Development of a Communication Support Device Controlled by Eye Movements and Voluntary Eye Blink

Junichi HORI  Koji SAKANO  Yoshiaki SAITOH  

IEICE TRANSACTIONS on Information and Systems   Vol.E89-D   No.6   pp.1790-1797
Publication Date: 2006/06/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e89-d.6.1790
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Human Communication II)
Category: Vision and Image
assistive technology,  communication device,  electro-oculogram,  eye movement,  voluntary eye blink,  

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A communication support interface controlled by eye movements and voluntary eye blink has been developed for disabled individuals with motor paralysis who cannot speak. Horizontal and vertical electro-oculograms were measured using two surface electrodes attached above and beside the dominant eye and referring to an earlobe electrode and amplified with AC-coupling in order to reduce the unnecessary drift. Four directional cursor movements --up, down, right, and left-- and one selected operation were realized by logically combining the two detected channel signals based on threshold settings specific to the individual. Letter input experiments were conducted on a virtual screen keyboard. The method's usability was enhanced by minimizing the number of electrodes and applying training to both the subject and the device. As a result, an accuracy of 90.1 3.6% and a processing speed of 7.7 1.9 letters/min. were obtained using our method.