视线追踪系统头动状态下的视线落点补偿方法

Gaze Point Compensation Method under Head Movement in Gaze Tracking System

头部位置变化的视线估计问题是视线追踪技术中的难点。基于单摄像机无光源视线追踪系统,提出了一种在平移头动的视点估计补偿方法,包括头部深度平移和头部平面平移的补偿方法。首先分析了平移头对视线落点产生偏差的原因,提出利用深度系数和平面移动比例系数对视线落点进行补偿,然后根据投影变换约束计算虹膜中心的空间三维坐标,接下来根据虹膜中心的移动距离对屏幕上的视线落点进一步补偿,得到最终的视线落点。试验证明了本文方法对平移头动下的视线落点补偿具有显著效果。

The challenge of the gaze Based on a gaze tracking system of tracking technology is the gaze estimation under natural head movement. single camera and natural light source, we proposed a compensation method of the gaze estimation under the head translational movement, including head depth translation and head plane translation. First, we analyzed the reason of the gaze point deviation of head translational movement, and proposed to use the method of depth coefficient and proportion coefficient of translational movement to compensate the gaze point coordinates. Then, through projection transformation constraint and coordinate conversion, the 3D coordinate of center of iris is calculated. In the following step, according to the displacement distance of center of iris, the gaze point on screen is compensated further, and final gaze point coordinate is obtained. Experimental results show that the method is very effective to gaze point compensation under head translational movement. The experiment result shows that the effectiveness of the proposed method.