Eye tracking method and apparatus

Details Eye tracking method and apparatus Eye tracking method and apparatus

1994-02-04

1995-04-25

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351209, 351221, A61B 314

Patent

active

054103762

ABSTRACT:
An improved eye tracking system capable of accurately measuring fast eye movements, is controlled by a microprocessor and software to rapidly track a subject's eye movements. The hardware for the electro-optical tracking system includes a quadrant detector which detects the relative direction of movement of the subject's eye. The output of the quadrant detector is processed by the microprocessor under the control of three software subsystems. The first software subsystem is the servo tracking software which controls positioning motors that rapidly move a mirror mechanism which reflects light that forms an image of the subject's eye on the quadrant detector. The second software subsystem is the pupil recognition software which recognizes that an image of a pupil is present. The third software subsystem is the blink detection software which recognizes the presence of a blink and disables the servo tracking subsystem. These three software subsystems work together to insure accurate tracking of a subject's eye movements.

REFERENCES:
patent: 3804496 (1974-04-01), Crane et al.
patent: 4789235 (1988-12-01), Borah et al.
patent: 4850691 (1989-07-01), Gardner et al.
patent: 4854329 (1989-08-01), Walruff
patent: 5090799 (1992-02-01), Makino et al.
patent: 5196872 (1993-03-01), Beesmer

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