Vehicle vision system with lens pollution detection

  • US 10,021,278 B2
  • Filed: 04/18/2016
  • Issued: 07/10/2018
  • Est. Priority Date: 03/27/2012
  • Status: Active Grant
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First Claim
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1. A vision system for a vehicle, said vision system comprising:

  • a camera disposed at a vehicle and having a field of view exterior of the vehicle;

    wherein said camera comprises a lens and an imaging array comprising an array of photosensing elements having multiple columns of photosensing elements and multiple rows of photosensing elements;

    said multiple columns of photosensing elements being generally vertically orientated relative to ground when said camera is disposed at the vehicle;

    said multiple rows of photosensing elements being generally horizontally orientated relative to ground when said camera is disposed at the vehicle;

    said multiple rows of photosensing elements comprising top rows, middle rows and bottom rows;

    wherein, with said camera disposed at the vehicle, top rows are higher above ground than middle and bottom rows;

    wherein, with said camera disposed at the vehicle, middle rows are higher above ground than bottom rows and are lower above ground than top rows;

    wherein, with said camera disposed at the vehicle, middle rows are between top rows and bottom rows;

    a processor operable to process image data captured by said camera;

    wherein, when the vehicle is moving, top row brightness values at top rows are determined by processing of captured image data by said processor;

    wherein, when the vehicle is moving, middle row brightness values at middle rows are determined by processing of captured image data by said processor;

    wherein, when the vehicle is moving, bottom row brightness values at bottom rows are determined by processing of captured image data by said processor;

    wherein contrast of middle row brightness values compared to bottom row brightness values or top row brightness values is determined; and

    wherein, based on determined contrast of middle row brightness values compared to bottom row brightness values or top row brightness values, an at least partial blockage of said camera is detected.

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