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METHOD AND APPARATUS FOR STANDOFF DETECTION OF LIVENESS

  • US 20070268485A1
  • Filed: 12/07/2005
  • Published: 11/22/2007
  • Est. Priority Date: 12/07/2004
  • Status: Active Grant
First Claim
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1. 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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