轻量化高精度三维眼动追踪系统

A lightweight and high-precision 3D eye tracking system

作为新型的视觉感知与认知研究的基础方法,三维眼动跟踪技术和系统已成为当前心理学、计算机科学、人机交互等学科的研究热点。目前三维眼动跟踪系统普遍采用多摄像机与多红外光源技术来实现,其注视精度高,但系统复杂繁重、配准过程繁琐,滑移误差无法避免。因此,难以在要求轻量化和高精度的领域获得应用,如航空航天等领域。为此,本文提出并实现了一种单相机单光源三维眼动跟踪系统,该系统使用瞳孔逆投影时序序列法向量求交来获得高精度的三维视线,通过双目三维视线获得注视深度信息,通过一种IMU滑移补偿算法实现滑移误差校正。相比多摄像机多红外光源的技术方案,本文技术的整体设备重量为后者的1/4;在保证注视精准度的情况下,设备具有更高鲁棒性。

As a new research methodology for visual perception and cognition,3D eye tracking has become a hot research topic in the fields of psychology,computer science,and human-computer interaction,etc.At present,3D eye tracking systems are generally implemented using multiple cameras and multiple sets of infrared light sources.Its fixation accuracy is high.However,the equipment is complex,frequent calibration is required,and it's difficult to solve device slip error.Therefore,it is hard to apply it in the field of aerospace that requires lightweight and high-precision equipment.In this paper,we present a single-camera single-light 3D eye tracking system.The system uses normal vector intersection from pupil reverse projection time sequence to obtain the high-precision 3D line of sight.The 3D gaze depth information is obtained based on the binocular 3D line of sight.An IMU slip compensation algorithm is implemented to correct slip error.Compared with a multi-camera and multi-infrared light system,the weight of the proposed system is only one-quarter of the latter.It has higher fixation accuracy and higher robustness.