metal stencil that is used to print solder paste on pads of surface-mounted device on printed circuit board. The developed inspection system is composed of a moderately precise X-Y robot and a vision system. To correct a position error caused by the X-Y robot, the authors define position error vector and apply modified Hough transform to determine the dominant position error vector. Using this extracted dominant position error vector, the reference image is modified. This transformed reference image is compared with the camera image. Fuzzy logic is utilized to judge the correctness of the holes on the stencil. The input variables are the ratio of the overlapped area of two holes and the distance between the centroid of them. The output variable is the grade of the identity of the hole. These methods are verified by a simulation and applied to the inspection system
Sponsorship	IEEE Industrial Electronics Society
Starting Page	604
Ending Page	611
Page Count	8
File Size	720091
File Format	PDF
ISSN	02780046
Volume Number	54
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inspection Fuzzy logic Error correction Robot vision systems Error analysis Moon Printed circuits Machine vision Printing Service robots stencil (metal mask) Automatic inspection system fuzzy logic modified Hough transformation (MHT)
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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