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Method and apparatus for determining the illumination type in a scene

  • US 6,515,275 B1
  • Filed: 04/24/2000
  • Issued: 02/04/2003
  • Est. Priority Date: 04/24/2000
  • Status: Expired due to Term
First Claim
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1. A method of determining the type of illuminant of a scene, comprising:

  • measuring the light coming from the scene over a first wavelength band;

    measuring the light coming from the scene over a second wavelength band;

    measuring the light coming from the scene over a third wavelength band;

    measuring the light coming from the scene over a fourth wavelength band, the fourth band including infrared radiation;

    determining the type of illuminant for the scene by comparing the intensity of the light in the fourth wavelength band to the intensity of light in the first, second and third wavelength bands.

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