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Rautiainen M, Seppänen T & Ojala T (2006)
Advancing content-based retrieval effectiveness with cluster-temporal browsing in multilingual video databases.
Proc. 2006 IEEE International Conference on Multimedia & Expo, Toronto, Canada, 377-380.
Interactive experiments on video retrieval systems need to address the
problem of internal validity, i.e. how much the test users' experience
affects the retrieval effectiveness. This paper compares the semantic
retrieval performance of novice users and expert system developers. The test
system utilizes cluster-temporal browsing, which combines chronological
video structure and computation of similarities into single interface.
Interactive experiments with eight test users were carried out in a database
of ~80 hours of multilingual news video from TRECVID 2005 benchmark. A
cluster-temporal browser was found to improve the retrieval effectiveness by
12% with novice system users. Expert users were able to achieve 18% better
performance than the novice users. Additionally, manual search experiments
demonstrated that search performance can be improved by 19-25% when a plain
text search is supplemented with content-based features.