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Detection of raindrops on a windowpane by means of camera and light

  • US 9,702,818 B2
  • Filed: 04/26/2013
  • Issued: 07/11/2017
  • Est. Priority Date: 05/03/2012
  • Status: Active Grant
First Claim
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1. A method for detecting rain or precipitation on an outer side of a windowpane, comprising:

  • arranging a camera behind the windowpane and focusing the camera on a far range in front of the windowpane;

    producing, by a light source, for producing at least one light beam (h) which is directed to the windowpane, wherein the light source directs the at least one light beam (h) to the windowpane in such a manner that;

    1) at least one beam (r2;

    r2

    ) is reflected by the outer side of the windowpane and is incident on the camera, and2) a beam (r1) is reflected by the inner side of the window pane and is incident on the camera, where the beam (r1) is spatially separated from beams (r2;

    r2

    );

    recording, by the camera an image of the at least one beam (r2;

    r2

    ) reflected by the outer side of the windowpane and the beam (r1) reflected by the inner side of the windowpane; and

    comparing, by an image processing means, the structure of the image of the at least one beam (r2;

    r2

    ) reflected by the outer side of the windowpane the structure of an image of the at least one beam (r1) reflected by the inner side of the windowpane in order to classify the type of rain or precipitation on the outer side of the windowpane.

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