Vehicle vision system with reduction of temporal noise in images

  • US 10,326,969 B2
  • Filed: 08/11/2014
  • Issued: 06/18/2019
  • Est. Priority Date: 08/12/2013
  • Status: Active Grant
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First Claim
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1. A vision system of 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 an imaging array having rows and columns of photosensing elements;

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

    a display disposed in the vehicle and viewable by a driver of the vehicle, wherein said display is operable to display images derived from captured image data;

    wherein, responsive to image processing of captured image data by said image processor, temporal noise in displayed images derived from captured image data is reduced by determining a change in luminance values of photosensing elements from a first frame of captured image data to a second frame of captured image data and adjusting luminance values of photosensing elements for the displayed derived image responsive, at least in part, to the determined change in luminance of photosensing elements being above or below a threshold change;

    wherein, responsive to a determined change in a luminance value of a photosensing element being less than the threshold change from the first frame of captured image data to the second frame of captured image data, the change in luminance value for that photosensing element is dampened so as to not fully adopt the luminance value of that photosensing element of the second frame of captured image data for the displayed images; and

    wherein the threshold change is adjusted responsive to a determined ambient light level at the vehicle.

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