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Illumination estimation for images

  • US 8,391,634 B1
  • Filed: 04/28/2009
  • Issued: 03/05/2013
  • Est. Priority Date: 04/28/2009
  • Status: Active Grant
First Claim
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1. A computer-implemented method of removing illumination variation from an image, the method performed by a computer and comprising:

  • selecting an image containing varying illumination;

    determining instances of a repeating pattern in the image;

    calculating inverse illumination values for pixels at locations within instances of the repeating pattern responsive to pixel intensities of pixels at corresponding locations in other instances of the repeating pattern; and

    for pixels in the image, multiplying a pixel intensity of a pixel by an inverse illumination value calculated for the pixel to remove the illumination variation from the image responsive to the calculation of the inverse illumination values.

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