Soundarajan S, Cecotti H
Annu Int Conf IEEE Eng Med Biol Soc. 2018 Jul;2018:3334-3337. doi: 10.1109/EMBC.2018.8512929.
Portable eye-trackers provide an efficient way to access the point of gaze from a user on a computer screen. Thanks to eyetracking, gaze-based virtual keyboard can be developed by taking into account constraints related to the gaze detection accuracy. In this paper, we propose a new gaze-based virtual keyboard where all the letters can be accessed directly through a single command. In addition, we propose a USB mouth switch that is directly connected through a computer mouse, with the mouse switch replacing the left click button. This approach is considered to tackle the Midas touch problem with eye-tracking for people who are severely disabled. The performance is evaluated on 10 participants by comparing the following three conditions: gaze detection with mouth switch, gaze detection with dwell time by considering the distance to the closest command, and the gaze detection within the surface of the command box. Finally, a workload using NASA-TLX test was conducted on the different conditions. The results revealed that the proposed approach with the mouth switch provides a better performance in terms of typing speed (36.6 ± 8.4 letters/minute) compared to the other conditions, and a high acceptance as an input device.
便携式眼动仪提供了一种从计算机屏幕上的用户获取注视点的有效方法。借助眼动追踪技术，考虑到与注视检测精度相关的限制，可以开发基于注视的虚拟键盘。在本文中，我们提出了一种新的基于注视的虚拟键盘，所有字母都可以通过单个命令直接访问。此外，我们还提出了一种直接通过计算机鼠标连接的USB口控开关，鼠标开关取代了左键点击按钮。这种方法被认为可以解决严重残疾人士在眼动追踪中的“点触问题”。通过比较以下三种情况，对10名参与者的性能进行了评估：使用口控开关的注视检测、通过考虑到与最近命令的距离采用停留时间的注视检测，以及在命令框表面内的注视检测。最后，在不同条件下使用NASA-TLX测试进行了工作量评估。结果表明，与其他条件相比，所提出的带口控开关的方法在打字速度方面表现更好（36.6±8.4个字母/分钟），并且作为输入设备具有很高的接受度。
