Laboratoire Central Des Ponts Et Chaussees

Institut Francais Des Sciences Et Technologies Des Transports, De L'amenagement Et Des Reseaux

Institut National De Recherche Sur Les Transports Et Leur Securite

Nicolas Hautiere

Didier Aubert

Aurélien Cord

Romain Gallen

Raphaël Labayrade

A method of detecting the presence of an element (fog, rain, etc. . . . ) disturbing the visibility of a scene illuminated by a headlight () at night. The method comprises: The method provides satisfactory results in an environment with or without lighting. The invention also provides a computer program and a device for implementing the method.

Method and device for detecting fog at night

The invention relates to a device for determining visibility distance in a landscape. The device comprises a camera for taking an image of said landscape; means for storing said image; means for associating each pixel of the image with information representative of the distance between the camera and the point in the landscape corresponding to said pixel, thereby obtaining a map of distances; means for processing the image to detect whether a pixel of the image presents contrast greater than a predetermined value relative to at least some adjacent pixels; means for applying said processing for detecting contrast successively to the pixels of the image beginning from the pixel corresponding to the greatest distance and continuing to the first pixel found to satisfy the contrast condition; and means for associating said pixel with distance information from said map of distances.

Device for measuring visibility distance

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Paris, France

Nicolas Hautiere