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290 Selected Studies on Software and Information Systems
the number of overlapping images and the circles in their respective centers denote the
overlap returned by an image classifier, which evaluates low-level image properties
against the query. The outer Classifier sphere works the same way, yet describes a different
set of results, which are returned by the classifier instead of a tag search. E.g., for sets
leaves and park the tags seem to match the low-level image properties quite well, while
having high overlap with the user’s collection.
Figure 10-17. Tag visualization via TagSphere,
taken from (Aurnhammer, Hanappe, & Steels, 2006).
10.7 Existing Navigation Solutions
Based on our prior analysis we identified faceted browsers and view-based search as suitable
navigation means for large information spaces based on the Semantic Web, mainly
due to their user friendly GUI, high expressivity via faceted classification and overall suitability
for large data collections. Consequently, we examined the properties of several
existing faceted browsers:
− Factic: Adaptive faceted semantic browser (Tvarožek & Bieliková, Personalized Faceted
Navigation for Multimedia Collections, 2007).
− Ontoviews: A tool for creating Semantic Web portals (Mäkelä et al., 2004).
− BrowseRDF: Faceted RDF browser (Oren, Delbru, & Decker, 2006).
− /facet: Browser for heterogeneous semantic repositories (Hildebrand, van Ossenbruggen,
& Hardman, 2006).
− IGroup: Image search engine (Wang, Jing, He, Du, & Zhang, 2007).