System Software Development

Abstract

In designing a graphical eye tracking application, the most important requirement is mapping of eye tracker coordinates to the appropriate application program’s reference frame. The eye tracker calculates the viewer’s Point Of Regard (POR) relative to the eye tracker’s screen reference frame, e.g., a 512 × 512 pixel plane, perpendicular to the optical axis. That is, for each eye, the eye tracker returns a sample coordinate pair of x- and y-coordinates of the POR at each sampling cycle (e.g., once every ~16ms for a 60Hz device). This coordinate pair must be mapped to the extents of the application program’s viewing window.