In a 3-D gaze tracking system, the system calibration is used to determine the positions of the light sources and the screen in the camera coordinate system, which plays an important role in the estimation of the 3-D gaze and the point of regard (PoR). The traditional way for the system calibration is the mirror-based method, in which a mirror is used to make the light sources and the screen can be captured by the camera through specular reflection. However, the mirror-based method is imprecise and complex. In this paper, a novel system-calibration method for the 3-D gaze tracking system is proposed. On the basis of the system camera, a calibration camera is placed on the opposite of the screen to constitute a multi-camera system. The images are captured by the two cameras to estimate the light sources and the screen of the system camera coordinate frame. Simulations and experiments were carried out to illustrate the validation of the method. This method solves the problem that the light sources and the screen are not in view of the system camera. In addition, it is easy to implement while ensuring high accuracy and providing a new method for other similar calibration systems.

中文翻译：

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一种新的视线跟踪系统多相机全局标定方法

在 3D 视线跟踪系统中，系统标定用于确定光源和屏幕在相机坐标系中的位置，这在 3D 视线和关注点的估计中起着重要作用(PoR)。传统的系统标定方式是基于镜面的方式，即使用一面镜面制作光源，并通过镜面反射被相机捕捉到屏幕。然而，基于镜像的方法不精确且复杂。在本文中，提出了一种用于 3-D 视线跟踪系统的新系统校准方法。在系统摄像头的基础上，在屏幕对面放置一个标定摄像头，构成多摄像头系统。图像由两个摄像头捕获，以估计系统摄像头坐标系的光源和屏幕。进行了模拟和实验以说明该方法的有效性。该方法解决了光源和屏幕不在系统摄像头视野范围内的问题。此外，它在保证高精度的同时易于实施，为其他类似的校准系统提供了一种新的方法。