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:
Apr. 15, 1997
Filed:
Sep. 08, 1995
Takuo Ishiwaka, Zushi, JP;
Hirosi Saitou, Yokohama, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
A sighting direction detecting device including a TV camera which is disposed to face a human being and picks up an image of light invisible to human beings, a first illuminator which is disposed in a coaxial system with the TV camera and illuminates a human's eye-ball portion with light which is invisible to human beings, a second illuminator which is disposed at a different place from the first illuminator and illuminates the human's eye-ball portion with light which is invisible to human beings, a first calculator for calculating an equation of a line passing the pupil center position of the eye-ball, an equation of a line passing the reflected-light position of the first illuminator and an equation of a line passing the reflected-light position of the second illuminator on the basis of the image which is picked up by the camera, a second calculator for calculating the center position of a cornea ball on the basis of the equation of the line passing the reflected-light position of the first illuminator and the equation of the line passing the reflected-light position of the second illuminator which are calculated by the first calculator, and a third calculator for calculating the sighting direction of the human being on the basis of the equation of the line passing the pupil center position detected by the first calculator and the center position of the cornea ball which is calculated by the second calculator, wherein the image obtained by the TV camera comprises a first image obtained under illumination of the first illuminator and the second illuminator and a second image obtained under illumination of illumination means which does not contain the first illuminator.