View management in multimedia databases

Abstract

Though there has been extensive work on multimedia databases in the last few years, there is no prevailing notion of a multimedia view, nor there are techniques to create, manage, and maintain such views. Visualizing the results of a dynamic multimedia query or materializing a dynamic multimedia view corresponds to assembling and delivering an interactive multimedia presentation in accordance with the visualization specifications. In this paper, we suggest that a non-interactive multimedia presentation is a set of virtual objects with associated spatial and temporal presentation constraints. A virtual object is either an object, or the result of a query. As queries may have different answers at different points in time, scheduling the presentation of such objects is nontrivial. We then develop a probabilistic model of interactive multimedia presentations, extending the non-interactive model described earlier. We also develop a probabilistic model of interactive visualization where the probabilities reflect the user profiles, or the likelihood of certain user interactions. Based on this probabilistic model, we develop three utility-theoretic based types of prefetching algorithms that anticipate how users will interact with the presentation. These prefetching algorithms allow efficient visualization of the query results in accordance with the underlying specification. We have built a prototype system that incorporates these algorithms. We report on the results of experiments conducted on top of this implementation.

Multimedia Presentation Databases

“…Later, Candan et al [7,8] extended the framework of Buchanan and Zellweger by describing a multimedia presentation as a set of media objects together with a very rich, but polynomially computable set of spatial and temporal constraints defining their presentation. They also showed how to help a presentation author identify when their presentation specifications were inconsistent and to minimally modify the presentation constraints so that consistency was restored.…”

Multimedia Database Applications: Issues and Concerns for Classroom Teaching

“…Candan, Lemar & Subrahmanian [11] stated that multimedia objects have temporal and spatial aspects that do not exist in more traditional data objects; therefore, visualization of the results of a multimedia query requires specification of the visualization parameters along with the query. Some of the multimedia databases are searchable with search engines on their own website; some offer data files that teachers may download to their own computers.…”