Image analysis – Image sensing
Patent
1996-01-26
1999-10-05
Lee, Thomas D.
Image analysis
Image sensing
382124, 382115, G06K 700, G06K 900
Patent
active
059636793
ABSTRACT:
A fingerprint sensor includes an array of electric field sensing electrodes, a dielectric layer on the sensing electrodes with the dielectric layer for receiving a finger adjacent thereto, and a driver for applying an electric field drive signal to the sensing electrodes and adjacent portions of the finger so that the sensing electrodes produce a fingerprint image output signal. In one embodiment of the invention, the driver provides a coherent drive signal for the array. A respective shield electrode may be associated with each of the electric field sensing electrodes for shielding each electric field sensing electrode from adjacent sensing electrodes. Each shield electrode may be actively driven for further shielding. The fingerprint sensor preferably further includes a synchronous demodulator and contrast enhancer for more accurate output image signals. The fingerprint sensor may be effectively used to control access to a computer workstation. Method aspects are also disclosed.
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Chen Wenpeng
Harris Corporation
Lee Thomas D.
LandOfFree
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