An Object-Oriented Approach to Temporal Multimedia Data Modeling

Yoshifumi MASUNAGA  

IEICE TRANSACTIONS on Information and Systems   Vol.E78-D   No.11   pp.1477-1487
Publication Date: 1995/11/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Database Technologies)
Category: Model
multimedia databases,  temporal databases,  object-oriented databases,  temporal objects,  sund,  video,  temporal attributes,  temporal relationships,  data modeling,  ODMG-93,  OMEGA,  

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This paper discusses an object-oriented approach to temporal multimedia data modeling in OMEGA; a multimedia database management under development at the University of Library and Information Science. An object-orientated approach is necessary to integrate various types of heterogeneous multimedia data, but it has become clear that current object-oriented data models are not sufficient to represent multimedia data, particularly when they are temporal. For instance, the current object-oriented data models cannot describe objects whose attribute values change time-dependently. Also, they cannot represent temporal relationships among temporal multimedia objects. We characterize temporal objects as instances of a subclass of class TimeInterval with the temporal attributes and the temporal relationships. This temporal multimedia data model is designed upward compatible with the ODMG-93 standard object model. To organize a temporal multimedia database, a five temporal axes model for representing temporal multimedia objects is also introduced. The five temporal axes--an absolute, an internal, a quasi-, a physical, and a presentation time axis--are necessary to describe time-dependent properties of multimedia objects in modeling, implementing and use. A concrete example of this organization method is also illustrated.