Digital image's iris locating method for user identification and authentication application, involves detecting zones between iris and cornea on sides of pupil, and determining centre and ray of circle passing by positions from transitions

摘要

#CMT# #/CMT# The method involves locating a pupil (P) in an image of eye. Positions of jumps in intensity of pixels are detected, where the pixels are located on a pupil centre (Cp) and a position (x) on a line traversing the pupil. Transition zones between iris (IR) and cornea (CR) on both sides of the pupil are detected. Centre and ray of a circle passing by the detected positions from right and left transitions (TCI, TIC), between the iris and the cornea, are determined. The positions are detected by calculating energy of high frequency components of Fourier spectrum obtained by fast Fourier transform. #CMT# : #/CMT# An independent claim is also included for a device for locating a human iris in an image of an eye. #CMT#USE : #/CMT# Method for locating an iris in a digital image of a human eye for a user identification and authentication application. #CMT#ADVANTAGE : #/CMT# The method improves the localization of the iris in the digital image of the human eye for user identification and authentication application to provide identification algorithms less sensitive to the quality of the images. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an image illustrating an iris contour localizing method. Cp : Pupil centre CR : Cornea IR : Iris P : Pupil TCI, TIC : Right and left transitions x : Position.