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Method for Image Skew Detection

  • US 20100067826A1
  • Filed: 09/15/2009
  • Published: 03/18/2010
  • Est. Priority Date: 09/18/2008
  • Status: Active Grant
First Claim
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1. A method for calculating a skew angle of an original image, the method executed at least in part on a computer system and comprising:

  • storing image data for the original image in an electronic memory;

    forming an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data;

    forming a partitioned image by partitioning the energy-normalized image into a plurality of sub-regions;

    forming a summed region as a combination of image pixel data from the plurality of sub-regions;

    obtaining a Fourier magnitude spectrum by performing a Fourier transform on the summed region;

    calculating the skew angle according to a peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles; and

    providing an output signal that is indicative of the calculated skew angle.

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