Method of normalizing a digital image of an iris of an eye
First Claim
Patent Images
1. A method of normalizing a digital image of an iris of an eye of a vertebrate, including a human vertebrate, for the purpose of creating an iris code for use in the identification of the vertebrate, the method comprising the steps of:
- determining a pupil region in the image as a convex region having a boundary that can only be described by more than five independent parameters;
determining, in the image, an outer boundary of the iris; and
transforming an image of a ring shaped iris region that surrounds the pupil region into a coordinate system in which each point of the iris region is described by a first coordinate that indicates the position of the point along the boundary of the pupil and a second coordinate that indicates the distance of the point from said boundary, said second coordinate having a constant value when the point is located on the outer boundary of the iris.
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Abstract
A method of normalizing a digital image of an iris of an eye for the purpose of creating an iris code for identification of vertebrates, including humans, the method comprising the steps of:
- determining a pupil region in the image as a convex region having a boundary that can only be described by more than five independent parameters;
- determining, in the image, an outer boundary of the iris; and
- transforming an image of a ring shaped iris region that surrounds the pupil region into a coordinate system in which each point of the iris region is described by a first coordinate that indicates the position of the point along the boundary of the pupil and a second coordinate that indicates the distance of the point from said boundary, said second coordinate having a constant value when the point is located on the outer boundary of the iris.
32 Citations
15 Claims
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1. A method of normalizing a digital image of an iris of an eye of a vertebrate, including a human vertebrate, for the purpose of creating an iris code for use in the identification of the vertebrate, the method comprising the steps of:
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determining a pupil region in the image as a convex region having a boundary that can only be described by more than five independent parameters; determining, in the image, an outer boundary of the iris; and transforming an image of a ring shaped iris region that surrounds the pupil region into a coordinate system in which each point of the iris region is described by a first coordinate that indicates the position of the point along the boundary of the pupil and a second coordinate that indicates the distance of the point from said boundary, said second coordinate having a constant value when the point is located on the outer boundary of the iris. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of creating a binary iris code from image data of an eye of a vertebrate, including a human vertebrate, the method comprising:
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normalizing a digital image of an iris of the eye, wherein the normalizing step comprises determining a pupil region in the image as a convex region having a boundary that can only be described by more than five independent parameters, determining an outer boundary of the iris in the image, and transforming an image of a ring shaped iris region that surrounds the pupil region into a coordinate system in which each point of the iris region is described by a first coordinate that indicates the position of the point along the boundary of the pupil and a second coordinate that indicates the distance of the point from said outer boundary, said second coordinate having a constant value when the point is located on the outer boundary of the iris; and filtering the digital image of the iris to produce the iris code, wherein the iris code is a compressed representation of the digital image. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification