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Method and apparatus for indexing and retrieving images using visual keywords

  • US 6,574,378 B1
  • Filed: 07/08/1999
  • Issued: 06/03/2003
  • Est. Priority Date: 01/22/1999
  • Status: Expired due to Fees
First Claim
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1. A method of indexing and retrieving a visual document using visual keywords, said method including the steps of:

  • providing a plurality of visual keywords derived using a learning technique from a plurality of visual tokens extracted across a predetermined number of visual elements;

    each said visual token being a coherent unit of the visual document, and representing a visual content domain, comparing a plurality of visual tokens of another visual document with said visual keywords, a comparison result being represented by a three-dimensional map of detected locations of said visual keywords; and

    determining a spatial distribution of visual keywords dependent upon said comparison result to provide a visual-content signature for said visual document.

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