Richard P Giles

Author:

Richard Giles

ISBN #:

0596101473

Author:

Richard Giles

ISBN #:

0596102305

Author:

Richard Giles

ISBN #:

0701625899

Author:

Richard Giles

ISBN #:

0814627099

Author:

Richard Giles

ISBN #:

0748761594

Author:

Richard Giles

ISBN #:

0864404522

US Patent:

55483941, Aug 20, 1996

Filed:

Mar 16, 1995

Appl. No.:

8/404931

Inventors:

Richard M. Giles - Laguna Niguel CA
Daniel J. Driscoll - Laguna Niguel CA
Eliseo Ranalli - Irvine CA
John M. Tamkin - Tucson AZ
Bradley Scott - Fountain Valley CA

Assignee:

Printrak International Inc. - Anaheim CA

International Classification:

G06K 920

US Classification:

356 71

Abstract:

A scanning fingerprint reader provides a set of digital data representing interface topology of a fingerprint pressed against a platen (20). The platen (20) is formed by one surface of a prism (10) utilizing total internal reflection of an illuminating beam (30) directed at an interior surface of the prism. The beam (37) that is output from the prism is fed through a scanning lens (40) to a scanning mirror (48) that causes the fingerprint image (68) to scan across a linear array (60) of CCD sensors that is repetitively sampled to provide a print readout of the entire surface of the prism for reading a slap print. The signal from the CCD array is read out and digitized (72,74,76) to provide a serial bit stream (78) representing the set of multiple fingerprints on the platen. An optical architecture (40,48,56) employing dual telecentricity eliminates keystoning distortion. A portion of the beam is sent to a linear CCD array (94) of a roll print camera to provide an estimate of the position of the line of contact of the finger during its rolling motion over the platen.