Visibility range measuring apparatus for motor vehicle

Details Visibility range measuring apparatus for motor vehicle Visibility range measuring apparatus for motor vehicle

1998-11-06

2000-10-03

Font, Frank G.

Optics: measuring and testing

By configuration comparison

With projection on viewing screen

356 3, G01B 908, G01C 300

Patent

active

061280887

ABSTRACT:
A visibility range measuring apparatus for detecting visibility range in a passive fashion without suffering erroneous operation even in the case of such a situation that a plurality of visibility range measuring apparatuses exist within a coverage thereof. The apparatus includes a camera mounted on a motor vehicle for taking a picture of parts of a lane-dividing mark lines extending forwardly in front of a motor vehicle and a visibility-range determining control unit for determining the visibility range through comparison of luminances at a plurality of locations of the lane-dividing mark line, which locations differ from one another with respect to the location of the motor vehicle.

REFERENCES:
patent: 5307136 (1994-04-01), Saneyoshi
patent: 5351044 (1994-09-01), Mathur et al.
patent: 5739848 (1998-04-01), Shimoura et al.

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