Istituto di Scienza e Tecnologie dell'Informazione     
Falchi F., Gennaro C., Rabitti F., Zezula P. Distance browsing in distributed multimedia databases. In: Future Generation Computer Systems, vol. 25 (1) pp. 64 - 76. Elsevier, 2009.
The state of the art of searching for non-text data (e.g., images) is to use extracted metadata annotations or text, which might be available as a related information. However, supporting real content-based audiovisual search, based on similarity search on features, is significantly more expensive than searching for text. Moreover, such search exhibits linear scalability with respect to the dataset size, so parallel query execution is needed. In this paper, we present a Distributed Incremental Nearest Neighbor algorithm (DINN) for finding closest objects in an incremental fashion over data distributed among computer nodes, each able to perform its local Incremental Nearest Neighbor (local-INN) algorithm. We prove that our algorithm is optimum with respect to both the number of involved nodes and the number of local-INN invocations. An implementation of our DINN algorithm, on a real P2P system called MCAN, was used for conducting an extensive experimental evaluation on a real-life dataset. The proposed algorithm is being used in two running projects: SAPIR and NeP4B.
URL: http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235638%232009%23999749998%23697585%23FLA%23&_cdi=5638&_pubType=J&_auth=y&_acct=C000061181&_version=1&_urlVersion=0&_userid=3967543&md5=aac0b925786aa5ec58212043430c7d60
DOI: 10.1016/j.future.2008.02.007
Subject Distributed
Nearest neighbor
Similarity search
Content addressable networks
Metric spaces
E.1 Data Structures
H.3.3 Information Search and Retrieval

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