Detection of raindrops on a windowpane by means of camera and light
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A device and to a method for detecting rain, which includes a camera and a light source. The camera is arranged behind a windowpane, in particular inside a vehicle, behind a windscreen, and focused on a far range located in front of the windowpane. The light source for producing at least one light beam which is directed to the windowpane directs the at least one light beam to the windowpane in such a manner that at least one beam which is reflected by the outer side of the windowpane is incident on the camera. The structure of the image of the at least one beam reflected by the outer side of the windowpane is analyzed, in particular as part of an image processing step. The type of rain or precipitation on the outer side of the windowpane is classified based on the analysis of the structure of this image.
77 Citations
13 Claims
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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; andcomparing, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12)
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9. A device for detecting rain or precipitation on a windowpane, comprising:
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a camera which is arranged behind the windowpane, which camera is focused on a far range in front of the windowpane; 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 windowpane and is incident on the camera, where the beam (r1) is spatially separated from beams (r2;
r2′
);an image processing means configured to analyze the structure an image of the at least one beam (r2;
r2′
) reflected by the outer side of the windowpane, and compare the structure of the at least one beam (r2;
r2′
) to the structure of an image of the 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. - View Dependent Claims (13)
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Specification