Patent Document ID: 9398848
Application ID: 13003030
Patent Status: 1

Claim One:
1. A method of performing eye gaze tracking of at least one eye of a user, by determining the position of a central eye, the method comprising the steps of: in an image of said central eye, detecting, by means of one or more uncalibrated cameras, two-dimensional positions of at least three glint reflections on said central eye, normalizing the two-dimensional positions of the at least three glint reflections by a transformation to span a normalized coordinate system spanning a frame of reference, wherein the transformation is estimated only from the positions of the at least three glint reflections on said central eye in the image and at least three randomly-located two-dimensional coordinates in said normalized coordinate system, wherein the transformation is a Möbius transformation, and wherein said normalizing is done without a three-dimensional representation or geometrical encoding of either the positions of the glint reflections or the two-dimensional coordinates; detecting the position of said central eye relative to the positions of said glint reflections and, by means of the transformation, transforming this position to said normalized coordinate system, and tracking the eye gaze by tracking the movement of said central eye in said normalized coordinate system.