Invariant radial iris segmentation
First Claim
1. A method of identifying a subject by biometric analysis of the iris of an eye, the method comprising the steps of:
- (1) acquiring an image of an iris of the subject;
(2) radially segmenting the iris image into a plurality of radial segments;
(3) for each radial segment, determining data for a data set for a single predetermined one dimensional feature within said segment relative to a reference value of said feature within said image; and
(4) constructing a template for said subject comprising said data for each of said radial segments; and
wherein;
at least steps 2-4 are performed using a programmed computing device; and
said feature is peaks of color intensity within the iris; and
said data comprises magnitudes of said peaks and their relative locations along a direction radially outward from a center of a pupil in the image of the iris of the subject.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and computer product are presented for identifying a subject by biometric analysis of an eye. First, an image of the iris of a subject to be identified is acquired. Texture enhancements may be done to the image as desired, but are not necessary. Next, the iris image is radially segmented into a selected number of radial segments, for example 200 segments, each segment representing 1.8° of the iris scan. After segmenting, each radial segment is analyzed, and the peaks and valleys of color intensity are detected in the iris radial segment. These detected peaks and valleys are mathematically transformed into a data set used to construct a template. The template represents the subject'"'"'s scanned and analyzed iris, being constructed of each transformed data set from each of the radial segments. After construction, this template may be stored in a database, or used for matching purposes if the subject is already registered in the database.
400 Citations
36 Claims
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1. A method of identifying a subject by biometric analysis of the iris of an eye, the method comprising the steps of:
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(1) acquiring an image of an iris of the subject; (2) radially segmenting the iris image into a plurality of radial segments; (3) for each radial segment, determining data for a data set for a single predetermined one dimensional feature within said segment relative to a reference value of said feature within said image; and (4) constructing a template for said subject comprising said data for each of said radial segments; and wherein; at least steps 2-4 are performed using a programmed computing device; and said feature is peaks of color intensity within the iris; and said data comprises magnitudes of said peaks and their relative locations along a direction radially outward from a center of a pupil in the image of the iris of the subject. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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2. The method of claim wherein step (2) comprises the steps of:
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(2.1) determining the center of the pupil of said subject; and (2.2) determining a pupil-iris border in said image; and (2.3) radially segmenting said iris into a plurality of radial segments of equal angular size. - View Dependent Claims (3, 4)
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5. A method of identifying a subject by biometric analysis of the iris of an eye, the method comprising the steps of:
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(1) acquiring an image of an iris of the subject; (2) radially segmenting the iris image into a plurality of radial segments; (3) for each radial segment, determining data for peaks of color intensity within the radial segment of the iris relative to a reference value of a peak of color intensity within the iris image; and (4) constructing a template for the subject comprising the data for each of the radial segments; (5) encoding the data into a data set;
the encoding comprising;determining an order of the peaks in the radial segment; assigning a first value to each peak having a magnitude that is greater than a preceding peak in the order; assigning a second value to each peak having a magnitude that is lesser than a preceding peak in the order; and placing the values in said data set in accordance with the order wherein; at least steps 2-4 are performed using a programmed computing device.
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21. A non-transitory computer-readable medium for identifying a subject by biometric analysis of the iris of an eye, the product comprising:
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a first computer executable instruction media for acquiring an image of an iris of the subject; a second computer executable instruction media for radially segmenting the iris image into a plurality of radial segments; a third computer executable instruction media for determining data for a single predetermined one dimensional feature, wherein said feature comprises a peak and/or valley of color intensity within said segment of the iris relative to a reference value of said feature within said image, wherein said reference value is peak or valley of color intensity selected to represent each radical segment, and wherein said data comprises relative magnitudes of at least one peak and/or valley and relative locations of said at least one peak and/or valley along a direction radially outward from a center of a pupil of said subject; and a fourth computer executable instruction media for constructing and storing a template for said subject comprising said data set for each of said radial segments. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification