ABSTRACT
Infrared light is commonly used in the eye tracker because it eliminates the influence of ambient illumination and improves discrepancy between the pupil and the white of the eye. This chapter introduces three versions of the single-chip eye tracker with the smart complementary metal-oxide-semiconductor (CMOS) image sensor pixels. Eye movements can generally be grouped into six types: saccades, smooth pursuit, vergence, optokinetic reflex, vestibule-ocular reflex, and fixation. There exist four main methods for measuring eye movements in relation to head movements: electro-oculography (EOG), scleral contact lens/search coil, photo-oculography (POG) or video-oculography (VOG), and video-based combined pupil and corneal reflection. The chapter proposes a version of the single-chip eye tracker that eliminates the glint effect and generates the digital address for the center of the pupil. It proposes an eye tracking algorithm and architecture that can eliminate the effect of glints and describes circuit implementation.
