Method for recognizing a printed circuit board fiducial mark in

Details Method for recognizing a printed circuit board fiducial mark in Method for recognizing a printed circuit board fiducial mark in

1997-02-27

1999-09-14

Boudreau, Leo H.

Image analysis

Applications

Manufacturing or product inspection

382147, 382151, 348 87, 348126, 2505593, 356375, G06K 900

Patent

active

059534478

ABSTRACT:
Disclosed is a method for recognizing a printed circuit board fiducial mark in order to decide an origin point in a chip mounter so that electronic parts can be mounted on a desired position of the printed circuit board. Since the method can be used for a distorted image, it can exactly recognize a damaged object as well as a general object. The method can also reduce a calculation amount relative to a polarity number of a candidate object when the candidate object has the polarity number. The method can recognize a candidate object of the same pattern fiducial mark regardless of its size.

REFERENCES:
patent: 4475122 (1984-10-01), Green
patent: 5018212 (1991-05-01), Manns et al.
patent: 5086478 (1992-02-01), Kelly-Mahaffey et al.
patent: 5138667 (1992-08-01), Roch et al.
patent: 5621811 (1997-04-01), Roder et al.
patent: 5741114 (1998-04-01), Onodera

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