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Concept-based categorization of unstructured objects

  • US 7,536,413 B1
  • Filed: 12/05/2005
  • Issued: 05/19/2009
  • Est. Priority Date: 05/07/2001
  • Status: Expired due to Term
First Claim
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1. A computer-based method of associating an unstructured object with a category, comprising:

  • receiving an unstructured object, the unstructured object being associated with at least one concept;

    calculating an inverted category ratio and a concept ratio for each concept associated with the unstructured object, the inverted category ratio for a concept being exp(−

    Nci/Nc), Nc being the number of categories in the plurality of categories and Nci being the number of categories in which that concept occurs;

    the concept ratio for a concept being the ratio of the number of times that concept occurs in the unstructured object over the total number of concepts that occur in the unstructured object;

    calculating a category normalization ratio for each category in a plurality of categories;

    associating the unstructured object with at least one category in the plurality of categories based on the inverted category ratio, the concept ratio, and the category normalization ratio; and

    outputting, to a user display, information showing the correspondence between the unstructured object and the at least one category.

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