基于几何特征的虹膜定位算法  

An iris localization algorithm based on geometrical characteristics

作　　者：韩丽娜[1] 

机构地区：[1]中北大学信息与通信工程学院电子测试技术国家重点实验室,山西太原030051

出　　处：《传感器世界》2013年第9期11-13,共3页Sensor World

摘　　要：利用虹膜边缘的几何特征及圆相交弦的性质提出了虹膜定位算法。根据瞳孔、虹膜、巩膜的灰度变化,建立虹膜图像直方图,确定阈值进行虹膜内边缘定位;再用形态学算法与新的Hough变换相结合来进行虹膜图像外边缘的定位,确定外圆圆心及半径。通过仿真结果表明本方法实时性能较好,能较好地实现内外边缘的定位。The velocity and accuracy of iris localization are crucial in iris identification system. According to the gray levels of the pupil, iris, and sclera, iris image histograms are established and the threshold values are determined to realize the positioning of the inside edges. With the morphology algorithm in combination of new Hough transform, the outside edges of the iris images are located, and the centers and radii of outer circles are determined. The simulation results show that the present method has good effect on real-time performance and positioning realization of inside and outside the edges.

关 键 词：虹膜识别 几何特征 内边缘定位 外边缘定 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]