Method for measuring position of hole

Details Method for measuring position of hole Method for measuring position of hole

1995-03-16

1998-06-23

Boudreau, Leo

Image analysis

Applications

Manufacturing or product inspection

382147, 382288, 348 94, G06K 900, G06K 936

Patent

active

057713090

ABSTRACT:
The position of a hole is measured by image-sensing a holed portion formed in a workpiece and then measuring the central position of the holed portion based on an image of the holed portion on a screen of an image sensing apparatus. A plurality of hole edge points which coincide with a hole edge of the image of the holed portion are picked up. A regression ellipse which represents the image of the holed portion from coordinates of the hole edge points is calculated. The central position of the holed portion is obtained from coordinates of the center of the regression ellipse.

REFERENCES:
patent: 4424588 (1984-01-01), Satoh et al.
patent: 4647208 (1987-03-01), Bieman
patent: 4776027 (1988-10-01), Hisano et al.
patent: 4791482 (1988-12-01), Barry et al.
patent: 4803735 (1989-02-01), Nishida et al.
patent: 5014331 (1991-05-01), Kurogane et al.
patent: 5086478 (1992-02-01), Kelly-Mahaffey et al.

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