Communications: electrical – Digital comparator systems
Patent
1977-11-02
1979-05-22
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
G06K 900
Patent
active
041562305
ABSTRACT:
A method and apparatus for the smoothing and singularity detection of the ridge contour data of a fingerprint image for classification in an automatic fingerprint identification system. A template scanning window is passed electronically over a digital matrix of ridge contour data to generate a set of correlation values corresponding to each contour data element and to a plurality of reference angle vectors. The correlation values are processed for determination of peaks and valleys. Tests are conducted to determine whether the relative values of peaks and valleys and the relative spacing between peaks and valleys satisfy certain threshold criteria for reliable extraction of fingerprint singularity points for classification. The resultant data, representing the number of correlation peaks and the direction of each, defines the location and angular orientation of cores and deltas of a fingerprint.
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patent: 3699519 (1972-10-01), Campbell
patent: 3863218 (1975-01-01), Oka et al.
patent: 3899771 (1975-08-01), Saraga et al.
patent: 3979722 (1976-09-01), Sakoe
Ting, "Detection of the Core and Delta of Fingerprints", IBM Tech. Disclosure Bulletin, vol. 17, No. 2, Jul., 1974, pp. 406-407.
Bolton Norman L.
Brown Gerald D.
Capello Richard D.
Csiszer Alexander
Riganati John P.
Boudreau Leo H.
Hamann H. Fredrick
Humphries L. Lee
Pitts Rolf M.
Rockwell International Corporation
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