Method and apparatus for detecting faults in an object

Details Method and apparatus for detecting faults in an object Method and apparatus for detecting faults in an object

1987-01-30

1989-10-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

73598, 356237, 358106, 382 34, G06K 962

Patent

active

048767271

ABSTRACT:
The subject of the invention is a method and a device for detecting faults in or on an object. The object form is measured and then compared with a master form. In this comparison one point and one line of the object form and of the master form with reference to a coordinate system, are brought into coincidence by shifting the form or master form. Partial forms and partial master forms are then displaced relative to one another in partial areas of the coordinate system until a maximum overlap is detected. Then the nonoverlapping points of the partial forms are checked for faults.

REFERENCES:
patent: 3576534 (1969-08-01), Steinberger
patent: 4079416 (1978-03-01), Faani
patent: 4091394 (1978-05-01), Kashioka
patent: 4111557 (1978-09-01), Rottenkolber
patent: 4160385 (1979-07-01), Gromlich
patent: 4435835 (1984-03-01), Sakow
patent: 4579455 (1986-04-01), Levy
patent: 4613234 (1986-09-01), Cruickshank
patent: 4635293 (1987-01-01), Watanabe
patent: 4644582 (1987-02-01), Morishita et al.
patent: 4707734 (1987-11-01), Labinger

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