ABSTRACT

This chapter describes methodology for rapid, on-line identification of eye-point of regard with improved levels of preciseness and accuracy. It has always been the goal of eye position measurement technology to maximize instrumentation performance by: allowing subjects the maximum possible psychological and physical freedom; extracting a large amount of information with the highest possible accuracy; and enabling successful eye position measurement of the greatest possible subject population. Computers have become a boon to eye movement instrumentation. They can handle complicated computations and perform convoluted calibrations and mapping of what are essentially very non-linear phenomena. Most importantly, they make practical some second order accuracy improvements that would be prohibitive or impossible without them. The sensor, a television camera, views the eye of a subject through a head tracking mirror, and the video signal is processed to extract the features of interest, i.e., the pupil and the corneal reflection.