一种不规则虹膜的预处理方法

Preprocessing Method Based on a Kind of Irregular Iris

根据虹膜近似圆形但非圆的特点,给出了一种虹膜内边界不规则的定位方法,利用贝塞尔曲线精确定位.再根据虹膜内外边界之间的耦合关系提出一种由粗到精的方法来进行外边界快速定位.最后针对定位出的虹膜常常存在眼脸的干扰,提出了一种用改进的canny算子结合最小二乘法进行眼脸定位的方法.最终实验结果表明:该方法有较高的定位准确度,虹膜内边界定位更接近真实边界,明显改善了定位准确率及效率.

According to the characteristics of the iris which approximate a circle but is not a circle, we present an iris inner boundary irregular positioning method and use Bezier curve to locate precisely. Then based on the coupling relationship of the iris between internal and external boundary, we present a fast positioning method for outer boundary from coarse to fine. Finally, for the located iris is often with eyelid interference, we put forward an improved canny operator and least squares method to detect eyelid edge. The experimental results show that the location accuracy of this method is higher, and the iris inner edge location is much closer to the real boundary. Furthermore, the efficiency and results of the location have been improved obviously.