Method and apparatus for generating a multiple tolerance, three

Details Method and apparatus for generating a multiple tolerance, three Method and apparatus for generating a multiple tolerance, three

1990-07-27

1992-11-10

Harkcom, Gary V.

Image analysis

Histogram processing

For setting a threshold

382 8, 382 1, 358106, 358101, G06F 1562

Patent

active

051631288

ABSTRACT:
A method and apparatus used with a printed circuit board (PCB) defect detection system generates a reference data base image of the PCB having tolerances for each individual PCB feature. The invention includes a transitional data base having three states, black, white and gray corresponding to areas where the PCB features respectively must appear, must not appear and may or may not appear.

REFERENCES:
patent: 4578810 (1986-03-01), MacFarlane et al.
patent: 4783826 (1988-11-01), Koso
patent: 4859999 (1989-08-01), Koso
patent: 4941182 (1990-07-01), Patel

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