HierarchyScan: A Hierarchical Similarity Search Algorithm for Databases of Long Sequences

  • Authors:
  • Chung-Sheng Li;Philip S. Yu;Vittorio Castelli

  • Affiliations:
  • -;-;-

  • Venue:
  • ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
  • Year:
  • 1996

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Abstract

We present a hierarchical algorithm, HierarchyScan, that efficiently locates one-dimensional subsequences within a collection of sequences of arbitrary length. The subsequences identified by HierarchyScan match a given template pattern in a scale- and phase-independent fashion. The idea is to perform correlation between the stored sequences and the template in the transformed domain hierarchically. Only those subsequences whose maximum correlation value is higher than a predefined threshold will be selected. The performance of this approach is compared to the sequential scanning and an order-of-magnitude speedup is observed.