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Sensors 2016, 16(2), 227;

Removing the Interdependency between Horizontal and Vertical Eye-Movement Components in Electrooculograms

Department of Biomedical Engineering, Hanyang University, Seoul 04763, Korea
Author to whom correspondence should be addressed.
Received: 20 December 2015 / Accepted: 5 February 2016 / Published: 14 February 2016
(This article belongs to the Special Issue Noninvasive Biomedical Sensors)
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This paper introduces a method to remove the unwanted interdependency between vertical and horizontal eye-movement components in electrooculograms (EOGs). EOGs have been widely used to estimate eye movements without a camera in a variety of human-computer interaction (HCI) applications using pairs of electrodes generally attached either above and below the eye (vertical EOG) or to the left and right of the eyes (horizontal EOG). It has been well documented that the vertical EOG component has less stability than the horizontal EOG one, making accurate estimation of the vertical location of the eyes difficult. To address this issue, an experiment was designed in which ten subjects participated. Visual inspection of the recorded EOG signals showed that the vertical EOG component is highly influenced by horizontal eye movements, whereas the horizontal EOG is rarely affected by vertical eye movements. Moreover, the results showed that this interdependency could be effectively removed by introducing an individual constant value. It is therefore expected that the proposed method can enhance the overall performance of practical EOG-based eye-tracking systems. View Full-Text
Keywords: electrooculogram (EOG); bio-signal processing; EOG calibration; eye tracking electrooculogram (EOG); bio-signal processing; EOG calibration; eye tracking

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Chang, W.-D.; Cha, H.-S.; Im, C.-H. Removing the Interdependency between Horizontal and Vertical Eye-Movement Components in Electrooculograms. Sensors 2016, 16, 227.

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