Similarity search of time-warped subsequences via a suffix tree

Sanghyun Park, Wesley W. Chu, Jeehee Yoon, Jungim Won

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

This paper proposes an indexing technique for fast retrieval of similar subsequences using the time-warping distance. The time-warping distance is a more suitable similarity measure than the Euclidean distance in many applications where sequences may be of different lengths and/or different sampling rates. The proposed indexing technique employs a disk-based suffix tree as an index structure and uses lower-bound distance functions to filter out dissimilar subsequences without false dismissals. To make the index structure compact and hence accelerate the query processing, it converts sequences in the continuous domain into sequences in the discrete domain and stores only a subset of the suffixes whose first values are different from those of the immediately preceding suffixes. Extensive experiments with real and synthetic data sequences revealed that the proposed approach significantly outperforms the sequential scan and LB scan approaches and scales well in a large volume of sequence databases.

Original languageEnglish
Pages (from-to)867-883
Number of pages17
JournalInformation Systems
Volume28
Issue number7
DOIs
Publication statusPublished - 2003 Oct

All Science Journal Classification (ASJC) codes

  • Software
  • Information Systems
  • Hardware and Architecture

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