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Adaptive histogram-based video contrast enhancement

  • US 9,147,238 B1
  • Filed: 04/25/2014
  • Issued: 09/29/2015
  • Est. Priority Date: 12/07/2005
  • Status: Active Grant
First Claim
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1. A contrast enhancement system, comprising:

  • a histogram updater configured to;

    provide a histogram based on an image;

    determine arithmetic means for at least two regions of the histogram; and

    calculate variances for each of the determined arithmetic means;

    a weighting factor calculator configured to calculate weighting factors based on the calculated variances; and

    an equalizer configured to transform pixel values of the image using the weighting factors.

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