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对于理想采集条件下得到的虹膜图像,现有的虹膜定位算法具有很好的定位效果.但在实际应用中,虹膜图像的采集容易受到诸如光照不均、睫毛、头发和眼镜等因素的干扰,从而引起定位的错误.针对这种非理想采集条件下得到的虹膜图像,提出一种基于径向对称变换的虹膜定位算法.该算法充分利用瞳孔具有的圆的径向对称特性来实现虹膜的定位.实验结果表明,本文方法能够有效避免由于光照不均等非理想采集条件带来的干扰,实现虹膜的准确定位,并且具有良好的鲁棒性和实时性.
For the iris images obtained under ideal acquisition conditions, the existing iris localization algorithm has a good localization effect, but in practical applications, iris image acquisition is easily affected by factors such as uneven illumination, eyelashes, hair and glasses, So as to cause localization errors.Aiming at the iris images obtained under such non-ideal acquisition conditions, an iris localization algorithm based on radial symmetry transformation is proposed.The iris localization is fully utilized by the radial symmetry of the circle The experimental results show that the proposed method can effectively avoid the interference caused by the non - ideal acquisition conditions, such as uneven illumination, so that the iris can be located accurately and has good robustness and real - time performance.