Research on Non-invasive Eye Tracking Using Corneal Reflex

As the existed eye tracking devices are so complex that the restrictions on the position are too many and people have to wear special equipment, this paper introduces a novel method against eye tracking: using the five near-infrared light as the source of corneal reflex. With the help of our method, people won’t need any equipment against eye tracking. Our method is able to adapt to the natural head movement and calculate the position of sight more accurately. In order to improve the mapping accuracy, a new method for pupil edge fitting is proposed to fit circularly and remove false points. In our paper the grayscale of images is used to initialize eye position quickly and accurately. Besides, we introduce the theory of cross-ratio invariance to make coordinate mapping and calculate the attention coordinate accurately.