Mobile gaze tracking system for outdoor walking behavioral studies.
Mobile gaze tracking system for outdoor walking behavioral studies.
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作者：
Tomasi M;Pundlik S;Bowers AR;Peli E;Luo G
大多数注视跟踪技术估计屏幕上、场景图像上或受限空间中的注视点。在开放世界坐标中，特别是在行走的情况下，视线的跟踪很少被解决。我们使用一个头戴式眼动仪结合两个惯性测量单元（IMU），以跟踪在户外行走的视线方向相对于航向方向。头部相对于身体的运动通过头部和身体躯干上的伊穆斯之间的输出差来测量。IMU对的使用减少了环境干扰对每个传感器的影响。该系统在忙碌的城市地区进行了测试，并允许漂移补偿长时间（长达18分钟）的凝视记录。与地面实况的比较显示，在直线段行走时平均误差为3.3 °。步行中的凝视扫描的范围通常比估计误差大大约一个数量级。我们提出的方法也进行了测试与自然行走的真实的情况下，它被发现是适合于在户外环境中的注视行为的评价。
Most gaze tracking techniques estimate gaze points on screens, on scene images, or in confined spaces. Tracking of gaze in open-world coordinates, especially in walking situations, has rarely been addressed. We use a head-mounted eye tracker combined with two inertial measurement units (IMU) to track gaze orientation relative to the heading direction in outdoor walking. Head movements relative to the body are measured by the difference in output between the IMUs on the head and body trunk. The use of the IMU pair reduces the impact of environmental interference on each sensor. The system was tested in busy urban areas and allowed drift compensation for long (up to 18 min) gaze recording. Comparison with ground truth revealed an average error of 3.3° while walking straight segments. The range of gaze scanning in walking is frequently larger than the estimation error by about one order of magnitude. Our proposed method was also tested with real cases of natural walking and it was found to be suitable for the evaluation of gaze behaviors in outdoor environments.