Study on Man-Machine Interface for the Aid of Handicapped People Using Automatic Eye-Tracking Technique

本研究的目的是探讨如何利用自动眼动追踪技术来开发一个辅助残障人士的人机介面系统。首先，我们开发了一个将眼动追踪系统与计算机连接起来的介面系统。将来自眼睛跟踪系统的数字信号传送到计算机，所述数字信号由被检者朝向水平和垂直方向的眼睛运动的运动和距离组成。然后，处理该信号，以便将受试者的眼睛的运动模拟为计算机显示器上的光标的运动。我们花了很长时间来开发一个处理信号的软件，因为我们几乎没有参考资料。我们已经成功地实现了控制光标在监视器上的移动，该移动与受试者的眼睛的移动同步。然而，我们还没有开发的点击光标使用有意识的连续眨眼的眼睛的主体。我们已经认识到校准的重要性和移动的影响，通过实验的主体的头部。在实验开始时，必须进行校准，以控制来自眼睛跟踪系统的信号的增益，以便将眼睛运动的程度拟合到监视器上的光标运动的区域中。由于受试者的头部移动产生光标位置的移动，光标可以移动的区域将偏离监视器上的标准位置。因此，整个系统受到主体头部移动的强烈影响。

The purpose of this research is to investigate the development of a man-machine interface system for the aid of handicapped people by using an automatic eye-tracking technique.Firstly we have developed an interface system that connects the eye-tracking system with the computer. The digital signal from the eye-tracking system that is composed of the motion and the distance of eye movements of the subject toward the horizontal and vertical directions is transferred to the computer. Then, the signal is processed in order to superimpose the movements of the eye of the subject as the movements of the cursor on the computer display. It took long time to develop a software that handle the signal because we have scarcely no references. We have successfully achieved to control the movements of the cursor on monitor that is synchronized with the movements of the eye of the subject. However, we have not developed the click of the cursor by using the consciously successive blinks of the eye of the subjectWe have recognized the importance of the calibration and the effect of shifting the head of the subject through the experiments. At the beginning of the experiment, the calibration has to be made that controls the gain of the signal from the eye-tracking system in order to fit the extent of the eye-movements into the area of the cursor-movements on the monitor. Since the head-shift of the subject produces the shift of the position of the cursor, the area the cursor can move will deviate from the standard position on the monitor. As a result, the whole system is strongly affected by the head-shift of the subject.