人体自由运动状态下的视线追踪算法研究

Research on eye gaze tracking system in free movement

针对人体在大空间范围内自由运动时视线方向难以追踪的问题,构建了一套基于光学跟踪设备的头戴式视线追踪系统。系统通过被动式光学追踪设备和头戴式眼部摄像机获取使用者的头部运动状态与眼部图像,然后依据初始标定结果来估计使用者自由运动状态下的视线方向;最后对系统进行简化,得到了适用于同类环境、与具体硬件设备无关的视线跟踪三点三面三变换几何模型。对系统进行应用实验和误差分析表明,使用者在3.0 m×3.2 m×2.0 m的大工作空间内自由运动时视线追踪误差为1.69°,频率为20 Hz。

Aiming at the problem that the gaze direction was difficult to track when the human body moved in a large space,this paper built a head-mounted eye gaze tracking system based on the optical tracking device. With the help of the passive optical real-time tracking device to track the user＇s head position,it used the head mounted eye camera to obtain the eye image,then compared the user＇s real-time head and pupil state with the initial states to estimate the gaze direction under the free movement. In the end,it obtained a simplified eye gaze tracking geometric model named three points three planes three conversions,which was applicable to similar environment and independent of specific hardware devices. The application experiments and error analysis of the system shows that the error of gaze direction estimation is within 1. 69 degrees and the frequency is 20 Hz when users move freely in 3. 0 m × 3. 2 m × 2. 0 m space.