Method and apparatus for detecting neck disconnection between la

Details Method and apparatus for detecting neck disconnection between la Method and apparatus for detecting neck disconnection between la

1991-11-14

1995-03-14

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 28, 382 26, 348126, G06K 900

Patent

active

053982916

ABSTRACT:
A method and apparatus for detecting neck disconnection between a land and a line in a wiring pattern on a printed board includes a scanner for obtaining images of the wiring pattern and a through hole formed in the pattern. The image of the wiring pattern is converted to a line image representing a wiring line by thinning the pattern image. A window encompassing the image of the through hole is defined, and part of the thinned pattern image overlapping the window is extracted. The number of end points of the thinned pattern image is counted in the window. If the number of the end points is an odd number larger than one, it is determined that neck disconnection is present in the wiring pattern.

REFERENCES:
patent: 4555798 (1985-11-01), Broadbent, Jr. et al.
patent: 5027417 (1991-06-01), Kitakado et al.
patent: 5119434 (1992-06-01), Bishop et al.
patent: 5144681 (1992-09-01), Kitakado et al.
patent: 5150422 (1992-09-01), Kitakado et al.
patent: 5214712 (1993-05-01), Yamamoto et al.

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