Patent ID: 7306337

Claim:
A method for tracking eye gaze, comprising the steps of: focusing a single camera on an eye of subject viewing a gaze point on a screen while directing light toward the eye; sampling eye gaze data pertaining to a glint and pupil image of the eye in an image plane of the single camera; determining eye gaze parameters from the eye gaze data, wherein the eye gaze parameters include: Δx, Δy, r, θ, g x , and g y , wherein Δx and Δy are orthogonal projections of a pupil-glint displacement vector directed from the center of the pupil image to the center of the glint in the image plane, wherein r is a ratio of a major semi-axis dimension to a minor semi-axis dimension of an ellipse that is fitted to the pupil image in the image plane, wherein θ is an angular orientation of the major semi-axis dimension in the image plane, and wherein g x , and g y are mutually orthogonal coordinates of the center of the glint in the image plane; and estimating the gaze point from the eye gaze parameters.