Vehicle vision system with lens pollution detection

  • US 9,319,637 B2
  • Filed: 03/27/2013
  • Issued: 04/19/2016
  • 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;

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

    wherein, when the vehicle is moving in a forward or rearward direction, said processor is operable to at least one of (a) read a selected set of imager register values and compare a contrast of auto exposure control zones, and wherein, responsive to a determination that a range of contrast levels is less than a threshold level, said processor determines that there are contaminants at said lens of said camera, and (b) monitor outputs of photosensing elements of said imaging array and wherein, when said photosensing element outputs fit a Gaussian distribution, said processor classifies said photosensing elements as blocked photosensing elements and, responsive to a determination that a number of said blocked photosensing elements is greater than a threshold level, said processor determines that there are contaminants at said lens of said camera; and

    wherein, when said processor determines that there are contaminants at said lens of said camera, said system at least one of (i) generates an alert, (ii) adapts processing of image data to at least partially accommodate for the presence of the determined contaminants and (iii) cleans said lens.

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