On Eye Gaze Determination via Iris Contour

We present a new approach for measuring the eye gaze using images that contains only one eye of a person. The model of the eye is investigated and gaze can be estimated by tracking the eyeball rotations. Iris contour is modeled as one planar circle and we estimate the ellipses of their projections onto a retinal plane. The unique solution of the orientations was obtained based on a geometric constraint, namely that the distance between the eyeball's center and the two eye comers should be equal to each other. The robustness of this approach was verified by experiments on synthetic and real image data. In order to obtain a higher resolution of the iris, a zoom-in camera is used. A general approach that combines head pose determination with gaze estimation is proposed. guiding the gaze camera using the head pose information obtained by pose camera. We disambiguate the normals solution based on the prior knowledge of the eye model, namely that the distances between eyeball center and two eye comers should be equal to each other, we call it "distance constraint". The eyeball center can be calculated from the resulting iris center and the normal of the iris plane. Then the eyeball center is transferred to the pose camera coordinate system and the unique solution can be obtained by comparing the distance between the distance from the eyeball center to the two comers under the pose camera coordinate system. Different from existing eye models (e.g. [ lo , 9] ) , the iris contour is modeled as one circle and its projection is so fitted as ellipse rather than circle. So our approach is more realism than the existing approaches.