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Method of processing image signal

  • US 6,668,079 B2
  • Filed: 05/11/2001
  • Issued: 12/23/2003
  • Est. Priority Date: 11/29/1996
  • Status: Expired due to Fees
First Claim
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1. A method of processing an image signal, comprising:

  • converting device-dependent image signals produced from an original scene into a plurality of colorimetric signals and converting said colorimetric signals into colorimetric equivalent-neutral-density signals of said original scene;

    generating rough data of said colorimetric equivalent-neutral-density signals;

    setting up automatically a gradation conversion curve based on said rough data;

    converting gradations of said colorimetric equivalent-neutral-density signals based on said gradation conversion curve; and

    converting the colorimetric equivalent-neutral-density signals whose gradations have been converted into a plurality of colorimetric signals;

    wherein setting up the gradation conversion curve comprises determining a cumulative histogram of density values and assigning a high density point and a low density point based on the histogram values.

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