access icon openaccess Application of unconstrained BCG extraction in VDT visual fatigue monitoring

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 15/10/2018, Accepted 09/01/2019, Published 25/03/2019

Eye diseases caused by long times of use of visual display terminal (VDT) products is considered as a serious problem in recent years. The eye fatigue monitoring is significant for early warning. Here, an unconstrained measuring method is used to extract Ballistocardiogram (BCG) by acceleration sensor. The acceleration signals are acquired by installing the sensor on seat back. Adaptive threshold wavelet transform is processed for denosing non-linear noise interference such as power line interference, baseline drift, random movement of human body, and ground vibration. Frequency domain filtering and IFFT are applied to extract BCG from acceleration sensor. RR interval of ECG and JJ interval of BCG in time domain have the similar cycle, and the correlation coefficient is up to 0.9918, which prove the feasibility to extract BCG from vibration signals using unconstrained method.

Inspec keywords: diseases; feature extraction; fast Fourier transforms; computer displays; frequency-domain analysis; time-domain analysis; medical signal processing; wavelet transforms; signal denoising; electrocardiography; vibrational signal processing; patient monitoring

Other keywords: vibration signals; ECG; eye diseases; denosing nonlinear noise interference; IFFT; unconstrained BCG extraction; baseline drift; human body; power line interference; acceleration sensor; time domain; VDT visual fatigue monitoring; acceleration signals; ballistocardiogram; visual display terminal products; frequency domain filtering; eye fatigue monitoring; wavelet transform

Subjects: Mathematical analysis; Bioelectric signals; Signal processing and detection; Integral transforms; Computer displays; Digital signal processing; Biology and medical computing; Electrical activity in neurophysiological processes; Electrodiagnostics and other electrical measurement techniques; Integral transforms; Mathematical analysis; Function theory, analysis

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