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http://dx.doi.org/10.3745/KIPSTD.2011.18D.1.009

Efficient Rotation-Invariant Boundary Image Matching Using the Envelope-based Lower Bound  

Kim, Sang-Pil (강원대학교 컴퓨터과학과)
Moon, Yang-Sae (강원대학교 컴퓨터과학과)
Hong, Sun-Kyong (강원대학교 컴퓨터과학과)
Abstract
In this paper we present an efficient solution to rotation?invariant boundary image matching. Computing the rotation-invariant distance between image time-series is a time-consuming process since it requires a lot of Euclidean distance computations for all possible rotations. In this paper we propose a novel solution that significantly reduces the number of distance computations using the envelope-based lower bound. To this end, we first present how to construct a single envelope from a query sequence and how to obtain a lower bound of the rotation-invariant distance using the envelope. We then show that the single envelope-based lower bound can reduce a number of distance computations. This approach, however, may cause bad performance since it may incur a larger lower bound by considering all possible rotated sequences in a single envelope. To solve this problem, we present a concept of rotation interval, and using the rotation interval we generalize the envelope-based lower bound by exploiting multiple envelopes rather than a single envelope. We also propose equi-width and envelope minimization divisions as the method of determining rotation intervals in the multiple envelope approach. Experimental results show that our envelope-based solutions outperform existing solutions by one or two orders of magnitude.
Keywords
Boundary Image Matching; Data Mining; Rotation-Invariant Distance; Similar Sequence Matching; Envelope-Based Lower Bound;
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