Improved DTW algorithm for online signature verification based on writing forces

Authors:
Ping Fang;ZhongCheng Wu;Fei Shen;YunJian Ge;Bing Fang
Affiliations:
State Key Laboratories of Transducers Technology, Institute of Intelligent Machines, CAS, Hefei, Anhui, China;State Key Laboratories of Transducers Technology, Institute of Intelligent Machines, CAS, Hefei, Anhui, China;State Key Laboratories of Transducers Technology, Institute of Intelligent Machines, CAS, Hefei, Anhui, China;State Key Laboratories of Transducers Technology, Institute of Intelligent Machines, CAS, Hefei, Anhui, China;Department of Computer Science, Hong Kong Baptist University, Hong Kong, P.R. China
Venue:
ICIC'05 Proceedings of the 2005 international conference on Advances in Intelligent Computing - Volume Part I
Year:
2005

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Abstract

Writing forces are important dynamics of online signatures and they are harder to be imitated by forgers than signature shape. An improved DTW (Dynamic Time Warping) algorithm is put forward to verify online signatures based on writing forces. Compared to the general DTW algorithm, this one deals with the varying consistency of signature point, signing duration and the different weights of writing forces in different direction. The iterative dexperiment is introduced to decide weights for writing forces in different direction and the classification threshold. A signature database is constructed with F_Tablet and the equal error rate of 1.4% is realized with the improved algorithm.