Multispectral liveness determination
First Claim
Patent Images
1. A method of determining a liveness state of purported tissue, the method comprising:
- illuminating the purported tissue under a plurality of distinct optical conditions during a single illumination session;
receiving light scattered from the purported tissue separately for each of the plurality of distinct optical conditions, wherein the plurality of distinct optical conditions includes at least a first optical condition that includes light with wavelengths within a first wavelength band and a second optical condition that includes light with wavelengths within a second wavelength band, the second wavelength band being distinct from the first wavelength band; and
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deriving a multispectral image of the purported tissue from the received light; and
verifying that the derived multispectral image is consistent with living tissue using a processor.
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Abstract
Methods and systems are provided for determining a liveness state of purported tissue. The purported tissue is illuminated under a plurality of distinct optical conditions during a single illumination session. Light scattered from the purported tissue is received separately for each of the plurality of distinct optical conditions. A multispectral image of the purported tissue is derived from the received light. It is verified that the derived multispectral image is consistent with living tissue.
289 Citations
21 Claims
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1. A method of determining a liveness state of purported tissue, the method comprising:
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illuminating the purported tissue under a plurality of distinct optical conditions during a single illumination session; receiving light scattered from the purported tissue separately for each of the plurality of distinct optical conditions, wherein the plurality of distinct optical conditions includes at least a first optical condition that includes light with wavelengths within a first wavelength band and a second optical condition that includes light with wavelengths within a second wavelength band, the second wavelength band being distinct from the first wavelength band; and
;deriving a multispectral image of the purported tissue from the received light; and verifying that the derived multispectral image is consistent with living tissue using a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A liveness detector comprising:
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a platen adapted for placement of purported tissue; an illumination source disposed to illuminate the purported tissue when placed on the platen under a plurality of distinct wavelengths; an imaging system disposed to receive light scattered from the purported tissue; and a controller interfaced with the illumination source and the imaging system, the controller including; instructions to illuminate the purported tissue with the illumination source under a plurality of distinct wavelengths during a single illumination session; instructions to derive a multispectral image of the purported tissue from light received by the imaging system separately for each of the plurality of wavelengths; and instructions to verify that the derived multispectral image is consistent with living tissue. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A detector comprising:
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a platen adapted for placement of purported tissue; a first illumination source disposed to illuminate the purported tissue when placed on the platen with light of a first wavelength; a second illumination source disposed to illuminate the purported tissue when placed on the platen with light of a second wavelength; an imaging system disposed to receive light scattered from the purported tissue; and a controller interfaced with the illumination source and the imaging system, the controller including; instructions to illuminate the purported tissue with the first illumination source and the second illumination source during a single illumination session; and instructions to derive a multispectral image of the purported tissue from light received by the imaging system separately for the first wavelength and the second wavelength.
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Specification