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利用自动眼球追踪技术开发辅助残障人士的人机界面系统。来自眼睛跟踪系统的数字信号被传送到计算机，该数字信号由被摄体的眼睛向水平和垂直方向移动的运动和距离组成。然后，处理该信号，以便将对象的眼睛的移动叠加为计算机显示器上的光标的移动。开发一个处理信号的软件花了很长时间，因为我们几乎没有参考文献。我们已经成功地实现了在显示器上控制光标的运动，使其与受试者眼睛的运动同步。然而，我们并没有通过使用受试者眼睛有意识地连续眨眼来产生光标的点击。我们已经通过实验认识到校准的重要性和改变受试者头部的效果。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，以便将眼睛移动的程度与监视器上光标移动的区域相适应。由于被摄体的头部移动会导致光标位置的移动，因此光标可以移动的区域将偏离监视器上的标准位置。因此，整个系统受到主体的头部转移的强烈影响。

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.