Method and device for detecting fog at night
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United States of America Patent
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Oct 27, 2015
Grant Date -
Jan 30, 2014
app pub date -
Sep 28, 2011
filing date -
Sep 28, 2010
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Abstract
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; andd) 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.
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