基于梯度的方向信息在指纹预处理中的应用  

Application of direction information based on gradient in fingerprint preprocessing

作　　者：马建敏[1] 李晶[2] 杨奎河[1] 王政[3] 

机构地区：[1]河北科技大学信息科学与工程学院,河北石家庄050018 [2]河北化工医药职业技术学院,河北石家庄050026 [3]石家庄法商职业学院,河北石家庄050091

出　　处：《微型机与应用》2010年第16期44-46,49,共4页Microcomputer & Its Applications

摘　　要：为了提高指纹图像预处理算法的抗噪能力,给出了一种基于梯度的指纹方向图获取方法,并利用指纹图像的方向信息进行指纹图像的预处理,得到了更为精确的指纹细节点图。在指纹预处理过程中引入该方法,能有效地改善指纹纹线的质量。实验分析表明,该方法具有很好的使用价值。In order to maintain and restore fingerprint ridge structures, and improve the noise immunity of fingerprint image preprocessing algorithm. In the paper, a method for getting direction image based on gradient is given. Using direction information of fingerprint image, we execute a sequence of operations,such as： image enhancement, binalization, thinning, and a more accurate linear graph is obtained. This method which is proposed in process of fingerprint preprocessing can effectively improve the quality of fingerprint ridge and has an obvious restrain effect for different kinds of image noise. The experiment results show that the method achieves the desired result.

关 键 词：预处理 方向图 二值化 细化 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]