一种基于圆几何特征的虹膜定位算法

虹膜定位是虹膜识别中基础性环节，其精度和速度决定了虹膜识别系统的性能，为提高虹膜定位的速度，提出一种基于圆几何特征的虹膜内边缘定位算法，利用内外边缘中心的耦合特性缩小微积分方法搜索外边缘的范围。试验结果表明，与经典虹膜定位算法相比，本算法快速、精确、鲁棒。

An Algorithm Based on Circle Geometric Characteristic for Iris Boundaries Location

Iris location is a basal procession in an iris recognition system. The speed and accuracy of the iris location decide the performance of the iris recognition system. In order to speedup the rate of iris location, this paper introduces a fast location algorithm for pupil detecting based on the geometrical characteristics of a circle. By using the coupling relationship between the inner and outer edges of the iris image, a calculus method is used to greatly reduce the search range to locate outer boundaries. Experiments show that the algorithm is fast, accurate and robust compared with other classical methods.