Arm swing identification method with template update for long term stability

Authors:
Kenji Matsuo;Fuminori Okumura;Masayuki Hashimoto;Shigeyuki Sakazawa;Yoshinori Hatori
Affiliations:
KDDI R&D Laboratories Inc., Saitama, Japan;Tokyo Institute of Technology, Yokohama-shi, Japan;KDDI R&D Laboratories Inc., Saitama, Japan;KDDI R&D Laboratories Inc., Saitama, Japan;Tokyo Institute of Technology, Yokohama-shi, Japan
Venue:
ICB'07 Proceedings of the 2007 international conference on Advances in Biometrics
Year:
2007

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Abstract

This paper proposes a novel method for biometric identification, based on arm swing motions with a template update in order to improve long term stability. In our previous work, we studied arm swing identification and proposed a basic method to realize a personal identification function on mobile terminals. The method compares the acceleration signals of arm swing motion as individual characteristics, with the tolerant similarity measurement between two arm swing motions via DP-matching, which enables users to unlock a mobile terminal simply by swinging it. However, the method has a problem with long term stability. In other words, the arm swing motions of identical individuals tend to fluctuate among every trial. Furthermore, the difference between the enrolled and trial motions increases over time. Therefore in this paper, we propose an update approach to the enrollment template for DPmatching to solve this problem. We employ an efficient adaptive update method using a minimum route determination algorithm in DP-matching. Identification experiments involving 12 persons over 6 weeks confirm the proposed method achieves a superior equal error rate of 4.0% than the conventional method, which has an equal error rate of 14.7%.