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Image color balance for scanners using an illumination spectral sensor

  • US 7,251,065 B2
  • Filed: 01/31/2002
  • Issued: 07/31/2007
  • Est. Priority Date: 01/31/2002
  • Status: Active Grant
First Claim
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1. An image scanning system for producing an electronic version of a hardcopy which is compensated for variations in the spectral content of an illumination source in the image scanning system, the image scanning system comprising:

  • (a) a first sensor for receiving light reflected or transmitted from the hardcopy, and for forming and storing an electronic image version of the hardcopy;

    (b) a second sensor for receiving light from the illumination source and for forming and storing an electronic version of the spectral contents of the illumination source; and

    (c) a conversion system for receiving the electronic version of the illumination source, and computing the contents of a LUT (Look Up Table) such that subsequent electronic images passed through the LUT are properly compensated for the spectral content of the illumination.

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