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Integrating similar images to effectively improve image retrieval accuracy

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2 Author(s)
Hai Thanh Mai ; Dept. of Comput. Sci., KAIST, Daejeon, South Korea ; Kim, M.H.

Retrieving similar images based on its visual content is an important yet difficult problem. We propose in this paper a new method to improve the accuracy of content-based image retrieval systems. Typically, given a query image, existing retrieval methods return a ranked list based on the similarity scores between the query and individual images in the database. Our method goes further by relying on an analysis of the underlying connections among individual images in the database to improve this list. Initially, we consider each image in the database as a virtual query and use an existing baseline method to search for its likely similar images. Then, the database is modeled as a directed graph where images are nodes and directed connections among possibly similar images are edges. Next, we introduce an algorithm to split this graph into stronger subgraphs, based on our notion of graph's strength, so that images in each subgraph are expected to be truly similar to each other. We create for each subgraph a structure called integrated image which contains the visual features of all images in the subgraph. At query time, we compute the similarity scores not only between the query and individual database images but also between the query and the integrated images. The final similarity score of a database image is computed based on both its individual score and the score of the integrated image that it belongs to. This leads effectively to a re-ranking of the retrieved images. We evaluate our method on a common image retrieval benchmark and demonstrate a significant improvement over the traditional bag-of-words retrieval model.

Published in:

Computing Technology and Information Management (ICCM), 2012 8th International Conference on  (Volume:1 )

Date of Conference:

24-26 April 2012

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