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Symbol classification depending on cluster shapes in difference image

  • US 7,454,067 B1
  • Filed: 09/12/2003
  • Issued: 11/18/2008
  • Est. Priority Date: 09/12/2003
  • Status: Active Grant
First Claim
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1. A method for classifying elements of a digital image, the method comprising:

  • receiving an element of the digital image and a prototype representing a class of elements;

    generating a difference image representing differences between the received element and the prototype and including a plurality of ON pixels, each ON pixel representing a local difference between the received element and the prototype, wherein the difference image includes one or more clusters of ON pixels, each cluster including one or more neighboring ON pixels;

    determining relative arrangements of ON pixels in the difference image;

    assigning one or more scores to the difference image using the determined relative arrangements of ON pixels in the difference image;

    based on the scores assigned to the difference image, determining whether the received element of the image belongs to the class represented by the prototype; and

    generating a representation of the digital image, the representation including a symbol map associating one or more elements of the digital image with the prototype of the class.

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