基于方向图的指纹图像预处理算法  

Preprocessing of Fingerprint Image Based on Orientation Map

作　　者：陈立潮[1] 王宇[1] 刘佳[1] 张伟[1] 张力[2] 

机构地区：[1]太原科技大学计算机科学与技术学院,山西太原030024 [2]中国船舶重工集团公司第七二二研究所,湖北武汉430079

出　　处：《计算机技术与发展》2007年第9期85-87,91,共4页Computer Technology and Development

基　　金：山西省自然科学基金资助项目(200501044)

摘　　要：指纹图像具有方向性强的特点。为了很好地保持和恢复指纹的纹线结构,提高指纹图像预处理算法的抗噪能力,提出了一套基于方向图的指纹图像预处理算法,对传统的方向图计算方法进行了改进,加入了噪声检测功能,得到了更为精确的点方向图,并利用指纹图像的方向信息进行分割、滤波去噪、二值化,最后细化得到了效果比较理想的指纹点线图。实验证明,文中所述的预处理算法能够有效地保持和恢复指纹图像的纹线结构,对各种噪声干扰具有较强的鲁棒性。The fingerprint image has a characteristic of obvious orientation. To keep this characteristic steady and strengthen the robustness of fingerprint - preprocessing, a combinational algorithm based on orientation is proposed for fingerprint - preprocessing. In this paper, an improved method for the computation of fingerprint orientation map is suggested, which has an ability of noise detection. This preprocessing algorithm is composed of directional image computation, image segmentation, filtering, binarization and thinning. The experiment results show that, this algorithm is more robust to noise.

关 键 词：指纹 预处理 方向图 图像分割 二值化 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]