Method and apparatus for standoff detection of liveness

Details Method and apparatus for standoff detection of liveness Method and apparatus for standoff detection of liveness

2005-12-07

2008-08-26

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

C356S051000, C356S419000, C382S115000

Reexamination Certificate

active

07417727

ABSTRACT:
A method for remotely detecting whether a subject is alive, comprising the steps of determining a calibration spectral signature for light reflectance from living skin, normalizing the calibration spectral signature values to the calibration reflectance value at a reference wavelength, storing the normalized calibration spectral signature, determining a subject spectral signature of the light reflectance of a region of skin of the subject whose liveness is to be determined, normalizing the subject spectral signature values to the subject reflectance value at the reference wavelength, comparing the normalized subject spectral signature with the normalized calibration spectral signature for at least one wavelength, generating a subject liveness signal based on the comparison of the normalized subject spectral signature with the normalized calibration spectral signature, and emitting the subject liveness signal.

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Attas, M, et al., “Visualization of cutaneous hemoglobin oxygenation and skin hydration using near-infrared spectroscopic imaging”, Skin Research and Technology, vol. 7., 2001, pgs. 238-245.
PCT International Search Report for PCT/US2005/044648.

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