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Sensors 2013, 13(5), 6272-6294; doi:10.3390/s130506272

Noise Reduction in Brainwaves by Using Both EEG Signals and Frontal Viewing Camera Images

Division of Electronics and Electrical Engineering, Dongguk University-Seoul, 26 Pil-dong 3-ga, Jung-gu, Seoul 100-715, Korea
* Author to whom correspondence should be addressed.
Received: 19 March 2013 / Revised: 26 April 2013 / Accepted: 8 May 2013 / Published: 13 May 2013
(This article belongs to the Section Chemical Sensors)
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Electroencephalogram (EEG)-based brain-computer interfaces (BCIs) have been used in various applications, including human–computer interfaces, diagnosis of brain diseases, and measurement of cognitive status. However, EEG signals can be contaminated with noise caused by user’s head movements. Therefore, we propose a new method that combines an EEG acquisition device and a frontal viewing camera to isolate and exclude the sections of EEG data containing these noises. This method is novel in the following three ways. First, we compare the accuracies of detecting head movements based on the features of EEG signals in the frequency and time domains and on the motion features of images captured by the frontal viewing camera. Second, the features of EEG signals in the frequency domain and the motion features captured by the frontal viewing camera are selected as optimal ones. The dimension reduction of the features and feature selection are performed using linear discriminant analysis. Third, the combined features are used as inputs to support vector machine (SVM), which improves the accuracy in detecting head movements. The experimental results show that the proposed method can detect head movements with an average error rate of approximately 3.22%, which is smaller than that of other methods.
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.

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Bang, J.W.; Choi, J.-S.; Park, K.R. Noise Reduction in Brainwaves by Using Both EEG Signals and Frontal Viewing Camera Images. Sensors 2013, 13, 6272-6294.

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