Multimedia Semantics by Schenk Simon Troncy Raphael Huet Benoit & Benoit Huet & Simon Schenk

Author:Schenk, Simon, Troncy, Raphael, Huet, Benoit & Benoit Huet & Simon Schenk
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2011-07-06T16:00:00+00:00

9.4 Requirements for Designing a Multimedia Ontology

Requirements for designing a multimedia ontology have been gathered together and reported in the literature (Hunter and Armstrong 1999). Here, we compile these and use our scenario to present a list of requirements for a Web-compliant multimedia ontology.

MPEG-7 compliance. MPEG-7 is an existing international standard, used in both the signal processing and broadcasting communities. It contains a wealth of accumulated experience that needs to be included in a Web-based ontology. In addition, existing annotations in MPEG-7 should be easily expressible in our ontology.

Semantic interoperability. Annotations are only reusable when the captured semantics can be shared among multiple systems and applications. Obtaining similar results from reasoning processes about terms in different environments can only be guaranteed if the semantics is sufficiently explicitly described. A multimedia ontology has to ensure that the intended meaning of the captured semantics can be shared among different systems.

Syntactic interoperability. Systems are only able to share the semantics of annotations if there is a means of conveying this in some agreed syntax. Given that the (Semantic) Web is an important repository of both media assets and annotations, a semantic description of the multimedia ontology should be expressible in a Web language (e.g. OWL, RDF/XML or RDFa).

Separation of concerns. Clear separation of subject matter (i.e. knowledge about depicted entities, such as the person Ellen Scott) from knowledge that is related to the administrative management or the structure and the features of multimedia documents (e.g. Ellen's face is to the left of Mike's face) is required. Reusability of multimedia annotations can only be achieved if the connection between both ontologies is clearly specified by the multimedia ontology.

Modularity. A complete multimedia ontology can be very large, as demonstrated by MPEG-7. The design of a multimedia ontology should thus be made modular, to minimize the execution overhead when used for multimedia annotation. Modularity is also a good engineering principle.

Extensibility. While we intend to construct a comprehensive multimedia ontology, this can never be complete, as demonstrated by ontology development methodologies. New concepts will always need to be added to the ontology. This requires a design that can always be extended, without changing the underlying model and assumptions and without affecting legacy annotations.

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