Jean-Claude Dufourd

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From multimedia history, we can see that however powerful the technologies underlying multimedia systems, only relevant authoring applications will bring success to these systems. From this assumption MPEG-Pro, a first MPEG-4 authoring system prototype has been designed to integrate all main authoring capabilities from Audio/Visual encoding to the final(More)
In this paper, we present our work on two aspects of multimedia adaptation: knowledge-based single media adaptation and semantic adaptation of multimedia documents. For the former, we propose support of adaptation by direct hinting in the scope of MPEG-21. For the latter, which is the main part of the presented work, we introduce the description of semantic(More)
—Our work focuses on the encoding of two–dimen-sional (2-D) graphics animated cartoons with MPEG-4. This stems from a need to stop encoding cartoons as videos and to start using methods more adapted to animated 2-D vector graphics sequences. We expected this could be an efficient coding with good versatility for various types of terminals. First, we present(More)
In this paper, we present our work on context-aware semantic adaptation of multimedia structured documents. We propose semantic annotation of multimedia scenes, expressing semantic information on each media object, as well as on the dependencies between all the media objects of the scene. We use these annotations in order to perform a semantic adaptation on(More)
As the newly created standard for interactive television, HbbTV (for Hybrid broadband broadcast TV), is getting traction, the problem of recording TV services takes on new dimensions with interactive and hybrid services. This paper explores the different issues raised by the recording and on-demand playback of broadcast HbbTV services containing interactive(More)
Multimedia applications are challenging software and require collaboration of very different components such as networking, rendering, or scripting to provide a nice user experience. GPAC is an open source multimedia framework that implements a vast number of components and helps experimenting with different types of multimedia applications. It provides a(More)
Creating web applications for the multiscreen environment is still a challenge. One approach is to transform existing single-screen applications but this has not been done yet automatically or generically. This paper proposes a refactoring system. It consists of a generic and extensible mapping phase that automatically analyzes the application content based(More)
Widgets are small and focused multimedia applications that can be found on desktop computers, mobile devices or even TV sets. Widgets rely on structured documents to describe their spatial, temporal and interactive behavior but also to communicate with remote data sources. However, these sources have to be known at authoring time and the communication(More)