Detecting iris orientation
First Claim
Patent Images
1. A computer-implemented method comprising:
- obtaining an eye image;
determining a location of a center of an iris in the eye image;
generating a polar eye image based, in part, on the location of the center of the iris in the obtained eye image;
determining, using one or more processors, locations of one or more of an inner eye corner and an outer eye corner in the polar eye image;
determining one or more role angles based on the determined locations of the one or more of the inner eye corner and the outer eye corner in the polar eye image, the one or more role angles comprising a roll angle corresponding to a difference between a location of the center of the iris in the polar eye image and the location of one of the inner eye corner or the outer eye corner in the polar eye image; and
storing, in a storage unit, the one or more role angles as biometric sample features.
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Abstract
A method and system for determining a roll angle in an eye image is described. A center of an iris, an inner eye corner, and an outer eye corner in an eye image may be determined. The eye image may be normalized and transformed to a polar eye image using the center of the iris as a reference for the transformation. A shift associated with the inner eye corner and a shift associated with the outer eye corner may be determined. The shifts associated with the inner eye corner and the outer eye corner may be indicators of an orientation of the eye image or roll angle, and may be used for subsequent eye image processing and matching.
21 Citations
20 Claims
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1. A computer-implemented method comprising:
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obtaining an eye image; determining a location of a center of an iris in the eye image; generating a polar eye image based, in part, on the location of the center of the iris in the obtained eye image; determining, using one or more processors, locations of one or more of an inner eye corner and an outer eye corner in the polar eye image; determining one or more role angles based on the determined locations of the one or more of the inner eye corner and the outer eye corner in the polar eye image, the one or more role angles comprising a roll angle corresponding to a difference between a location of the center of the iris in the polar eye image and the location of one of the inner eye corner or the outer eye corner in the polar eye image; and storing, in a storage unit, the one or more role angles as biometric sample features. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer-readable storage medium comprising instructions, which, when executed by one or more computers, cause the one or more computers to perform actions comprising:
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obtaining an eye image; determining a location of a center of an iris in the eye image; generating a polar eye image based, in part, on the location of the center of the iris in the obtained eye image; determining locations of one or more of an inner eye corner and an outer eye corner in the polar eye image; determining one or more role angles based on the determined locations of the one or more of the inner eye corner and the outer eye corner in the polar eye image, the one or more role angles comprising a roll angle corresponding to a difference between a location of the center of the iris in the polar eye image and the location of one of the inner eye corner or the outer eye corner in the polar eye image; and storing, in a storage unit, the one or more role angles as biometric sample features. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
one or more computers and one or more storage devices storing instructions that are operable and when executed by one or more computers, cause the one or more computers to perform actions comprising; obtaining an eye image; determining a location of a center of an iris in the eye image; generating a polar eye image based, in part, on the location of the center of the iris in the obtained eye image; determining locations of one or more of an inner eye corner and an outer eye corner in the polar eye image; determining one or more role angles based on the determined locations of the one or more of the inner eye corner and the outer eye corner in the polar eye image, the one or more role angles comprising a roll angle corresponding to a difference between a location of the center of the iris in the polar eye image and the location of one of the inner eye corner or the outer eye corner in the polar eye image; and storing, in a storage unit, the one or more role angles as biometric sample features. - View Dependent Claims (16, 17, 18, 19, 20)
Specification