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EDGE DETECTION

  • US 20120093434A1
  • Filed: 06/05/2009
  • Published: 04/19/2012
  • Est. Priority Date: 06/05/2009
  • Status: Active Grant
First Claim
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1. An edge detection method for detecting a substantially linear edge in a digital image, the method comprising the steps of:

  • calculating a pixel gradient value for each of a plurality of pixels of a digital image, the pixel gradient value representing the difference of a pixel value with respect to at least one neighbouring pixel;

    for each of a plurality of binarization threshold values, determining a corresponding edge map representing the location of pixel gradient values exceeding the binarization threshold value with respect to a side of the digital image;

    for each edge map, computing a measure of linearity;

    determining an optimal binarization threshold value based on the computed measures of linearity; and

    selecting the edge map corresponding to the optimal binarization threshold value.

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