Metabolism- or Biochemical-Based Anti-Spoofing Biometrics Devices, Systems, and Methods
A biometric device for detecting biological tissue based upon ratiometric measurements of metabolic and/or biochemical intermediates is provided in which a radiation source ( 103 ) is electromagnetically coupled to a target region ( 125 ). A radiation sensor ( 155 ) receives emission signals ( 128 ) from the target region as a result of emitted radiation ( 121 ) interacting with the target region. A CPU ( 167 ) receives a signal from the sensor, and provides a biometric output signal based upon the presence of live, healthy tissue versus sham or dead tissue. Optionally, a conventional, non-metabolism, non-biochemical-based biometric sensor can be incorporated into the present invention, and the biometric output signal is then a result of both the metabolism- and/or biochemical based and non-metabolism non-biochemical-based biometric determinations. A method of performing this biometric analysis is also described.
1 . A metabolism-sensitive or biochemical-level-sensitive device comprising: an electromagnetic source for radiating a target region with electromagnetic radiation, said radiation selected to be absorbed by selected metabolites or biochemical components; a sensor configured to detect radiation backscattered or reemitted from said target region onto said sensor wherein said detected radiation preserves a signal related to said absorbance by said metabolites or biochemical components; and a calculation unit configured to generate, based upon said detected radiation, an output signal that is a function of the degree, presence, or absence of living or biological tissue within said target region.
2 . The device of claim 1 , wherein said radiation source is a broadband white LED.
3 . The device of claim 1 , wherein said radiation sensor is a CCD arranged so as to be wavelength sensitive.
4 . The device of claim 1 , wherein said determined output signal is configured to be a function of tissue hemoglobin or myoglobin saturation.
5 . The device of claim 1 , wherein said radiation source is an MRI field, and said radiation detector is an MRI coil.
6 . The device of claim 1 , wherein said radiation source is an NMR field, and said radiation detector is an NMR coil.
7 . The device of claim 1 , wherein said sensor further comprises a non-metabolism, non-biochemical-based biometric sensor, and wherein said output signal is a function both of said degree, presence, or absence of said living tissue, and of said non-metabolism, non-biochemical-based biometric sensor.
8 . The device of claim 7 , wherein said non-metabolism-based biometric sensor is a fingerprint sensor.
9 . The device of claim 7 , wherein said non-metabolism-based biometric sensor is a retinal-vessel sensor.
10 . A method of differentiating living metabolizing tissue from nonliving or sham tissue, comprising the steps of:
radiating a target region with electromagnetic radiation from an electromagnetic source;
detecting radiation backscattered or reemitted from the target region; and
determining, based upon the said detected radiation, a presence or absence of living tissue within the target region.
11 . The method of claim 10 further including the steps of:
performing a non-metabolism-based biometric identification; and
determining a positive or negative biometric identification match based upon both the presence or absence of living tissue and the non-metabolism-based identification.
12 . A biometric device for distinguishing between living and dead tissue, characterized in that: selected metabolites or biochemical components in said tissue are detected and analyzed to determine whether the tissue is living or dead.
13 . A biometric device for distinguishing between real and sham tissue, characterized in that: selected metabolites or biochemical components in said tissue are detected and analyzed to determine whether the tissue is living or dead.
14 . A security system for controlling access to an area, comprising:
a subject interface;
one or more devices comprising: an electromagnetic source for radiating a target region of a subject with electromagnetic radiation, said radiation selected to be absorbed by selected metabolites or biochemical components; and one or more sensors configured to detect radiation backscattered or reemitted from said target region onto said sensor wherein said detected radiation preserves a signal related to said absorbance by said metabolites or biochemical components; and
a microprocessor configured to analyze said signal and based upon said analysis to permit or deny access to said area.
15 . The system of claim 14 , wherein said radiation source is a broadband white LED.
16 . The system of claim 14 , wherein said radiation sensor is a CCD arranged so as to be wavelength sensitive.
17 . The system of claim 14 , wherein said signal is configured to be a function of at least one of tissue hemoglobin, hemoglobin saturation, myoglobin content, fat content, water content; or myoglobin saturation.
18 . The system of claim 14 , wherein said radiation source is an MRI field, and said radiation detector is an MRI coil.
19 . The system of claim 14 , wherein said radiation source is an NMR field, and said radiation detector is an NMR coil.