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SMTnet Express August 15, 2013, Subscribers: 26214, Members: Companies: 13451, Users: 35059

A Printed Circuit Board Inspection System With Defect Classification Capability

by I. Ibrahim, S. Bakar, M. Mokji, J. Mukred, Z. Yusof, Z. Ibrahim, K. Khalil, M. Mohamad; University Teknologi Malaysia - Faculty of Electrical Engineering

An automated visual PCB inspection is an approach used to counter difficulties occurred in human�s manual inspection that can eliminates subjective aspects and then provides fast, quantitative, and dimensional assessments.

In this study, referential approach has been implemented on template and defective PCB images to detect numerous defects on bare PCBs before etching process, since etching usually contributes most destructive defects found on PCBs. The PCB inspection system is then improved by incorporating a geometrical image registration, minimum thresholding technique and median filtering in order to solve alignment and uneven illumination problem. Finally, defect classification operation is employed in order to identify the source for six types of defects namely, missing hole, pin hole, underetch, short-circuit, mousebite, and open-circuit.

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Forum search results for related keywords: visual inspection , vision recognition, bare PCB

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Workshops and a technical conference in addition to exhibits from electronics assembly equipment manufacturers, assembly services and design companies.

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