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ture analysis and identified the most important fea-
tures in the retrieval scenario. This shows the appro-
priateness of our feature design and also allows to fur-
ther improve the retrieval performance by restricting
the set of features that are used in the discriminative
model.
ACKNOWLEDGEMENTS
This work was funded by the Multipla project
7
spon-
sored by the German Research Foundation (DFG) un-
der grant number 38457858 as well as by the Monnet
project
8
funded by the European Commission under
FP7.
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