基于方向图的指纹图像处理算法

The Algorithm based on Direction Image for Fingerprint Image Preprocessing

一引言从指纹图像的局部放大图(图1(a))中,可以看到指纹图像具有以下特点:(1)在局部范围内,指纹纹线具有一致的方向性;(2)在局部范围内,指纹纹线的宽度基本相同;(3)在局部范围内,指纹纹线间的距离基本相同。根据这些特点。

As it as for other kinds of algorithm,for the algorithm based on direction image,three points should be considered. First,the algorithm should fit the object processed. Second,the algorithm should be optimized when several algorithms are used. Third,choose the perfect parameters. The perfect algorithm for fingerprint image get live was considered in the paper. It was optimized by improving serveral common algorithm and using perfect parameters. The algorithm had been tested in our AFIS2. 0,which had obtained good results.