Publications (8)0.73 Total impact
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Article: Events in Interactive Multimedia Applications: Modeling and Implementation Design
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ABSTRACT: A variety of approaches and standards to model multimedia presentations have been proposed. The `interactivity' of these models is often lacking or unsatisfactory. Interactions, however, form an essential part of an Interactive Multimedia Application (IMAP) and need to be reflected in the modeling and presentation of multimedia scenarios. A complex modeling of interaction elements must cover all possible interactions between a user and a computer as well as those interactions between entities within the computer. In this paper, we introduce the notion of events as they are a promising approach for modeling the various interaction elements in IMAPs. We elaborate on an event classification scheme and according to this, an objectoriented model for the different types of events in IMAPs. We also propose a rich composition scheme to allow for the definition of complex interactions. We also present the design of a multimedia DBMS client that manages IMAPs and implements the...09/2000; -
Article: Spatio-temporal composition and indexing for large multimedia applications
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ABSTRACT: Multimedia applications usually involve a large number of multimedia objects (texts, images, sounds, etc.). An important issue in this context is the specification of spatial and temporal relationships among these objects. In this paper we define such a model, based on a set of spatial and temporal relationships between objects participating in multimedia applications. Our work exploits existing approaches for spatial and temporal relationships. We extend these relationships in order to cover the specific requirements of multimedia applications and we integrate the results in a uniform framework for spatio-temporal composition representation. Another issue is the efficient handling of queries related to the spatio-temporal relationships among the objects during the authoring process. Such queries may be very costly and appropriate indexing schemes are needed so as to handle them efficiently. We propose efficient such schemes, based on multidimensional (spatial) data structures, for large multimedia applications that involve thousands of objects. Evaluation models of the proposed schemes are also presented, as well as hints for the selection of the most appropriate one, according to the multimedia author's requirements.Multimedia Systems 06/1998; 6(4):284-298. · 0.73 Impact Factor -
Article: Spatio-temporal Composition in Multimedia Applications
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ABSTRACT: The motivation for this research work is the lack of a complete declarative way for representative spatiotemporal composition of objects in the current multimedia document standards and authoring tools. In this paper we define such a model which is based on a set of spatial and temporal relationships between actors in multimedia applications. Our work exploits existing approaches for spatial and temporal relationships. We extend these relationships in order to cover the specific requirements of multimedia applications and we integrate the results in a uniform framework for spatiotemporal composition representation. 1. Introduction Multimedia Applications can be very complex concerning the number of involved objects (there fore "actors"), transformations of the objects in the scope of an application and relationships among them. We regard a multimedia application as a container that includes scenes (aggregations of objects in a thematic domain) which, in turn, include objects that are ...10/1997; -
Article: Spatial Decision Making Based on Fuzzy Methodologies
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ABSTRACT: At present, Geographic Information Systems (GIS) though powerful toolboxes, most with hundreds of functions, they suffer from several limitations which render them inefficient tools for spatial decision-making. This paper focuses on the inappropriate logical foundation incorporated into them and examines the necessity of adopting fuzzy logic methodologies in GIS operations. 1 INTRODUCTION Geographic Information Systems (GIS) are computer-based systems designed to support the capture, management, manipulation, analysis, modeling and display of spatially referenced data at different points in time [Aronoff, 1989]. Today, GISs are widely used in many government, business and private activities; which fall into three major categories [Maguire et al., 1991]: a) socio-economic applications (e.g., urban and regional planning, cadastrial registration, archaeology, natural resources, etc.); b) environmental applications (e.g., forestry, fire and epidemic control, etc.); and c) management appli...11/1996; -
Article: A Script Based Approach For Interactive Multimedia Applications
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ABSTRACT: This paper proposes an object oriented framework for scripting Interactive Multimedia Applications. Unlike other existing systems, the script (scenario) concept is central for the design since it handles the composition of the media objects both in spatial and temporal domains, the user interaction and system events. Moreover the proposed model incorporates an advanced scheme for complex composition in the temporal domain using a complete set of temporal operators defined in the framework. A sample application illustrates the potential of the proposed framework. 1. Introduction Multimedia presentations are evolving as a popular and demanding field since the potential of new multimedia technologies is challenging a variety of group of users. We aimed at defining an object oriented framework that abstracts the composition and synchronisation features of an Interactive Multimedia Application (IMA) and, moreover, provides the methods for the definition and execution of an interactive scen...11/1996; -
Article: Incorporating Fuzzy Logic Methodologies into GIS Operations
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ABSTRACT: . At present, Geographic Information Systems (GIS) though powerful toolboxes, most with hundreds of functions, they suffer from several limitations which render them inefficient tools for spatial decisionmaking. This paper focuses on the inappropriate logical foundation incorporated into them and examines the necessity of adopting fuzzy logic methodologies in GIS operations. 1 Introduction Geographic Information Systems (GIS) are computer-based systems designed to support the capture, management, manipulation, analysis, modeling and display of spatially referenced data at different points in time [1]. Today, GISs are widely used in many government, business and private activities; which fall into three major categories [10]: a) socio-economic applications (e.g., urban and regional planning, cadastrial registration, archaeology, natural resources, etc.); b) environmental applications (e.g., forestry, fire and epidemic control, etc.); and c) management applications (e.g., organization o...11/1996; -
Article: Spatio-Temporal Indexing for Large Multimedia Applications
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ABSTRACT: : Multimedia applications usually involve a large number of multimedia objects (texts, images, sounds etc.). Spatial and temporal relationships among these objects should be efficiently supported and retrieved within a multimedia authoring tool. In this paper we present several spatial, temporal and spatio-temporal relationships of interest and propose efficient indexing schemes, based on multi-dimensional (spatial) data structures, for large multimedia applications that involve thousands of objects. Evaluation models of the proposed schemes are also presented as well as hints for the selection of the most appropriate one, according to the multimedia author's requirements. 1. INTRODUCTION A Multimedia Application (MAP) involves a variety of individual multimedia objects presented according to the MAP scenario. The multimedia objects that participate in the MAP, called actors, are transformed either spatially or temporally in order to be presented according to author's requirements. Mor...03/1996; -
Article: Integrated Multimedia Object and Application Modelling Based on Events and Scenarios
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ABSTRACT: An important issue in multimedia information systems is the lack of an integrated model for complete representation of the multimedia objects and applications. In this paper we present an object oriented data base model that aims at representation of multimedia objects and applications. The application representation is based on composition (spatial and temporal) modelling and scenario modelling. An important feature of the proposed model is that there is an integrated modelling of the multimedia objects as well as of the applications that utilise them in a uniform way. Moreover the mappings between the two categories of classes are defined. 1. Introduction Multimedia applications are gaining importance in the software industry due to their impact on various user communities. An important part of a multimedia application is the scenario which describes the flow of the application in spatial and temporal domains as well as handling application and system events. Current authoring syste...03/1996;
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1998
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National Technical University of Athens
- Σχολή Ηλεκτρολόγων Μηχανικών & Μηχανικών Υπολογιστών
Athens, Attiki, Greece
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