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Detection of rain drops on a plate by means of a camera and illumination

A camera and glass technology, applied in the field of raindrop devices, can solve problems such as reduced sensitivity and misjudgment of rain signals.

Active Publication Date: 2014-10-01
CONTI TEMIC MICROELECTRONIC GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will be superimposed with the actual rain signal, which may lead to false positives of the rain signal
In order to avoid false triggering of the wipers, a sufficient tolerance can be set for the threshold value used to detect wetting of the windshield, but this in turn inevitably results in a corresponding loss of sensitivity

Method used

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  • Detection of rain drops on a plate by means of a camera and illumination
  • Detection of rain drops on a plate by means of a camera and illumination
  • Detection of rain drops on a plate by means of a camera and illumination

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Embodiment Construction

[0046] The more popular image sensor color filter is the Bayer pattern (or template) disclosed by US patent document 3971065 shown in Figure 1. It uses three primary colors, namely green G, red R, and blue B as color filters, and uses red - The distribution form of green-green-blue (RGGB) is used as the color filter pixel matrix.

[0047] showing a section of a Bayer template by means of figure 2 A first embodiment of the invention will be explained in detail.

[0048] In order to achieve simultaneous shooting of the background, it is illuminated with blue light. This makes it possible to detect rain- or wetness-dependent signals only at blue pixels (B, hatched), since red R and green G pixels are opaque to blue light.

[0049] Simultaneously measure the brightness of a blue pixel surrounded by eight red R and green G pixels. figure 2 is the brightness of the four red R pixels and four green G pixels surrounding the central blue pixel (bold B) (within the thicker grid lines...

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Abstract

The invention relates to a device and method for detecting rain (4). The device for detecting rain comprises a camera with an image sensor (5) and colour filters for pixels of the image sensor in a number of primary filter colours (R; G; B) and an illumination source (3) for producing monochrome light (h) of a first primary filter colour. The monochrome light is located in a visible wavelength range which is transmitted by the first primary filter colour and blocked by the other primary filter colours. The camera and the illumination source (3) are designed and arranged in such a manner that the camera can detect a signal from the monochrome light (r1, r2') with which the illumination source illuminates a plate (2).

Description

technical field [0001] The invention relates to a device and a method for detecting raindrops on glass by means of a light source and a camera. Background technique [0002] In US 7,259,367 B2, it is proposed to use a camera for rain perception, which sets a perspective window that uses a large area of ​​glass to illuminate the angle of view of the camera. The camera focuses almost to infinity and is used simultaneously or for driver assistance functions. Due to the imaging onto the distant area, the raindrops are only perceptible on the image as disturbances, which are detected by time-consuming difference measurements of the images captured with light pulsed or modulated synchronously with the pixel period . [0003] A device and a method for detecting rain are described in WO 2012 / 092911 A1. A camera is placed behind the glass, especially in a vehicle behind the windshield, and focused on a distant area located in front of the glass. The light source for generating at...

Claims

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Application Information

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IPC IPC(8): B60S1/08G01N21/55
CPCG01N21/55B60S1/08B60S1/0844G01N21/255G06V20/56H04N25/134B60S1/0874H04N2209/045H04N23/56
Inventor D·克勒克尔W·法伊C·科祖贝克M·兰德勒
Owner CONTI TEMIC MICROELECTRONIC GMBH
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