BIOIMPEDANCE SPOOF DETECTION
First Claim
1. A biometric sensor comprising:
- a platen;
a source electrode and a receiver electrode disposed on the platen;
an imaging system that operates to form an image of a purported skin site through the platen using optical wavelengths; and
a controller that operates to;
inject an input signal from the source electrode into a purported skin site that is coupled with the source electrode and the receiver electrode via the protective layer, thereby causing the receiver electrode to receive a response signal, the input signal comprising a plurality of frequencies;
interrogate the response signal to formulate a dispersive bioimpedance response of the purported skin site to the input signal over the plurality of frequencies; and
determine whether the purported skin site is a live finger according to the dispersive bioimpedance response.
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Accused Products
Abstract
Embodiments relate to bioimpedence-based spoof detection in an optical biometric reader. For example, embodiments operate in context of a biometric reader having a platen integrated with substantially transparent bioimpedance source and receiver electrodes covered by a substantially transparent protective layer. A multi-frequency input signal can be injected from the source electrode into a purported skin site (through the protective layer), so that a response signal is received by the receiver electrode. The response signal is interrogated to formulate a dispersive bioimpedance response of the purported skin site to the input signal over multiple frequencies. A biometric spoof determination can then be made according to the dispersive bioimpedance response. The spoof determination can be used for spoof detection, presence detection, and/or other functions.
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Citations
22 Claims
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1. A biometric sensor comprising:
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a platen; a source electrode and a receiver electrode disposed on the platen; an imaging system that operates to form an image of a purported skin site through the platen using optical wavelengths; and a controller that operates to; inject an input signal from the source electrode into a purported skin site that is coupled with the source electrode and the receiver electrode via the protective layer, thereby causing the receiver electrode to receive a response signal, the input signal comprising a plurality of frequencies; interrogate the response signal to formulate a dispersive bioimpedance response of the purported skin site to the input signal over the plurality of frequencies; and determine whether the purported skin site is a live finger according to the dispersive bioimpedance response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification