Visibility range measuring apparatus for motor vehicle
First Claim
1. A visibility range measuring apparatus for a motor vehicle, comprising:
- picture pickup means mounted on said motor vehicle for taking a picture of a lane-dividing mark line on a road;
luminance detecting means for detecting luminances of said lane-dividing mark line relative to a background luminance at different locations of said lane-dividing mark line located away from said motor vehicle at different distances, respectively, on the basis of a picture signal outputted from said picture pickup means; and
visibility range determining means for determining the visibility range by comparing said luminances detected by said luminance detecting means.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
4 Claims
-
1. A visibility range measuring apparatus for a motor vehicle, comprising:
-
picture pickup means mounted on said motor vehicle for taking a picture of a lane-dividing mark line on a road; luminance detecting means for detecting luminances of said lane-dividing mark line relative to a background luminance at different locations of said lane-dividing mark line located away from said motor vehicle at different distances, respectively, on the basis of a picture signal outputted from said picture pickup means; and visibility range determining means for determining the visibility range by comparing said luminances detected by said luminance detecting means. - View Dependent Claims (2, 3, 4)
-
Specification