Auflistung nach Autor:in "Osterhoff, Johannes"
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- KonferenzbeitragOpen up cultural heritage in video archives with mediaglobe(12th International Conference on Innovative Internet Community Services (I2CS 2012), 2012) Hentschel, Christian; Hercher, Johannes; Knuth, Magnus; Osterhoff, Johannes; Quehl, Bernhard; Sack, Harald; Steinmetz, Nadine; Waitelonis, Jörg; Yang, HaojinFilm, video, and TV have become a predominant medium, but most audiovisual (AV) material being part of our cultural heritage is kept in archives without the possibility of appropriate access for the public. Although digitalization of AV objects in conjunction with AV analysis is making progress, content-based retrieval remains difficult because of the so called semantic gap. The Mediaglobe project is focussed on digitalization, indexation, preservation and exploitation of historical AV archives. In this context, we show how traditional AV analysis is complemented with semantic technologies and user-generated content to enable content-based retrieval exposing contentual dependencies to promote new means of visualization and explorative navigation within AV archives.
- KonferenzbeitragSneak preview? Instantly know what to expect in faceted video searching(INFORMATIK 2011 – Informatik schafft Communities, 2011) Osterhoff, Johannes; Waitelonis, Jörg; Jäger, Joscha; Sack, HaraldThis paper presents the Semantic Multimedia Explorer (SEMEX) a semantic search engine that supports exploratory video retrieval. SEMEX combines entities and content-based suggestions to support semantic search. The SEMEX interface provides facet filters, entity recommendations, a pagination and browsable search results; all of these elements are interconnected by instant “linking and brushing”. Hence SEMEX enables instantaneous visual feedback on how a selected search facet will affect the displayed result set. This unique feature facilitates a quicker and clearer search process compared to other systems that need to perform new search queries to achieve a similar result. By making the subsequent results available at fingertips, the SEMEX interface allows users to pursue related exploratory search strategies that lead to a genuinely responsive and quick browsing experience.
- KonferenzbeitragWiden the peepholes! Entity-based auto-suggestion as a rich and yet immediate starting point for exploratory search(INFORMATIK 2012, 2012) Osterhoff, Johannes; Waitelonis, Jörg; Sack, HaraldToday's search engines provide instant keyword-based auto-suggestion and completion of the user's search queries. This paper presents a novel auto-suggestion interface for the Semantic Multimedia Explorer (SEMEX), a semantic search engine that supports entity-based exploratory video retrieval. In difference to traditional textbased retrieval, auto-suggestion and auto-completion of the user's query string is not based on plain text but on semantic entities grouped by meaningful categories. Suggested entities are ranked by plain edit-distance as well as by popularity while their representations are enabled for brushing and linking. The categories contribute to a quick comprehensibility of the suggested entities compared to other systems that constrain an actually significant and practical feature into static and narrow vertical listings. Thus, our approach is leading to better decision making from the very start of an exploratory search.