基于局部细节点三维映射的指纹模板生成方法

A fingerprint-template-generating method based on the 3D mapping of local minutiae

为了提高指纹模板的安全性、不可逆性等性能,本文设计了一种基于局部细节点三维映射的指纹模板生成方法.首先对指纹图像进行预处理,提取指纹的细节点特征,并采用参数自适应的环形区域对细节点进行筛选,然后将细节点投影到直线上,并对投影后的向量集合进行量化、映射和取模运算生成固定长度的二进制比特串,最后结合用户PIN码生成指纹模板.在指纹数据库FVC2002-DB1和-DB2上的实验结果表明,该方法生成的指纹模板在认证性、可撤销性和不可逆性等主要性能上相比几种典型方法更具优势.

To enhance the security and irreversibility performance of the fingerprint template, a fingerprinttemplate-generating method is proposed based on the 3D mapping of local minutiae. First, we extract fingerprint minutiae features after preprocessing the fingerprint image and select the minutiae using parameter adaptive circular areas. Second, we project the minutiae into a line. Subsequently, quantization, mapping, and modulo operation are performed on the projected vectors to generate a fixed-length binary bit string. Finally, a fingerprint template is generated by combining the user’s PIN code with a binary bit string. The experiments performed on FVC2002-DB1 and DB2 show that this template has advantages over the traditional ones in terms of recognition,revocation, non-invertibility, and performance.