Vehicle headlight control using imaging sensor with spectral filtering

  • US 7,402,786 B2
  • Filed: 10/06/2006
  • Issued: 07/22/2008
  • Est. Priority Date: 02/26/1993
  • Status: Expired due to Fees
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First Claim
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1. A control system for automatically controlling the state of the headlamps of a controlled vehicle, said control system comprising:

  • an optical system for imaging external light emitting sources within a predetermined field of view, said optical system including an image array sensor, said image array sensor comprising a pixelated imaging array;

    said pixelated imaging array comprising a plurality of light-sensing pixels arranged on a semiconductor substrate;

    said optical system further comprising a first spectral filter for passing visible light that is within a first spectral region that generally corresponds with the visible light spectral signature of a taillight of a vehicle, said first spectral filter substantially attenuating light having a wavelength greater than about 830 nanometers;

    said optical system imaging visible light passing via said first spectral filter onto a first array portion of said pixelated imaging array;

    said optical system imaging visible light passing via a second spectral filter onto a second array portion of said pixelated imaging array; and

    an image processing system for processing images from said optical system and for providing a control signal for controlling the state of headlamps of the controlled vehicle as a function of the output of at least one pixel sensing light passing via said first spectral filter and the output of another at least one pixel sensing light passing via said second spectral filter.

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