Locating curvilinear objects using feathered fiducials

Details Locating curvilinear objects using feathered fiducials Locating curvilinear objects using feathered fiducials

1994-01-14

1996-03-19

Mancuso, Joseph

Image analysis

Pattern recognition

Template matching

382291, G06K 962

Patent

active

055009069

ABSTRACT:
A method and apparatus for locating curvilinear objects of variable scale in digitized images using feathered fiducials. The leathered fiducials are constructed by: defining a range of tolerated object size scale variations; generating an enlarged submodel within the range of tolerated scale variations and assigning background pixel values exterior to the enlarged submodel; generating a reduced size submodel within the range of tolerated scale variations and assigning foreground pixel values to the reduced size submodel; disposing the reduced size submodel within and tangent to the enlarged submodel at the application point; uniformly changing grey scale pixel values in a graduated manner from foreground to background between the reduced size submodel and the enlarged one. The curvilinear objects are then located by conducting searches using the constructed fiducials.

REFERENCES:
patent: 4643579 (1987-02-01), Toriumi et al.
patent: 4648053 (1987-03-01), Fridge
patent: 4757550 (1988-07-01), Uga
patent: 5189711 (1993-02-01), Weiss et al.
patent: 5204911 (1993-04-01), Schwartz et al.
Efrat et al. "Subpixel Image Registration Using Circular Fiducials" Proc. 2nd Israel Symp. Theory and Comput. Systems, Jun. 1993, pp. 49-58.
Computer Vision, by Ballard & Brown, publ. by Prentice-Hall, Inc. 1982, pp. 65-70.

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