A gaze tracking system based on single camera and four IR light sources is proposed in this paper .With pupil′s center and four reflection centers on corneal generated from the IR light sources ,a novel pupil-corneal reflection vector is construct-ed ,which is invariant to head movements .In addition ,the region of interest is applied to improve the speed of eye location ;template matching and convex hull are used to locate pupil′s center;point matching is used to identify the reflection centers .These methods guarantee the real-time performance and accuracy of the gaze tracking .The experiment results demonstrate the improved accuracy and the real-time performance of the system with less constraint on head movements .%本文提出一种基于单目摄像头和四红外光源的视线跟踪系统。通过四个红外光源在眼睛角膜上产生的四个光斑的中心与瞳孔中心建立新型的瞳孔角膜反射向量，该向量对头部运动具有较好的鲁棒性；此外通过设定感兴趣区域提高人眼定位速度，利用模板匹配与凸包方法精确定位瞳孔中心，并采用点匹配法正确识别光斑中心，确保了视线跟踪的实时性和精度。实验结果证明该系统较好地解决了视线跟踪精度不高和头部运动受限的问题，并且满足实时性要求。
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