Connectivity in Digital Pictures
Journal of the ACM (JACM)
Digital Picture Processing
Cellular image processing techniques for VLSI circuit layout validation and routing
DAC '82 Proceedings of the 19th Design Automation Conference
Novel method for analysis of printed circuit images
IBM Journal of Research and Development
Thinning Methodologies-A Comprehensive Survey
IEEE Transactions on Pattern Analysis and Machine Intelligence
Linear onesided stability of MAT for weakly injective 3D domain
Proceedings of the seventh ACM symposium on Solid modeling and applications
An object-oriented approach to the concurrent engineering of electronics assemblies
Computers in Industry
Wavelet-based printed circuit board inspection algorithm
Integrated Computer-Aided Engineering
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Two algorithms for visual inspection of printed-circuit boards are presented that perform width checking of conductors and insulators. The first detects the difference between the results of shrinking and connectivity-preserving shrinking (CPS). The second algorithm produces a difference between the original and the shrunk picture. This result is subject to a number of CPS-operations after which errors are easily detected. Both algorithms can be adapted to a suitable level of sensitivity to sharp corners and edge irregularities. A sequential version of CPS is also described which is well suited for hardware implementation in a pipelined structure.