Patent AT-E399687-T1: [Translated] RAIN DETECTION APPARATUS AND METHOD

A rain detection apparatus and method, comprising a camera (10) adapted to view a surface (16) and a processor (12) adapted to capture at least one image from the camera (10), in which the processor (12) is further adapted to generate at least one signal indicative of the presence of rain on the surface from information contained in the at least one captured image and to, optionally drive surface cleaning apparatus in response thereto, in which the apparatus is adapted to capture images focussed at a plurality of distances; in which the processor includes edge detection means adapted to detect edges visible in the at least one captured image and difference means adapted to calculate the difference between the number of edges visible between differing images; and in which the edge detection means is further adapted to disregard edges close to areas of light larger than the largest raindrop that is desired or expected to be detected.

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  "009:25"
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  "009:066"
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  "NIH"
]