An off-line signature verification system using an extracted displacement function
An off-line signature verification system using an extracted displacement function
复制标题
使用提取位移函数的离线签名验证系统
DOI：
10.1109/icdar.1999.791898
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
I. Yoshimura
中科院分区：
文献类型：
--
作者：
Y. Mizukami;H. Miike;M. Yoshimura;I. Yoshimura
本文提出了一种基于位移提取方法的离线签名验证系统，在该系统中，可疑签名与相应的真实签名进行比较。使用定义为两个签名之间的欧几里得距离的平方的加权和的泛函的最小化和要求位移函数的平滑度的惩罚项来提取用于任何签名对的最佳位移函数。应用由粗到细的搜索方法以避免在局部最小值处停止，即，首先通过高斯滤波将这两个签名变换成粗图像。最佳位移函数被合并，使得系统测量可疑签名和对应的真实签名之间的相异性。只有当观察到的相异度低于使用两个真实签名之间的相异度乘以阈值系数确定的阈值时，可疑签名才被接受为真实的。进行了实验，以评估所提出的系统的有效性，与所得到的错误率低至24.9%，一个水平远远优于通过一种方法，利用没有位移功能。
This paper proposes an off-line signature verification system based on a displacement extraction method in which a questionable signature is compared with a corresponding authentic one. The optimum displacement function for any pair of signatures is extracted using minimization of a functional defined as the weighted sum of the squared Euclidean distance between two signatures and a penalty term requiring smoothness of the displacement function. A coarse-to-fine search method is applied to avoid stopping at a local minimum, i.e., the two signatures are first transformed into coarse images by Gaussian filtering. The optimum displacement function is incorporated such that the system measures the dissimilarity between a questionable signature and the corresponding authentic one. The questionable signature is accepted as genuine only if the observed dissimilarity is below a threshold determined using the dissimilarity between two authentic signatures multiplied by a threshold coefficient. An experiment was performed to evaluate the effectiveness of the proposed system, with resultant error rates being as low as 24.9%; a level much better than that obtained by a method utilizing no displacement function.