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Inspection of printed circuit boards by connectivity preserving shrinking
September 1988 (vol. 10 no. 5)
pp. 737,738,739,740,741,742
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.<>

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Index Terms:
quality control,computer vision,computerised pattern recognition,inspection,printed circuit manufacture,pipelined structure,PCB manufacture,computer vision,quality control,computerised pattern recognition,printed circuit boards,connectivity preserving shrinking,visual inspection,sensitivity,edge irregularities,Inspection,Printed circuits,Dynamic programming,Character recognition,Pattern matching,Drugs,Toxicology,Computer vision,Computer architecture,Pattern recognition
Citation:
"Inspection of printed circuit boards by connectivity preserving shrinking," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, no. 5, pp. 737,738,739,740,741,742, Sept. 1988, doi:10.1109/34.6785
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