Method of and apparatus for inspecting wiring pattern on printed

Details Method of and apparatus for inspecting wiring pattern on printed Method of and apparatus for inspecting wiring pattern on printed

1992-02-06

1993-12-21

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358106, G06K 900

Patent

active

052727629

ABSTRACT:
The image of a wiring pattern provided on a printed board is obtained and binarized. A square pixel operator comprised of a matrix of pixels is applied to the pattern image. Pixel trains extending in different directions are extracted from the result of applying the square operator. The numbers of pixels having the binary value "1" on the pixel trains are counted to obtain the respective sizes of the pattern image on the pixel trains. Signals representing the respective sizes are subjected to timing adjustment operation and to obtain the width of the wiring pattern on an area larger than the square operator.

REFERENCES:
patent: 4500202 (1985-02-01), Smyth
patent: 4794647 (1988-12-01), Forgues et al.
patent: 4830497 (1989-05-01), Iwata et al.

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