Title :
Inspection of printed circuit boards by connectivity preserving shrinking
Author :
Ye, Qin-Zhong ; Danielsson, Per E.
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ., Sweden
Abstract :
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.<>
Keywords :
computer vision; computerised pattern recognition; inspection; printed circuit manufacture; quality control; PCB manufacture; computer vision; computerised pattern recognition; connectivity preserving shrinking; edge irregularities; pipelined structure; printed circuit boards; quality control; sensitivity; visual inspection; Character recognition; Computer architecture; Computer vision; Drugs; Dynamic programming; Inspection; Pattern matching; Pattern recognition; Printed circuits; Toxicology;
Journal_Title :
Pattern Analysis and Machine Intelligence, IEEE Transactions on