Iris recognition system
DCFirst Claim
1. A method of identification of a person, comprising:
- storing image information of at least a portion of the iris and pupil of the person'"'"'s eye;
illuminating an eye, of an unidentified person having an iris and a pupil;
obtaining at least one image of at least the same portion of the iris and pupil of the eye of the unidentified person; and
comparing at least the iris portion of the obtained image with the stored image information to identify the unidentified person.
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Abstract
Methods and apparatus are disclosed for identifying an eye, especially a human eye, on the basis of the visible features of the iris and pupil. The eye is first illuminated until the pupil reaches a predetermined size, at which an image of the iris and pupil is obtained. This image is then compared with stored image information for identification. The stored image information is previously obtained from an eye, the pupil of which was similarly brought to the same predetermined size. The illumination of the iris may include oblique illumination from several positions around the circumference of the iris. The illumination from each position may be relatively monochromatic, so that the resulting shadow will lack the color of the light source at that position, providing better contrast for elevation-depednent features. A system for performing iris recognition may include a processor which controls an illumination control circuit and a camera to obtain images at several predetermined sizes of the pupil.
529 Citations
32 Claims
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1. A method of identification of a person, comprising:
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storing image information of at least a portion of the iris and pupil of the person'"'"'s eye; illuminating an eye, of an unidentified person having an iris and a pupil; obtaining at least one image of at least the same portion of the iris and pupil of the eye of the unidentified person; and comparing at least the iris portion of the obtained image with the stored image information to identify the unidentified person. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system of identification, comprising:
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means for storing an image of at least a portion of the iris and pupil of a person'"'"'s eye; means for illuminating an eye having an iris and a pupil; means for obtaining an image of at least the same portion of the iris and pupil of the eye; and means for comparing at least the iris portion of the obtained image with the stored image information to identify the person. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification