Eye-gaze tracking with one camera
单摄像机视线跟踪

An eye-gaze tracking method,which can make this system be automatically adapted to external lighting changes and the user's head movements freely,was put forward to alleviate the restriction on the user's head movements.In this paper, we concentrated on development of the algorithms.Based on the brightness histogram of the eye image,the adaptive thresholds for pupil extraction and corneal reflection were extracted.On the basis of the brightness,gradient of the edge points of the pupil and the smoothness of the pupil boundary,the edge points could be obtained by a 1D line search.We applied a new randomized method of ellipse fitting to the edge points.A solution to cope with eyelashes,eyelids and glints in the pupil area was also discussed.Experiments show that the improved algorithm is effective.