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The System I4Control® - Hands-Free Interaction with a Computer

Marcela Fejtová
Faculty of Electrical Engineering, Czech technical university in Prague

Vratislav Fabián
Medicton group Ltd., Prague

Martin Dobiáš
Faculty of Electrical Engineering, Czech technical university in Prague


The system I4Control® represents a novel type of computer periphery (an assistive technology), which enables handicapped people with various disabilities to control of a personal computer through movement of eyes or head. Since it emulates computer mouse, it provides its user by a unique chance to communicate with all installed SW applications by means of his/her eye movements. The system is based on the video-oculographic method of recording eye movements with a tiny camera, which catches up to the frame of spectacles. It is a simple, non-invasive and accurate method for monitoring eye movement. This solution does not require fixing the head.

There are several alternatives for the control of the computer cursor. However, neither of them enables direct gaze control, i.e. placing of the computer cursor at the observed spot on the computer screen. The basic control option is direct continuous control of the computer cursor in an incremental mode. In this mode, the user controls continuous movement of the cursor by deviating from the idle position. The actual eye position therefore has no direct effect on the position of the cursor on the computer screen; instead, it determined the direction and duration of the cursor motion (similar to the joystick). The system can control both a single and double clicks. Both functions are activated by an eye blink with a specified duration, filtering out natural blinking of the eye. Users can modify numerous settings prior to each launch of the I4Control® application. Another alternative of computer cursor control is a discrete control in an incremental mode. In this case, the cursor movement is controlled in the same manner as in the previous alternative, only the cursor moves on the screen differently. In the first case the cursor moves continuously, while in this mode, the cursor performs discrete jumps.

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