Method for finding contours in an image of an object

Details Method for finding contours in an image of an object Method for finding contours in an image of an object

2005-09-06

2005-09-06

Miriam, Daniel (Department: 2621)

Image analysis

Pattern recognition

Feature extraction

C382S149000

Reexamination Certificate

active

06941016

ABSTRACT:
A method is provided for robustly and efficiently identifying contours in an image of an object. Features are extracted from an image, typically using a Sobel edge detector or a set of large oriented filters, and are locally chained to form contour segments of particular character, such as line segments. A spatial hash table is used to access the contour segments according to the location of their endpoints. Candidate sets for joining to grow contours are reduced by considering only segments having ends in adjacent spatial hash bins. Contour constraints are applied to appropriately choose among the candidates to form contours. The method facilitates robust and efficient scratch detection of fiber-optic end faces, or of any surface that may have smoothly curved scratches.

REFERENCES:
patent: 4876729 (1989-10-01), Watanabe et al.
patent: 5179419 (1993-01-01), Palmquist et al.
patent: 5319734 (1994-06-01), Buzzetti
patent: 5535002 (1996-07-01), Csipkes et al.
patent: 5543915 (1996-08-01), Csipkes et al.
patent: 5596672 (1997-01-01), Harman et al.
patent: 5600439 (1997-02-01), Csipkes et al.
patent: 5636020 (1997-06-01), Csipkes et al.
patent: 5657131 (1997-08-01), Csipkes et al.
patent: 5671049 (1997-09-01), Csipkes et al.
patent: 5727327 (1998-03-01), Wakabayashi et al.
patent: 5729622 (1998-03-01), Csipkes et al.
patent: 5729966 (1998-03-01), Grulick
patent: 5768401 (1998-06-01), Csipkes et al.
patent: 5768409 (1998-06-01), Csipkes et al.
patent: 5809162 (1998-09-01), Csipkes et al.
patent: 5857047 (1999-01-01), Strand et al.
patent: 5857049 (1999-01-01), Beranek et al.
patent: 5862250 (1999-01-01), Csipkes et al.
patent: 5898494 (1999-04-01), Csipkes et al.
patent: 5923781 (1999-07-01), Csipkes et al.
patent: 5995212 (1999-11-01), Dar et al.
patent: 6069991 (2000-05-01), Hibbs-Brenner et al.
patent: 6088498 (2000-07-01), Hibbs-Brenner et al.
patent: 6105396 (2000-08-01), Glodis et al.
patent: 6108444 (2000-08-01), Syeda-Mahmood
patent: 6183343 (2001-02-01), Buzzetti
patent: 6753965 (2004-06-01), Kumar et al.
Evan Lubofsky, Machine vision takes guesswork out of fiber-polishing inspection, Laser Focus World, Sep., 2001.

Affiliated with

Also associated with

Rating

Method for finding contours in an image of an object does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for finding contours in an image of an object, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for finding contours in an image of an object will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3428837