The electrocardiogram (ECG) can serve as a useful biometrie; however, the ECG may be susceptible to morphological changes due to changes in body posture. The objective of this paper is to study the effect of body posture on a non-fiducial biometric system. ECG data were collected from 52 subjects over multiple sessions in the supine, sit, and stand postures; each posture was held for approximately 60 seconds. The postures' intervals were divided into 20 s segments with 10 s overlap which generated 417 segments. Three biometric system variants were considered to study the effect of posture: 1) single-posture system, 2) multi-posture system, and 3) posture-aware system. The single-posture system variant only compares test segments to single posture templates in the biometric database. The multi-posture system variant has templates from supine, sit, and stand postures. The posture-aware system variant uses the subject's posture and then compares incoming test segments with the templates from the matching posture. The single-posture system variant had the highest average true positive (TP) rate of 65.5% in the supine posture and the lowest average TP rate of 50.8% in the stand posture. The multi-posture system and posture-aware system variants had an average TP rate of 81.5% and 80.8%, respectively. The multi-posture system variant identified the posture of the test segments with an average rate of 71.0% Results indicated that posture affects the ECG measurement; therefore, ECG biometric systems should take this into consideration in their design and implementation.

biometrics, electrocardiogram, posture, signal quality index, wavelet distance
2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018
Department of Systems and Computer Engineering

Abdelazez, M. (Mohamed), Sreeraman, S. (Shreyas), Rajan, S. (Sreeraman), & Chan, A. (2018). Effect of body posture on non-fiducial electrocardiogram based biometrie system. In I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings (pp. 1–5). doi:10.1109/I2MTC.2018.8409850