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Luminance correction apparatus for image signals

  • US 5,671,013 A
  • Filed: 10/28/1992
  • Issued: 09/23/1997
  • Est. Priority Date: 10/31/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus for correcting a luminance level of a still picture, comprising:

  • means for obtaining a first image of an object comprised of pixels having first image information and a second image of the same object comprised of corresponding pixels having second image information;

    means for setting a boundary luminance level smaller than a maximum luminance level of said first image and larger than a minimum luminance level of said first image;

    means for determining a correspondent luminance level of said pixels of said second image which correspond with those pixels of said first image having said boundary luminance level;

    means for determining a respective substitution correction value for each pixel of said second image which corresponds with a respective pixel of said first image having a luminance level above or below said boundary luminance level, each said respective substitution correction value being a function of said boundary luminance level and said correspondent luminance level; and

    means for substituting each of said pixels of said first image having said luminance level above or below said boundary luminance level with said corresponding respective pixel of said second image corrected by said respective substitution correction value, each of the substituted corrected pixels having a luminance value within a luminance range extending from said minimum luminance level to said maximum luminance level of said first image.

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