Method for detecting nocturnal fog and system for...

Details Method for detecting nocturnal fog and system for... Method for detecting nocturnal fog and system for...

2006-04-18

2008-09-09

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C250S559400

Reexamination Certificate

active

07423752

ABSTRACT:
The invention concerns a system and method for detecting, at night, the presence of an element such as fog interfering with the visibility of a road scene situated in front of a vehicle, comprising the following operations: acquiring an image of the road scene, extracting, from the image of the road scene, at least one light halo produced by a lighting device of the vehicle, approximating a form of this light halo by an elliptic curve, comparing the form of this light halo with the elliptic curve obtained in order to deduce therefrom the presence or absence of an element interfering with visibility.

REFERENCES:
patent: 7170657 (2007-01-01), Higuchi
patent: 2005/0040333 (2005-02-01), Fluery et al.
patent: 1 498 721 (2005-01-01), None
patent: 0 687 594 (1995-12-01), None
patent: 2 847 367 (2004-05-01), None
Bursch et al, Wavelet Transform for Analyzing Fog Visibility, IEEE Intelligent Systems, Nov./Dec. 1998, pp. 66-71.
Leleve et al, Fog Lamp Automation with Visibility Sensor, VDI Berichte Nr. 1907, 2005, pp. 151-160.
Hautiere et al., Drive Assistance Fog Detection and Measure of the Visibility Distance, undated.

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