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Automatic contrast enhancement

  • US 20050100242A1
  • Filed: 11/29/2004
  • Published: 05/12/2005
  • Est. Priority Date: 07/06/2001
  • Status: Active Grant
First Claim
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1. A computer-readable medium storing computer-executable instructions for performing a computer process for automatic contrast correction, the computer process comprising:

  • providing digital image data;

    representing the data in the form of a brightness histogram;

    determining a measure of central tendency for said histogram as a determined measure of central tendency;

    adding a shift value to the measure of central tendency to provide an adjusted measure of central tendency;

    computing a tone reproduction curve by a ratio containing logarithms of determined and adjusted measures of central tendency; and

    applying this tone reproduction curve to brightness values of the image.

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