Boundary-based lower-bound functions for dynamic time warping and their indexing

  • Authors:
  • Mi Zhou;Man Hon Wong

  • Affiliations:
  • Electrical and Information College, Jinan University, Guangdong, China;Department of Computer Science and Engineering, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2011

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Abstract

Dynamic time warping (DTW) is a powerful technique in the time-series similarity search. However, its performance on large-scale data is unsatisfactory because of its high computational cost and the fact that it cannot be indexed directly. The lower bound technique for DTW is an effective solution to this problem. In this paper, we explain the existing lower-bound functions from a unified perspective and show that they are only special cases under our framework. We then propose a group of lower-bound functions for DTW and compare their performances through extensive experiments. The experimental results show that the new methods are better than the existing ones in most cases, and a theoretical explanation of the results is also given. We further implement an index structure based on the new lower-bound function. Experimental results demonstrate a similar conclusion.