Method of identifying iris

Abstract

A method of identifying iris includes: providing incident beams entering an eye locating at a reference position; setting a first, a second and a third reference point for locating the eye at the reference position; forming a first, a second and a third measuring glint by the incident beams after the eye moves from the reference position to a measuring position, and positions of the first, the second and the third measuring glint corresponding to the positions of the first, the second and the third reference point; capturing an eye image including a first, a second, a third measuring glint image and an iris image; comparing the gray scale value with a threshold gray scale value to obtain the positions of the first, the second and the third measuring glint; and calculating a first and a second variation to obtain an resolution variation of the iris image.

What is claimed is: 
     
         1 . A method of identifying iris comprising:
 providing, by an optical assembly, a plurality of different incident beams entering an eye, the eye locating at a reference position, wherein the optical assembly includes only one single light source and only one light dispersing component, and the only single light source is configured to generate light entering into the only one light dispersing component so that the light is divided into the plurality of incident beams entering the eye by the light dispersing component;   setting a first reference point, a second reference point and a third reference point as a mark for locating the eye at the reference position, wherein positions of the first reference point, the second reference point and the third reference point are corresponding to emission positions of the incident beams;   forming a first measuring glint, a second measuring glint, and a third measuring glint near a pupil of the eye by the incident beams after the eye moves from the reference position to a measuring position, and a plurality of positions of the first measuring glint, the second measuring glint, and the third measuring glint are corresponding to the positions of the first reference point, the second reference point and the third reference point;   capturing an eye image of the eye including a first measuring glint image, a second measuring glint image, a third measuring glint image, and an iris image;   analyzing a gray scale value of the eye image by comparing the gray scale value with a threshold gray scale value through an arithmetic unit to obtain the positions of the first measuring glint, the second measuring glint, and the third measuring glint; and   calculating a first variation of a first line defined by the first measuring glint and the second measuring glint with respect to a first reference line defined by the first reference point and the second reference point, and calculating a second variation of a second line defined by the second measuring glint and the third measuring glint with respect to a second reference line defined by the second reference point and the third reference point, so as to obtain an resolution variation of the iris image when the eye is located at the measuring position.   
     
     
         2 . The method of identifying iris according to  claim 1 , wherein the reference position is corresponding to a position where the eye gazes straight ahead. 
     
     
         3 . The method of identifying iris according to  claim 1 , wherein the incident beams are infrared lights. 
     
     
         4 . The method of identifying iris according to  claim 1 , wherein the eye image is captured by an image sensor. 
     
     
         5 . The method of identifying iris according to  claim 1 , wherein the dispersing component has a plurality of optical microstructures to divide the light into the incident beams. 
     
     
         6 . The method of identifying iris according to  claim 1 , further comprising:
 calculating a deformation amount of the iris image at the measuring position relative to the iris image at the reference position according to the first variation.   
     
     
         7 . A method of identifying iris comprising:
 providing, by an optical assembly, a plurality of incident beams and forming a plurality of glints reflected by the incident beams;   setting a first reference point, a second reference point and a third reference point as a mark for locating the eye at a reference position;   forming a first measuring glint, a second measuring glint, and a third measuring glint near a pupil of the eye by the incident beams after the eye moves from the reference position to a measuring position;   capturing an eye image of the eye including a first measuring glint image, a second measuring glint image, a third measuring glint image, and an iris image;   analyzing a gray scale value of the eye image by comparing the gray scale value with a threshold gray scale value through an arithmetic unit to obtain the positions of the first measuring glint, the second measuring glint, and the third measuring glint;   calculating a first variation of a first line defined by the first measuring glint and the second measuring glint with respect to a first reference line defined by the first reference point and the second reference point, and calculating a second variation of a second line defined by the second measuring glint and the third measuring glint with respect to a second reference line defined by the second reference point and the third reference point; and   calculating an iris image deformation amount according to the first variation, the second variation and the third variation;   wherein the iris image deformation amount is caused by the iris image of the eye at the measuring position relative to the iris image of the eye at the reference position.