DocumentCode
2014432
Title
Secure image databases through distributed source coding of SIFT descriptors
Author
Nambiar, Athira M. ; Tagliasacchi, Marco ; Magli, Enrico
Author_Institution
Inst. Super. Tecnico (IST), Lisbon, Portugal
fYear
2012
fDate
17-19 Sept. 2012
Firstpage
130
Lastpage
135
Abstract
The adoption of distributed databases calls for storing data at two or more sites, in order to address application-specific requirements including, e.g., redundancy, data locality, and so on. When visual data (including images, videos and their corresponding descriptors) need to be stored, synchronization across different sites might require significant bandwidth resources. In this paper we explore the use of distributed source coding to encode local SIFT descriptors extracted from static images. The key tenet is to exploit, at the decoder side, the correlation between matching pairs of descriptors extracted, respectively, from the out-of-date and up-to-date image. Preliminary results show that a coding efficiency gain up to 1 bit/descriptor can be achieved in the case of ideal lossless coding. In the case of distributed source coding with LDPC codes, a practical average gain of 0.19 bit/descriptor is observed.
Keywords
image coding; parity check codes; security of data; visual databases; LDPC codes; SIFT descriptors; application-specific requirements; data locality; distributed databases; distributed source coding; lossless coding; matching descriptor pairs; secure image databases; static images; Correlation; Decoding; Distributed databases; Encoding; Joints; Protocols; Image coding; distributed databases; multimedia databases;
fLanguage
English
Publisher
ieee
Conference_Titel
Multimedia Signal Processing (MMSP), 2012 IEEE 14th International Workshop on
Conference_Location
Banff, AB
Print_ISBN
978-1-4673-4570-5
Electronic_ISBN
978-1-4673-4571-2
Type
conf
DOI
10.1109/MMSP.2012.6343428
Filename
6343428
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