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Method and means for recognizing patterns represented in logarithmic polar coordinates

  • US 5,063,604 A
  • Filed: 11/08/1989
  • Issued: 11/05/1991
  • Est. Priority Date: 11/08/1989
  • Status: Expired due to Term
First Claim
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1. A method of processing image data to detect the presence of an extended feature or features of interest therein, the method comprising the steps of:

  • providing an image represented in a logarithmic polar (log-polar) coordinate system;

    selecting image points which are candidates for membership in the feature of interest;

    for each selected image point, constructing a curve in the same logarithmic polar coordinate system as the image, the curve characterizing the locus of possible locations of the feature of interest consistent with the selected image point;

    accumulating a histogram whose bins coincide with points in the same logarithmic polar coordinate system as the image, which bins contain counts of the number of constructed curves intersecting at the location of the bin; and

    selecting bins having greatest counts as representing the locations of definitive points for characterizing the location of the extended feature of interest within the image.

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