The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
Sep. 30, 1997
Hiroshi Arita, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.