Flash-based gaze tracking using directional light sources

Various implementations determine a gaze direction based on a corneal center and (a) a pupil center or (b) an eyeball center. The corneal center is determined using a directional light source to generate one or more flashes that are reflected from the eye surface and captured by a sensor. The angle (e.g., direction) of light from a directional light source can be known, for example, using an encoder that records the orientation of the light source. The known direction of the light source helps to determine the distance of the flash on the cornea and enables the determination of the corneal position, for example, based on a single flash. The corneal center may be determined (e.g., using an average corneal radius or a previously measured corneal radius or using information from a second flash). The direction of gaze may be determined using the corneal center and pupil center or eyeball center. 各种具体实施基于角膜中心和(a)瞳孔中心或(b)眼球中心来确定注视方向。使用定向光源以产生从眼睛表面反射并由传感器捕获的一个或多个闪光来确定角膜中心。例如使用记录光源取向的编码器可以知道来自定向光源的光的角度(例如，方向)。光源的已知方向