Effectiveness of Wavelet Denoising on Electroencephalogram Signals

 

Md. Mamun¹, Mahmoud Al-Kadi², Mohd. Marufuzzaman*²

 

¹ Institute of Visual Informatics Universiti Kebangsaan Malaysia 43600 Bangi, Selangor, Malaysia.

² Department of Electrical, Electronic and Systems Engineering Universiti Kebangsaan Malaysia 43600 Bangi, Selangor, Malaysia, *mohd.marufuzzaman@gmail.com.

 

ABSTRACT

Analyzing Electroencephalogram (EEG) signal is a challenge due to the various artifacts used by Electromyogram, eye blink and Electrooculogram. The present de-noising techniques that are based on the frequency selective filtering suffers from a substantial loss of the EEG data. Noise removal using wavelet has the characteristic of preserving signal uniqueness even if noise is going to be minimized. To remove noise from EEG signal, this research employed discrete wavelet transform. Root mean square difference has been used to find the usefulness of the noise elimination. In this research, four different discrete wavelet functions have been used to remove noise from the Electroencephalogram signal gotten from two different types of patients (healthy and epileptic) to show the effectiveness of DWT on EEG noise removal. The result shows that the WF orthogonal meyer is the best one for noise elimination from the EEG signal of epileptic subjects and the WF Daubechies 8 (db8) is the best one for noise elimination from the EEG signal on healthy subjects.

Keywords: electroencephalogram, discrete wavelet transform, denoising, root mean square.

 

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