Methods for performing biometric recognition of a human eye and corroboration of same
First Claim
1. A method of biometric acquisition, comprising the steps of:
- projecting light, by an illuminator, of a predetermined wavelength onto an iris and a non-iris region;
measuring a reflectance of the iris and a reflectance of the non-iris region based on light reflected off the iris and the non-iris region;
comparing a ratio of the reflectance of the iris to the reflectance of the non-iris region, with a reflectance ratio pre-determined from a live eye using light of the same wavelength; and
determining that the iris is from a live eye if the ratio of the measured reflectances is consistent with the pre-determined reflectance ratio.
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Accused Products
Abstract
A method of biometric recognition is provided. Multiple images of the face or other non-iris image and iris of an individual are acquired. If the multiple images are determined to form an expected sequence of images, the face and iris images are associated together. A single camera preferably acquires both the iris and face images by changing at least one of the zoom, position, or dynamic range of the camera. The dynamic range can be adjusted by at least one of adjusting the gain settings of the camera, adjusting the exposure time, and/or adjusting the illuminator brightness. The expected sequence determination can be made by determining if the accumulated motion vectors of the multiple images is consistent with an expected set of motion vectors and/or ensuring that the iris remains in the field of view of all of the multiple images.
146 Citations
20 Claims
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1. A method of biometric acquisition, comprising the steps of:
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projecting light, by an illuminator, of a predetermined wavelength onto an iris and a non-iris region; measuring a reflectance of the iris and a reflectance of the non-iris region based on light reflected off the iris and the non-iris region; comparing a ratio of the reflectance of the iris to the reflectance of the non-iris region, with a reflectance ratio pre-determined from a live eye using light of the same wavelength; and determining that the iris is from a live eye if the ratio of the measured reflectances is consistent with the pre-determined reflectance ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An system of biometric acquisition, comprising:
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a illuminator projecting light of a predetermined wavelength onto an iris and a non-iris region; a sensor measuring a reflectance of the iris and a reflectance of the non-iris region based on light reflected off the iris and the non-iris region; and a processor comparing a ratio of the reflectance of the iris to the reflectance of the non-iris region, with a reflectance ratio pre-determined from a live eye using light of the same wavelength, and determining that the iris is from a live eye if the ratio of the measured reflectances is consistent with the pre-determined reflectance ratio. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification