Finger identification

Details Finger identification Finger identification

1983-03-07

1985-10-01

Punter, William H.

Optics: measuring and testing

Document pattern analysis or verification

G06K 920

Patent

active

045442673

ABSTRACT:
A finger pressed against a platen or a fingerprint card provides a fingerprint object which is scanned by an interrogating beam of collimated light that is linearly displaced across the platen thereby maintaining a constant angle between the interrogating light beam and the plane of the object being scanned. As the beam scans across the fingerprint object, the reflected light beam is modulated. The modulated beam is imaged onto a linear array of photo-responsive devices to provide a series of output signals indicative of modulation information. The outputs of the devices are serially interrogated at each of successive scan positions to provide a set of signals containing fingerprint information.

REFERENCES:
patent: 3138059 (1964-06-01), White
patent: 3174414 (1965-03-01), Myer
patent: 3443098 (1969-05-01), Lewis
patent: 3614737 (1971-10-01), Sadowsky
patent: 3619060 (1971-11-01), Johnson
patent: 3743421 (1973-07-01), Maloney
patent: 4003656 (1977-01-01), Leventhal
patent: 4053228 (1977-10-01), Schiller
patent: 4210899 (1980-07-01), Swonger et al.
patent: 4322163 (1982-03-01), Schiller

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