统一参数形变的指纹细节点模板保护方法

A method for fingerprint template protection based on global parameter transformation

针对指纹模板形变的保护方法中存在识别精度较低的问题,提出一种基于统一参数形变的指纹细节点模板形变方法.该方法采用统一变换参数进行细节点位置的特征变换,减小变换误差.而细节点方向角的变换,采用Lee的方法,从细节点邻域方向图中提取变换参数,保证变换的不可逆性.实验结果表明,本方法的综合性能(识别性能与模板保护性能)优于Lee的方法.

As for poor recognition performance of the fingerprint security templates transformation method, we propose a new fingerprint minutiae transformation method employing unified transformation parameters. In this method, the position transformation parameters of all minutiae are set as the same to greatly reduce the position error in transformed minutiae, while the orientation transformation parameters is still extracted from each minutiae neighborhood as the method proposed by Lee to ensure the Jrreversibility of transformation, that is the biometrie template security. Experimental results show that the performance of this method （ recognition performance and template protection performance） is better than Lee＇ s method.