摘要
采用粗定位和精定位相结合的方法进行虹膜定位.首先,利用虹膜为环形的特点,采用几何算法粗略得出虹膜外边界的圆心和半径.然后利用瞳孔区域的灰度值较小的特点对虹膜的内边界进行粗定位.最后根据粗定位的结果采用一定的算子对虹膜的内、外边界精确定位.实验结果表明,定位的精度较高,且速度较快.
Cursory combined with refined method was used to iris localization in this article. Firstly, according to iris is a kind of cirque, algorithm based on geometrical feature is used to locate outer boundary of iris curso- rily. Then according to that the gray of pupil area is very low, the inner boundary of iris is located cursorily. At the end, based on the result of cursory localization, the outer and inner boundary of iris is located refinedly by a kind of arithmetic operator. The last result indicates that the precision and the speed is higher than other iris localization methods.
出处
《西安文理学院学报（自然科学版）》
2009年第4期45-47,共3页
Journal of Xi’an University(Natural Science Edition)
关键词
虹膜定位
灰度
内边界
外边界
iris localization
gray
inner boundary
outer boundary
