This prototype eye tracking testbed consists of an integrated system of hardware and software which analyzes video of the observer's eye to determine where in a displayed image scene he is fixating.
Observers identify a suspected target by fixating the point and pressing a button.
The geometry of the problem is used to estimate the point at which the observer's visual axis intersects the display image. From the location of the observer's pupil in world coordinates, we find the intersection point of the line representing the observer's visual axis and the plane representing the display image. This fixation point estimate is adjusted for small head movements and for measurement and modeling error using data from a calibration session. 3062, Orlando, FL, April 1997.