Device for detecting line of sight

Details Device for detecting line of sight Device for detecting line of sight

1995-08-28

1996-10-01

Gross, Anita Pellman

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502012, 2502016, 2502017, 25055929, G01J 120

Patent

active

055612890

ABSTRACT:
In a device for detecting the line of sight of the observer, when the detection of the line of sight is identified as having failed, the detection is effected again with a variation in the output signal of the eyeball image or in the detection threshold value for detecting the feature points of the reflected image, thereby improving the precision and the rate of success of the detection of the line of sight. The variation in the image output signal is achieve by (1) a variation in the charge accumulating time, (2) a variation in the amplification characteristics of the image sensor, (3) a variation in the current of the illuminating infrared light-emitting diodes, and/or (4) a variation in the positions of the illuminating infrared light-emitting diodes.

REFERENCES:
patent: 5006700 (1991-04-01), Kosaka et al.
patent: 5182443 (1993-01-01), Suda et al.
patent: 5245371 (1993-09-01), Nagano et al.

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