Iris Boundary Localization Method Based on Polar Coordinate
Qichuan Tian, Lanfang Zhang, Xiaojia Wu · Procedia Engineering · 2012
Iris boundary looks like a circle in shape and the formula of circle is very simple in polar coordinates, so an iris boundary localization method based on polar coordinate is proposed in this paper. The main steps include extracting binary edge based on canny operator, transforming binary edge image into polar coordinate image, selecting edge points and estimating boundary parameters in polar coordinates. Interferences that caused by light spots, eyelids, eyelashes and iris textures can be eliminated in edge extraction effectively, and iris boundary localization accuracy can be improved after iris boundary point selection. Simulation results show that the proposed method is effective.