Visual axis detecting device and apparatus including visual axis

Details Visual axis detecting device and apparatus including visual axis Visual axis detecting device and apparatus including visual axis

1997-09-30

2000-03-14

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351212, 351205, A61B 314

Patent

active

060363169

ABSTRACT:
A visual axis detecting device includes an image sensor for imaging an eyeball image and a visual axis detector for detecting a Purkinje image from the eyeball image imaged by the image sensor as well as for extracting pupil edges from a plurality of pupil edge candidates contained in the eyeball image and detecting the visual axis of a user using the Purkinje image and the pupil edges. The visual axis detector defines a reference point from the position of the Purkinje image, determines the distances from the reference point to the plurality of pupil edge candidates, respectively, and extracts the pupil edges from the plurality of pupil edge candidates by statistically processing the distances. With this arrangement, the visual axis detecting device can correctly extract the pupil edges at a high speed.

REFERENCES:
patent: 5657109 (1997-08-01), Konishi
patent: 5671447 (1997-09-01), Tokunaga
patent: 5719388 (1998-02-01), Tokunaga

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