A METHOD AND A DEVICE FOR DETECTING FOG AT NIGHT

摘要

A method of detecting the presence of an element (fog, rain, etc. . . . ) disturbing the visibility of a scene illuminated by a headlight (105, 107) at night. The method comprises: a) acquiring an image of the scene with the help of a camera (120); b1) detecting the light sources in the image; b2) detecting the presence of the disturbing element as a function of the halo (H) appearing in the image in the vicinity of the light sources; c) detecting the presence of the disturbing element in the image as a function of the backscattering of the light emitted by the light sources; and d) weighting the results of the detections performed in steps b2) and c) in such a manner as to output an indication concerning the presence of the element disturbing the visibility of the scene. 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.