Image analysis – Applications – Personnel identification
Patent
1994-07-15
1997-05-20
Boudreau, Leo
Image analysis
Applications
Personnel identification
382209, G06K 900
Patent
active
056319711
ABSTRACT:
A fingerprint recognition and retrieval system in which the positions of fingerprint minutiae points and an index number for each minutiae point are recorded in a storage medium. The local ridge flow direction in the vicinity of each minutiae point defined by ridge endings and ridge bifurcations is determined and a generating line is projected at an angle to the local ridge flow direction. The generating line has a length sufficient to span a predetermined number of ridges to each side of each of the minutiae points. Each ridge is traced, in two directions, from the point of crossing of the projected generating line along any crossed ridge line. The first occurring topological event is assigned a type code (T) to the topological event. A topological event code vector is generated for each minutiae comprising an ordered sequence of topological type codes encountered during the tracing and any associated minutiae reference numbers and sets of the vectors are stored in a machine searchable database. The matching algorithm systematically develops connected cluster of minutiae points within an unknown one of the fingerprints for which there exists a matching cluster of minutiae points within the fingerprint under comparison and wherein the topological relationships among the set of minutiae within the matching clusters are substantially identical.
REFERENCES:
patent: 4747147 (1988-05-01), Sparrow
patent: 4944021 (1990-07-01), Hoshino et al.
patent: 4947442 (1990-08-01), Tanaka et al.
A Topological Approach to the Matching of Single Fingerprints: Development of Algorithms for use on Rolled Impressions Sparrow et al National Bureau of Standards Publication NBS 500-124 May 1985.
A Topological Approach to the Matching of Single Fingerprints: Development of Algorithms for use on Latent Fingermarks Sparrow et al National Bureau of Standards Publication NBS 500-126 Oct. 1985.
Boudreau Leo
Tran Phuoc
Zegeer, Esq. Jim
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