一种基于智能卡的指纹认证方案

利用智能卡安全的计算和存储能力,在智能卡上不仅存放指纹特征模板,而且还实现两个特征集合的比对,指纹识别算法的其它过程则由经过认证的读写设备来完成.指纹的预处理仅包括三个部分:基于8个离散方向的方向场计算,在脊线方向使用平滑算子而在垂直于脊线的方向使用增强算子的图像增强和直接对脊线进行跟踪的特征提取算法.比对过程中首先根据两个集合中的全等三角形求出它们的旋转和平移参数,然后对根据参数进行转换后的特征集合进行点模式匹配.根据实验获得的卡上比对时间和识别率表明该方法的合理性,可用于工程实践.

Solution on fingerprint verification based on smart cards

The abilities of computation and storage for smart card were utilized, the fingerprint template was not only stored in it, but also the fingerprint matching process was implemented on it, but other processes of fingerprint recognition algorithm were performed on an authenticated reader/writer. The pre-process only comprised three parts, the first was a computation of directional field based on discrete directions, then a smoothing operator and enhancing operator were used for the image enhancing along and perpendicular to the ridge of fingerprint, the last was a direct ridge tracking for feature extraction. In the matching process the parameters of rotation and displacement were obtained by two congruent triangles, then the point-pairs matching would be performed on the transformed sets. The matching time and recognition rate on smart card experimentally proved the feasibility for engineering application.