Abstract: An embodiment of the present invention provide a system for measuring and modifying at least one model parameter of an object of an image in order to distinguish the object from noise in the image includes a perceived image generator, an image-match function, and a parameter adjustment function. The perceived image generator produces a first perceived image of the object based on the at least one model parameter. The image-match function compares the first perceived image with a real image of the object. The parameter adjustment function adjusts the at least one model parameter so that the perceived image generator produces a second perceived image of the object that more closely matches the real image than the first perceived image.

Abstract: An embodiment of the present invention is a system for identifying a user by observing irregularities on the surface of an eyeball of the user includes a topography system and a gaze tracking system. The topography system obtains one or more discernable features of the eyeball and stores the one or more discernable features. The gaze tracking system observes the irregularities, compares the irregularities to the one or more discernable features, and identifies the user if the irregularities and the one or more discernable features match.

Abstract: In an embodiment of the invention, a stereoscopic image of an object is obtained using two cameras. The locations and orientations of the two cameras are obtained. The stereoscopic image of the object is displayed on a stereoscopic display. A first gaze line from a right eye and a second gaze line from a left eye of an observer viewing the object on the stereoscopic display are measured. A location of the object in the stereoscopic image is calculated from an intersection of the first gaze line and the second gaze line. The three-dimensional location of an object is calculated from the locations and orientations of the two cameras and the location of the object in the stereoscopic image.