Sighting direction detecting device for vehicle

Television – Special applications – Human body observation

Patent

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Details

348164, 348169, H04N 718

Patent

active

056214570

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.

REFERENCES:
patent: 3533683 (1970-10-01), Stark
patent: 4075657 (1978-02-01), Weinblatt
patent: 4648052 (1987-03-01), Friedman
patent: 4748502 (1988-05-01), Friedman

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