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Modelling and Simulation in Engineering
Volume 2015, Article ID 612843, 7 pages
http://dx.doi.org/10.1155/2015/612843
Research Article

A Segmental Approach with SWT Technique for Denoising the EOG Signal

Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM University, Kattankulathur, Kancheepuram, Tamil Nadu 603203, India

Received 26 September 2015; Revised 23 October 2015; Accepted 25 October 2015

Academic Editor: Aiguo Song

Copyright © 2015 Naga Rajesh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Electrooculogram (EOG) signal is often contaminated with artifacts and power-line while recording. It is very much essential to denoise the EOG signal for quality diagnosis. The present study deals with denoising of noisy EOG signals using Stationary Wavelet Transformation (SWT) technique by two different approaches, namely, increasing segments of the EOG signal and different equal segments of the EOG signal. For performing the segmental denoising analysis, an EOG signal is simulated and added with controlled noise powers of 5 dB, 10 dB, 15 dB, 20 dB, and 25 dB so as to obtain five different noisy EOG signals. The results obtained after denoising them are extremely encouraging. Root Mean Square Error (RMSE) values between reference EOG signal and EOG signals with noise powers of 5 dB, 10 dB, and 15 dB are very less when compared with 20 dB and 25 dB noise powers. The findings suggest that the SWT technique can be used to denoise the noisy EOG signal with optimum noise powers ranging from 5 dB to 15 dB. This technique might be useful in quality diagnosis of various neurological or eye disorders.