Method for detecting nocturnal fog and system for implementing the method
AssigneeValeo Vision
InventorsJoel Leleve, Abdelaziz Bensrhair, Julien Rebut
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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.
Claims25
A method for detecting, by night, the presence of an element such as fog interfering with the visibility of a road scene situated at the 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 said at least one light halo by an elliptic curve, and
- comparing the form of said at least one light halo with the elliptic curve obtained in order to deduce therefrom the presence or absence of an element interfering with visibility.
A system 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, said system comprising:
- a camera for acquiring images of the road scene;
- image processing means for extracting at least one light halo from a captured image of the road scene for producing an approximation of a form of said at least one light halo by an elliptic curve and for comparing the form of said at least one light halo with said elliptic curve in order to deduce therefrom the presence or absence of the element interfering with visibility.
A method for detecting an element interfering with the visibility of a road scene illuminated by at least one light of a vehicle:
- capturing an image of the road scene;
- extracting at least one light halo from said image;
- and
- deducing the presence or absence of the element using said at least one light halo.
Dependencies are inferred from the claim text.