Unveiling the biometric potential of finger-based ECG signals

Authors:
André Lourenço;Hugo Silva;Ana Fred
Affiliations:
Inst. Superior de Engenharia de Lisboa, Scientific Area of Electronics, Telecomm. and Computers, Portugal and Inst. de Telecomm., Scientific Area of Networks and Multimedia, Lisboa, Portugal and D ...;Instituto de Telecomunicações, Scientific Area of Networks and Multimedia, Lisboa, Portugal and Department of Electrical and Computer Engineering, Instituto Superior Técnico, Lisboa ...;Instituto de Telecomunicações, Scientific Area of Networks and Multimedia, Lisboa, Portugal and Department of Electrical and Computer Engineering, Instituto Superior Técnico, Lisboa ...
Venue:
Computational Intelligence and Neuroscience - Special issue on Selected Papers from the 4th International Conference on Bioinspired Systems and Cognitive Signal Processing
Year:
2011

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Abstract

The ECG signal has been shown to contain relevant information for human identification. Even though results validate the potential of these signals, data acquisition methods and apparatus explored so far compromise user acceptability, requiring the acquisition of ECG at the chest. In this paper, we propose a finger-based ECG biometric system, that uses signals collected at the fingers, through a minimally intrusive 1-lead ECG setup recurring to Ag/AgCl electrodes without gel as interface with the skin. The collected signal is significantly more noisy than the ECG acquired at the chest, motivating the application of feature extraction and signal processing techniques to the problem. Time domain ECG signal processing is performed, which comprises the usual steps of filtering, peak detection, heartbeat waveform segmentation, and amplitude normalization, plus an additional step of time normalization. Through a simple minimum distance criterion between the test patterns and the enrollment database, results have revealed this to be a promising technique for biometric applications.