In order to improve the performance of iris recognition,a novel iris recognition method is presented.Firstly the algorithm locates the inner-circle and outer-circle of iris,then it expands and denoises the iris.Secondly it filters the iris image and encodes iris feature.In the matching method,the distance of two features is defined by Hamming distance.Experimental results show that this algorithm is effective for iris images and it shortens the processing time and code-size of iris feature by a large margin...