Method and apparatus for inspecting line width on printed board

Details Method and apparatus for inspecting line width on printed board Method and apparatus for inspecting line width on printed board

1991-10-25

1993-12-21

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 27, 382 48, G06K 900

Patent

active

052727610

ABSTRACT:
An operator for detecting the width of a wiring line on a printed board comprises plurality of arms. Pixels on each arm increase in size toward the end of the arm. When the width of a narrow wiring line is detected on small pixels, while the width of a wide line is detected on large pixels. The operater is obtained by converting a wiring pattern signal into a plurality of signals corresponding to different pixel sizes and then combining respective parts of the plurality of signals with each other.

REFERENCES:
patent: 4500202 (1985-02-01), Smyth
patent: 4692943 (1987-09-01), Pietzsch et al.
patent: 4893346 (1990-01-01), Bishop
patent: 5027417 (1991-06-01), Kitakado et al.
patent: 5046120 (1991-09-01), Bishop

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