Vehicle camera with multiple spectral filters

  • US 10,132,971 B2
  • Filed: 03/01/2017
  • Issued: 11/20/2018
  • Est. Priority Date: 03/04/2016
  • 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 configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle;

    wherein said camera comprises a lens and an imager and wherein light passing through said lens is received at said imager via an optic path from said lens to said imager;

    wherein said imager comprises a pixelated imaging array having a plurality of photosensing elements;

    wherein, responsive to processing by said image processor of image data captured by said camera, said control determines a lighting condition at said camera;

    wherein said camera comprises at least two spectral filters, wherein each of said spectral filters has a respective cutoff wavelength and (i) passes visible light below the respective cutoff wavelength, and (ii) attenuates light above the respective cutoff wavelength;

    a control, wherein said control is operable to move said spectral filters relative to the optic path such that a selected spectral filter is positioned in the optic path during operation of said camera;

    wherein said control moves said at least two spectral filters via one of (i) linear movement of a row of spectral filters and (ii) rotational movement of spectral filters arranged on a rotary support;

    wherein said control positions the selected spectral filter of said at least two spectral filters in the optic path so that said imager images visible light below the respective cutoff wavelength of the selected spectral filter;

    wherein a first spectral filter of said at least two spectral filters has a first cutoff wavelength that is shorter than a second cutoff wavelength of a second spectral filter of said at least two spectral filters;

    wherein said control is operable to position said first spectral filter in the optic path responsive to a determination of a brighter lighting condition at said camera, and wherein said control is operable to position said second spectral filter in the optic path responsive to a determination of a lower lighting condition at said camera;

    wherein said control positions said first spectral filter in the optic path responsive to determination of ambient light of greater than 100 lux, and wherein said control positions said second spectral filter in the optic path responsive to determination of ambient light of less than 100 lux;

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

    wherein said control is operable to move the selected one of said at least two spectral filters to be in the optic path and to move the unselected one of said at least two spectral filters to be out of the optic path.

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