Combined total-internal-reflectance and tissue imaging systems and methods
First Claim
1. A system for performing a biometric function, the system comprising:
- an illumination source;
a platen disposed to make contact with a skin site of an individual;
a light detector;
an optical train disposed to provide optical paths between the illumination source and the platen and to provide optical paths between the platen and the light detector, wherein the combination of the illumination source and optical train provides illumination to the platen under multispectral conditions;
a computational unit interfaced with the light detector and having instructions to generate a total-internal-reflectance image of the skin site from a first portion of light received from the skin site and to generate a multispectral tissue image of the skin site from a second portion of light received from the skin site; and
determining a liveness state of tissue at the skin site from the multispectral tissue image.
2 Assignments
0 Petitions
Accused Products
Abstract
Methods and systems are provided for combining total-internal-reflectance and tissue imaging to perform biometric functions. The system may include an illumination source, a platen, a light detector, an optical train, and a computational unit. The platen is disposed to make contact with a skin site of an individual. The optical train is disposed to provide optical paths between the illumination source and the platen, and between the platen and the light detector. The combination of the illumination source and optical train provides illumination to the platen under multispectral conditions. The computational unit is interfaced with the light detector and has instructions to generate a total-internal-reflectance image of the skin site from a first portion of light received from the skin site, and to generate a tissue image of the skin site from a second portion of light received from the skin site.
315 Citations
25 Claims
-
1. A system for performing a biometric function, the system comprising:
-
an illumination source; a platen disposed to make contact with a skin site of an individual; a light detector; an optical train disposed to provide optical paths between the illumination source and the platen and to provide optical paths between the platen and the light detector, wherein the combination of the illumination source and optical train provides illumination to the platen under multispectral conditions; a computational unit interfaced with the light detector and having instructions to generate a total-internal-reflectance image of the skin site from a first portion of light received from the skin site and to generate a multispectral tissue image of the skin site from a second portion of light received from the skin site; and determining a liveness state of tissue at the skin site from the multispectral tissue image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for performing a biometric function, the method comprising:
-
illuminating a skin site of an individual under multispectral conditions; receiving light from the skin site; generating a total-internal-reflectance image of the skin site from a first portion of the received light; generating a multispectral tissue image of the skin site from a second portion of the received light; and determining a liveness state of tissue at the skin site from the multispectral tissue image. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A method for performing a biometric function, the method comprising:
-
capturing a first image of a skin site of an individual under a first set of optical conditions; capturing a second image of the skin site of the individual under a second set of optical conditions different from the first set, wherein a polarization state of the first set of optical conditions is different from a polarization state of the second set of optical conditions and/or wherein light incident on the skin site under the first set of optical conditions has a different wavelength composition than light incident on the skin site under the second set of optical conditions; using the first and second images to perform the biometric function; and determining a liveness state of tissue at the skin site from the first and second images.
-
Specification