METHOD AND APPARATUS FOR STANDOFF DETECTION OF LIVENESS
First Claim
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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Accused Products
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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Citations
35 Claims
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1. A method for remotely detecting whether a subject is alive, comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for remotely detecting whether a subject is alive, comprising:
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a viewer and an analyzer;
wherein the viewer comprises;
an objective and a beamsplitter which together form a first intermediate image and a second intermediate image;
a reticle placed in the plane of the first intermediate image;
an eyepiece for viewing the first intermediate image through the reticle;
an optical fiber bundle comprising a plurality of sub-bundles, a first end of the optical fiber bundle being disposed in the plane of the second intermediate image such that the plurality of sub-bundles splits a central region of the second intermediate image into a plurality of light signals; and
a sensor comprising at least one photodiode assembly, wherein at least one optical fiber sub-bundle is optically coupled to the photodiode assembly;
wherein the analyzer comprises;
a digital signal processor and a memory, such that the digital signal processor generates a liveness signal if a normalized subject spectral signature is substantially equivalent to a normalized calibration spectral signature template stored in the memory and otherwise generates a not live signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for remotely detecting whether a subject is alive, comprising:
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a hyperspectral imaging system comprising at least one camera for collecting a plurality of subject images formed by photons reflected from the subject, each image representing photons having wavelengths within a sub-portion of the electromagnetic spectrum;
an image processor comprising memory for storing a reference spectral signature image, and logic circuits for comparison of the subject images to the reference spectral signature image to determine whether the subject is alive; and
an output device to indicate whether the subject is alive. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method for remotely detecting whether a subject is alive, comprising the steps of:
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determining a calibration spectral signature for light reflectance from living skin;
storing the calibration spectral signature;
determining a subject spectral signature of the light reflectance of the subject whose liveness is to be determined, wherein the subject spectral signature is collected as an image comprising a plurality of pixels;
comparing the subject spectral signature with the calibration spectral signature;
generating a subject liveness signal for each pixel of the image, based on the comparison of the subject spectral signature for each pixel with the calibration spectral signature; and
displaying the subject liveness signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification