1
Malcolm K Sparrow: Fingerprint recognition and retrieval system. Jim Zegeer, May 24, 1988: US04747147 (149 worldwide citation)

Fingerprints are scanned by a scanning system (13). Topological systems for coding and comparing fingerprints are described, including a system for recording a description of fingerprints. In a preferred embodiment, a central point of the fingerprint is selected as a center of rotating scan line. Th ...


2
Malcolm K Sparrow: Fingerprint recognition and retrieval system. Jim Zegeer, March 28, 1989: US04817183 (148 worldwide citation)

Fingerprints are scanned by a scanning system (13). Topological systems for coding and comparing fingerprints are described including a system for recording a description of fingerprints. In a preferred embodiment, a central point of the fingerprint is selected as a center of rotating scan line. The ...


3
Malcolm K Sparrow: Vector based topological fingerprint matching. Jim Zegeer Esq, May 20, 1997: US05631971 (45 worldwide citation)

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 ...