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Document classification system and method for classifying a document according to contents of the document

  • US 7,194,471 B1
  • Filed: 04/09/1999
  • Issued: 03/20/2007
  • Est. Priority Date: 04/10/1998
  • Status: Expired due to Fees
First Claim
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1. A document classification system for classifying a document according to contents of the document, said document classification system comprising:

  • input means for inputting document data of the document;

    analyzing means for analyzing the document data so as to obtain analysis information;

    vector producing means for producing a document feature vector with respect to the document data based on the analysis information;

    transforming function calculating means for calculating a representation transforming function used for projecting the document feature vector onto a space in which similarity between the document feature vectors is reflected with a dimensional number different from a dimensional number of the document feature vector, the transforming function calculating means calculating the representation transforming function by using an inner product calculated between the document feature vectors;

    vector transforming means for transforming the document feature vector by using the representation transforming function;

    classification means for classifying the document based on similarity between the document feature vectors transformed by the vector transforming means; and

    classification result storing means for storing a result of classification performed by the classification means.

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