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:
Nov. 16, 1999
Filed:
Jan. 02, 1997
Akira Akashi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A visual axis detecting apparatus includes a two-dimensional image sensor having a plurality of detecting lines for receiving light from an eye, a first calculator for (i) detecting a change of luminance for neighboring pixels on the detecting lines, for (ii) calculating a number of pixels whose luminance is changed and a position of a center of gravity of the change of luminance as coordinates of an edge of a pupil of the eye from an amount of the change of luminance, for (iii) obtaining a plurality of coordinates of the edge of the pupil from the plurality of detecting lines, and for (iv) performing a correcting calculation of the plurality of coordinates of the edge of the pupil on the basis of an aspect ratio of a pixel of the image sensor, a second calculator for calculating a position of a center of the pupil from the plurality of coordinates of the edge of the pupil corrected by the first calculator, and a visual axis calculator for calculating a position of a visual axis by using the position of the center of the pupil.