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Advances in Multimedia
Volume 2011 (2011), Article ID 421820, 9 pages
http://dx.doi.org/10.1155/2011/421820
Research Article

Fast Retrieval Algorithm for Earth Mover's Distance Using EMD Lower Bounds and a Skipping Algorithm

1Department of Information Solution, Institute of Technology and Science, The University of Tokushima, 2-1 Minami-Josanjima-Cho, Tokushima-Shi, Tokushima 770-8506, Japan
2Center for Advanced Information Technology, The University of Tokushima, 2-1 Minami-Josanjima-Cho, Tokushima-Shi, Tokushima 770-8506, Japan

Received 2 September 2010; Revised 20 January 2011; Accepted 19 March 2011

Academic Editor: Deepu Rajan

Copyright © 2011 Masami Shishibori et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The earth mover's distance (EMD) is a measure of the distance between two distributions, and it has been widely used in multimedia information retrieval systems, in particular, in content-based image retrieval systems. When the EMD is applied to image problems based on color or texture, the EMD reflects the human perceptual similarities. However, its computations are too expensive to use in large-scale databases. In order to achieve efficient computation of the EMD during query processing, we have developed “fastEMD,” a library for high-speed feature-based similarity retrievals in large databases. This paper introduces techniques that are used in the implementation of the fastEMD and performs extensive experiments to demonstrate its efficiency.