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Retrieval system and method using distance index

  • US 6,845,377 B2
  • Filed: 03/22/2002
  • Issued: 01/18/2005
  • Est. Priority Date: 11/06/2001
  • Status: Expired due to Fees
First Claim
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1. An information retrieval device which retrieves from among information items each having a plurality of feature parameters an information item having a feature parameter similar to a specified feature parameter, comprising:

  • a storage device storing an index which includes a plurality of concatenated keys and pointer information and retains a dictionary type order of the concatenated keys, each concatenated key being produced by discretizing a distance from each of a plurality of reference points to an object point representing information to be retrieved in a multidimensional space consisting of a plurality of dimensions corresponding to the plurality of feature parameters and by concatenating resulting discrete distances, the pointer information allowing access to information corresponding to the object point;

    a retrieval device determining a set of object points within a predetermined distance from a point specified in the multidimensional space and acquiring information corresponding to the object points in the set through the use of the index; and

    an output device outputting the acquired information.

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