System and method for fingerprint validation
View Patent ↗The invention provides a system and method for rapid validation of identity from tissue using registered two dimensional and optical coherence tomography (OCT) scan images. The preferred embodiment provides, for a human fingerprint, validation that the surface fingerprint matches the primary fingerprint. An alternate embodiment provides validation of “aliveness” by ascertaining blood flow. Various embodiments are taught.
1. A method of validating a fingerprint, said method comprising:
selecting a relative positioning of an optical coherence tomography system and a separate surface imaging device, with respect to each other;
performing an optical coherence tomography scan to produce at least one cross sectional tomographic scan of said fingerprint, said scan including the interface of the epidermis and the dermis;
obtaining a surface image of said fingerprint;
validating, by comparing said cross sectional tomographic scans of said fingerprint with said surface image of said fingerprint, that said cross sectional tomographic scan is compatible with the corresponding region of said surface image;
outputting result of said validation step.
2. The method of claim 1 , wherein further including the step of obtaining a plurality of a cross sectional tomographic scans at substantially the same location, thereby enabling in less than one second, determination of whether blood flows in said fingerprint.
3. The method of claim 1 wherein the step of performing optical coherence tomography scan includes using multiple reference optical coherence tomography.
4. A system for fingerprint validation, said system comprising:
an optical coherence tomography system, generating cross sectional tomographic scans of said fingerprint;
a surface imaging system, generating surface images of said fingerprint, where said optical coherence tomography system and said surface imaging system are in a preselected physical relationship with respect to each other such that said surface image and said cross sectional tomographic scan are registered;
a processor module, said processor module containing memory, electronic control and processing, surface imaging control and processing; and
wherein said processor module validates, by comparing said cross sectional tomographic scans of said fingerprint with said surface image of said fingerprint, that said cross sectional tomographic scan is compatible with the corresponding region of said surface image;
and transmits validation status of said fingerprint.
5. The system of claim 4 , wherein said surface imaging system is one of:
a Charge Couple Device imaging system with an aperture through which the optical coherence tomography probe beam can be applied to the target;
an imaging system that is transparent at the wavelength of the optical coherence tomography system;
an ultra-sonic imaging array such as a capacitive micro-machined ultrasonic transducer (CMUT);
a camera;
a thin-film pressure switch array.
6. The system of claim 5 wherein said surface imaging system is off set from the optical coherent tomography probe beam.
7. The system of claim 4 , wherein said optical coherence tomography system obtains said cross sectional tomographic scan and obtains said surface image.
8. The system of claim 5 wherein said surface imaging system includes a probe beam, and said probe beam is one of: an RF beam, an ultrasound beam.
9. The system of claim 4 wherein said optical coherence tomography system obtains a plurality of cross sectional tomographic scans at substantially the same area, enabling in a time span of less than one second a determination of blood flow in said fingerprint.