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In this paper we detail why we think there is no satisfactory multimedia system for mobile phones running Java Mobile Edition. We also explicit what are for us the main issues when designing a multimedia system dedicated to the Java platform on embedded systems and we propose a solution for implementing a fast and powerful multimedia player, based on the 2D part of MPEG-4 BIFS and including ECMAScript support. Then we describe our J2ME implementation and how its functionality and performances can be used to create an innovative TV service. Finally, we introduce some ways of improvement with 3D support and basic augmented reality functionality. INTRODUCTIONThere are very few rich media systems adapted to the mobile platform compared to what is offered in the PC world. At the same time, both the screen size and the CPU power of mobile phones are increasing regularly, despite limitations due to form factor and battery. Thus, a growing number of phone models in the mid range prices have a QVGA screen and a pretty fast processor, allowing in theory to display graphical animations with complex animations that should be much closer to WEB 2.0 applications than WAP pages. However, the kind of programs that can run on mobile devices highly depends on the platform type.

A reef called ''Les Hermelles'' occurs in the intertidal zone of the Bay of Mont Saint-Michel (Normandy, France). The reef is composed of the sea-worm Sabellaria alveolata and thus, is one of the northernmost biological reefs in the world. To map Les Hermelles in the fi eld is diffi cult because of its great distance from the coastline and its brief exposure to the air. Consequently, the last map dates back to 1980. In 1984, mussel farms were developed around the reef. Since then, they are often regarded as the factor responsible for the perceived decline of the reef. The main goal of the study was to assess the possibility of mapping Les Hermelles using satellite imagery and if so, to give a rough idea about its recent evolution since the 1980 map. A multi-spectral SPOT image satellite was used for the tests. Areas of reef, sand, silt, mud and sea-water show similar spectral signatures. Moreover, these environments are often mixed within a single pixel. Consequently visual interpretation and the usual classifi cation approaches failed, showing interclass confusion. A new classification based on cellular automata appears to be promising. Applied to the example of Les Hermelles, this method was successful and showed a certain stability of the reef dynamic tendencies since 1980. Although the preliminary results have to be securely based on field data acquired close to the satellite-image date, they already confi rm the key role that sandbars play in the reef dynamics whereas the role of the mussel farms remains unclear if not null. The classification by cellular automata presents the advantage that no supervision is required, and that spectral and geographical information are both used together.

Mobile terminals such as smartphones and PDA are able to produce picture, audio and video contents. However, the creation and publication of a mixed content document remains quite difficult and even does not exist on mobile devices. The authoring motivates our work. In this paper we will describe a framework based on richmedia templates to assist users during all stages of a complex content production from expert user to end user. By complex content we mean mixing videos, texts, audio, pictures in a time-dependant document 1 [4]. The richmedia language we have selected is MPEG-4 BIFS (BInary Format for Scenes)[3] for its high level integration of many media type and streaming capabilities which is decisive in a mobility context.