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Context-Aware Modeling of Multimedia Content

media objects semantic unit

Multimedia content can have multiple semantics varying over time, i.e. the relevance of metadata used for describing the meaning of the multimedia content depends on the underlying context. Herein, context is defined as a set of concepts from a particular domain that is supposed to encode a view of a party. In comparison to ontologies that stand for themselves and are built to be shared, the context is kept with the content (and often sharing makes only sense together with the content). However, the technical requirements for describing and managing ontology knowledge or context knowledge are the same. Context-aware modeling of multimedia content means allowing incorporating domain knowledge into the document model for multimedia content.

Context-aware multimedia content needs to be authored, exchanged, and traded between different applications. Therefore one important prerequisite for the realization of context-aware multimedia applications is to establish an exchangeable container unit that aggregates and interrelates the described media objects. The classification of media objects and interrelations between media objects should allow to reflect the particular context. This can be realized by labeling them with concepts originating from the context domain. Finally, as the multimedia content and the associated context information possibly changes over time, the container units and their components should provide some versioning support.

Existing standards for multimedia document models, such as HTML, SMIL, or SVG, have all in common that they merely focus on the encoding of the content, but neglect the information the content conveys. As they are limited to the modeling of presentation-related issues of multimedia content, only inflexible hard-wired, multimedia presentations can be realized. Although, current semantic approaches to multimedia content modeling, such as RDF, Topic Maps, or MPEG-7, establish a starting point for the integration of the required meta knowledge within the management of multimedia content, they do not provide an exchangeable and versionable container unit aggregating both, the multimedia content’s media objects and semantic descriptions.

EMMOs, Enhanced Multimedia Meta Objects, are a good example for a modeling approach providing a basis for the context-aware modeling of multimedia content. An EMMO constitutes a versionable and tradable unit that combines media, semantic relationships between media, as well as functionality on the media. The semantic aspect of the EMMO model allows to integrate context information; the unit-character and exchangeable feature of an EMMO allows to share and circulate pieces of context-aware multimedia content within communities or application domains.

Context-Aware Multimedia - Introduction, Context, Context-Awareness, Context-A ware Multimedia, Modeling, Retrieval, Authoring and Presentation, Summary [next] [back] Context and Current Metadata Standards

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