作　　者： ; ; ; ;

机构地区： 深圳大学信息工程学院ATR国防科技重点实验室

出　　处： 《信号处理》 2011年第9期1423-1427,共5页

摘　　要： 在自动指纹识别系统中,对时间复杂度高的指纹图像预处理算法进行研究,为了有效地去除指纹图像中的噪声,提高识别速度以应用于实时系统,提出了一种基于8方向脊向滤波器的指纹预处理方案。该方案在求取点方向图时以方向逼近法为基础,引入均值滤波的思想以降低图像中噪声的影响,获取一致性更好、性能更稳定的点方向图;然后根据脊向滤波器的设计原理,优化设计了一组对应于指纹图像方向信息的8方向脊向滤波器模板;最后运用查表法,对于指纹图像中的每个像素点选取与其方向信息相应的滤波器模板进行图像增强。在FVC2004公布的指纹图像数据库DB1_B上,按照FVC2004测试标准所做的试验结果表明,本文所提方案简单快速有效,能够应用于实时的自动指纹识别系统。 In order to get rid of the noise of fingerprint image effectively and cut down the time of identify so it can be used to the real-time system more appropriate,this paper proposed a fingerprint pre-processing scheme based on 8 directional ridge-direction filter, which based on the study of the fingerprint image pre-processing algorithm which is time consuming in Automatic Fingerprint Identification System（AFIS）.This scheme based on direction approximation method while estimating the point orientation field of fingerprint, employed the mean filter algorithm which can reduce the influence of fingerprint image noise,not only made the consistency of point orientation field better but also made the performance of results more reliable.And then designed a suite of 8 directional ridge-direction filter which corresponding with the direction information of fingerprint image according to the design principles of ridge-direction filter.At last adopted the method of look-up to select ridge-direction filter corresponding with the fingerprint direction information of each pixel,to enhance fingerprint image.Experiments are done on the FVC2004 databases DB1_B with the FVC2004 performance evaluation method and the results show that our scheme is simply,quickly and efficiently that can be widely used in real-time Automatic Fingerprint Identification System（AFIS）.

关 键 词： 预处理算法 方向图 图像增强 方向脊向滤波器

领　　域： [自动化与计算机技术] [自动化与计算机技术]