两种菱形结构指纹图像方向滤波器组的设计  

Two Novel Directional Filter Banks with Diamond Structure for Fingerprint Enhancement

作　　者：蔡秀梅[1] 范九伦[2] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071 [2]西安邮电学院通信与信息工程学院,西安710121

出　　处：《计算机研究与发展》2012年第5期1142-1148,共7页Journal of Computer Research and Development

基　　金：国家自然科学基金项目(61100165);陕西省教育厅专项科研计划基金项目(11JK0911);西安邮电学院中青年科研基金重点项目(ZL2009-2)

摘　　要：指纹增强对于提高指纹细节特征提取的准确率甚至整个自动指纹识别系统的性能都具有重要意义,指纹图像方向滤波器是进行指纹图像增强的一种常用方式.基于著名的斐波那契数列,设计了两组新的菱形结构的方向滤波器模板,在保证各个方向滤波器模板结构一致性的同时,既解决了模板旋转溢出的问题,又使参数在对应方向上分布更具规律性.在FVC数据库中部分典型低质量指纹图像样本上的测试表明,新设计的两组方向滤波器模板对低质量指纹图像具有明显的增强效果.与已有的方向滤波器模板相比,设计的方向滤波器模板能更好地连接断裂脊线并分离粘连脊线,而且增强过程中产生的伪特征点更少.Fingerprint enhancement is important for improving the accuracy of the minutiae extraction, even for the total automated fingerprint identification system （AFIS）. Directional filter bank （DFB） is frequently used to enhance fingerprint images. Based on the famous Fibonacci sequences, two novel DFBs with diamond structure are proposed. The especial structure can ensure the consistency of all the filter orientations＇ structure. The two DFBs not only solve the overflow problem of filter orientations, but also ensure that the coefficients on the rotated masks distribute more regularly. The performance of the two DFBs is evaluated with some typical low quality images of FVC database. Experimental results indicate that the proposed DFBs have dramatic effect on low quality fingerprint images. Compared with the DFB reported in the literature the proposed DFBs can reduce the noise, connect the broken fingerprint and enhance the ridges more efficiently. They can cause less pseudo minutiae in the course of enhancement.

关 键 词：指纹 增强 滤波模板 方向滤波器组 斐波那契数列 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]