Rain sensor with fog discrimination

  • US 6,353,392 B1
  • Filed: 04/27/2000
  • Issued: 03/05/2002
  • Est. Priority Date: 10/30/1997
  • Status: Expired due to Term
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First Claim
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1. A vehicular rain sensor which senses at least one of rain and fog on a vehicle window, said vehicular sensor comprising:

  • an imaging array sensor directed at the vehicle window from inside the vehicle, said imaging array sensor comprising a plurality of pixels, said pixels sensing a light value of incident radiation; and

    a computer based control having an edge detection algorithm, said edge detection algorithm being operable to sum light values sensed by said pixels and compare the summed light values to a predetermined threshold value, said control being responsive to an output of said imaging array sensor and the predetermined threshold value in order to indicate precipitation on a surface of the window.

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