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A context-aware middleware for real-time semantic enrichment of distributed multimedia metadata

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Abstract

This paper investigates the problem of the real-time integration and processing of multimedia metadata collected by a distributed sensor network. The discussed practical problem is the efficiency of the technologies used in creating a Knowledge Base in real-time. Specifically, an approach is proposed for the real-time, rule-based semantic enrichment of lower level context features with higher-level semantics. The distinguishing characteristic is the provision of an intelligent middleware-based architecture on which low level components such as sensors, feature extraction algorithms, data sources, and high level components such as application-specific ontologies can be plugged. Throughout the paper, Priamos, a middleware architecture based on Semantic Web technologies is presented, together with a stress-test of the system’s operation under two test case scenarios: A smart security surveillance application and a smart meeting room application. Performance measurements are conducted and corresponding results are exposed.

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Notes

  1. Extensible Metadata Platform (XMP): http://www.adobe.com/products/xmp/.

  2. The SmartWeb project: http://smartweb.dfki.de/.

  3. The PICSEL project: http://www.lri.fr/~sais/picsel3/.

  4. The CHIL project: http://chil.server.de.

  5. Talis homepage: http://www.talis.com.

  6. OpenLink software homepage: http://www.openlinksw.com.

  7. According to [11] the most used ontology authoring environments are Protégé, SWOOP and OntoEdit.

  8. Dublin Core Metadata Element Set: http://www.dublincore.org/documents/dces/.

  9. Creative Commons, Describing Copyright in RDF: http://creativecommons.org/ns.

  10. FOAF Vocabulary Specification: http://xmlns.com/foaf/spec/.

  11. XPath 2.0 is a W3C recommendation since Jan. 23, 2007: http://www.w3.org/TR/xpath20/.

  12. Among the most reliable sources is the prominent Swoogle (http://swoogle.umbc.edu). Noticeable results are also produced with the filetype:owl or filetype:rdf google operators.

  13. Not to be confused with external software applications, here by the term “application”, we note an application built on top of the middleware, i.e. the middleware configured for specific sensors, ontology models and message syntax.

  14. Delete or Update functions are not included in the W3C SPARQL recommendation [41].

  15. Note that due to the openness of the Web, no standards can be imposed or strictly followed. The closest approach to standardisation are the W3C or other consortia’s recommendations.

  16. SWSF Overview: http://www.w3.org/Submission/SWSF/.

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Acknowledgements

The work presented in this paper is carried out within the Priamos project, sponsored by the Greek General Secretarial of Research and Technology “Image, Sound, Language” research and development action. The authors of this paper would like to thank their colleagues in Athens Information Technology (http://www.ait.edu.gr/) for their collaboration.

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Authors and Affiliations

  1. National Technical University of Athens, Heroon Polytechneiou str., 15773, Zografou, Athens, Greece

    Nikolaos Konstantinou, Emmanuel Solidakis, Anastasios Zafeiropoulos, Panagiotis Stathopoulos & Nikolas Mitrou

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  1. Nikolaos Konstantinou
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  2. Emmanuel Solidakis
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  3. Anastasios Zafeiropoulos
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  4. Panagiotis Stathopoulos
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  5. Nikolas Mitrou
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Correspondence to Nikolaos Konstantinou.

Appendices

Appendix A: the Priamos mapping rule language syntax

Below is provided the grammar for the Priamos Rule language. We use the BNF metasyntax to clarify the use of both subsets of the rule language: the Mapping and the Semantic Rule Language.

Appendix B: the Priamos semantic rule language syntax

For both languages, String and Integer denote strings and integers respectively in programming language terms. OntClass and OntProperty refer to the full URIs or the QNames of classes and properties of the ontology, respectively. PathToExecutable is the full path to an executable file of the Operating System’s filesystem, and finally, XPathExpression is an XPath expression used to select nodes from an XML document.

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Konstantinou, N., Solidakis, E., Zafeiropoulos, A. et al. A context-aware middleware for real-time semantic enrichment of distributed multimedia metadata. Multimed Tools Appl 46, 425–461 (2010). https://doi.org/10.1007/s11042-009-0361-1

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