c ○ Rinton Press CONTENT ADAPTATION BASED APPROACH FOR UBIQUITOUS MULTIMEDIA

Content adaptation is playing an important role in ubiquitous multimedia, however it is a challenging work due to the high degree of dynamism and heterogeneity of the ubiquitous computing environments, where hundreds of devices provide information, and thousands of terminals access these information. Recently, some researchers proposed to address this issue by dynamically organizing services or components into customized applications at runtime. However, due to the maintenance of the dependencies between services or components, this kind of system becomes more complicated with the growth of the system scale. Programming for these systems is also error-prone. This paper discusses the issues of content adaptation based approach for ubiquitous multimedia, and presents a prototype system, called UbiCon system. By abstracting media streams into generic CONTENT entities, the system provides a simple and powerful means for services to operate media stream. The CONTENT is dynamically created by the system at runtime, and essentially has local association with related services. As a result, the CONTENT is also used as a loosely coupling method for cooperating associated services. By abstracting services with a T model, the services can effectively cooperate together with other services. As a result, a collection of sophisticated applications can be built with this simple and effective services model