Iris recognition system

Details Iris recognition system Iris recognition system

G - Physics

06

K

354/57

G06K 9/00 (2006.01) A61B 3/12 (2006.01) G06K 9/20 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1244552

ABSTRACT OF THE DISCLOSURE Methods and apparatus are disclosed for identi- fying 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 pre- viously obtained from an eye, the pupil of which was sim- ilarly brought to the same predetermined size. The illu- mination of the iris may include oblique illumination from several positions around the circumference of the iris. The illumination from each position may be rela- tively monochromatic, so that the resulting shadow will lack the color of the light source at that position, pro- viding better contrast for elevation-dependent 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.

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