Iris location velocity and accurate is crucial in iris identification system. A iris location algorithm using geometric symmetry feature and two intersecting chord properties is presented. Based on this idea

edge detector and gray distributing information are used to extract iris interior edges

intersecting chord properties and voting scheme is used to search iris circle center. Then iris interior and exterior radius detected by using 1D radius histogram of Hough transform. At last the experiment results of iris location algorithms is showed

and the location time and accurate are compared with other method. Simulation results show that the method can improve location speed and isn't sensitive to noise effect.