Circuit arrangement and method for operating a fingerprint...

Details Circuit arrangement and method for operating a fingerprint... Circuit arrangement and method for operating a fingerprint...

2007-07-03

2007-07-03

Mehta, Bhavesh M (Department: 2624)

Image analysis

Applications

Personnel identification

C382S319000

Reexamination Certificate

active

10203220

ABSTRACT:
A circuit and method are provided for ensuring that a fingerprint sensor is started automatically when a finger is rested thereon such that a sufficiently contrasting image can be produced. A difference between a maximum and a minimum value of the sensor signals is generated wherein, if the difference is sufficiently large, indicating a sufficient contrast of an image to be produced, a normal scanning operation of the fingerprint sensor is initiated, thus ensuring that the complete fingerprint image is produced, a normal scanning operation of the fingerprint sensor is initiated, thus ensuring that the complete fingerprint images produced are of satisfactory quality.

REFERENCES:
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patent: 4872203 (1989-10-01), Asai et al.
patent: 4924509 (1990-05-01), Yokomizo
patent: 5995640 (1999-11-01), Bolle et al.
patent: 6330345 (2001-12-01), Russo et al.
patent: 6483932 (2002-11-01), Martinez et al.
patent: 6741729 (2004-05-01), Bjorn et al.

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