REAL TIME EYE TRACKING FOR HUMAN COMPUTER INTERACTION

摘要

A gaze direction determining system and method is provided. A two-camera system may detect the face from a fixed, wide-angle camera, estimates a rough location for the eye region using an eye detector based on topographic features, and directs another active pan-tilt-zoom camera to focus in on this eye region. A eye gaze estimation approach employs point-of-regard (PoG) tracking on a large viewing screen. To allow for greater head pose freedom, a calibration approach is provided to find the 3D eyeball location, eyeball radius, and fovea position. Both the iris center and iris contour points are mapped to the eyeball sphere (creating a 3D iris disk) to get the optical axis; then the fovea rotated accordingly and the final, visual axis gaze direction computed.

主权项

1. A method for estimating an eye gaze direction as a vector from a fovea of an eye, through a center of an iris, to an object upon which gaze is directed, based on a facial image, comprising:
receiving facial image by at least one processor, and based on at least the facial image, an anatomical model of the eye, and an adaptive computational model stored in a memory:
estimating the center of the iris;estimating a three dimensional center and size of the eye to thereby define an optical axis through the center of the iris and the three dimensional center of the eye;estimating a position of the fovea of the eye, displaced from the optical axis of the eye;estimating an eye gaze direction along the vector; and receiving calibration information representing an error between the estimated eye gaze direction and a gaze target; updating the adaptive model to reduce the error; and outputting information selectively dependent on the estimated eye gaze direction.