5 – Multimedia Systems and Signal Processing

Universal multimedia access (UMA) is emerging as one of the important applications for the next generation of multimedia systems. The basic concept of UMA is the adaptation, summarization, and personalization of multimedia content according to usage environment. This chapter describes UMA, in particular, it describes how different multimedia systems and signal processing tools use MPEG-7 and MPEG-21 for enabling UMA. It also discusses describes the MPEG-7 support for UMA, which includes transcoding hints and variations descriptions. The different dimensions for adaptation include rate and quality reduction, adaptive spatial and temporal sampling, and semantic summarization of the multimedia content. The different relevant dimensions of the user environment include device capabilities, bandwidth, user preferences, usage context, and spatial and temporal awareness. UMA facilitates the scalable or adaptive delivery of multi-media to users and terminals regardless of bandwidth or capabilities of terminal devices and their support for media formats. In addition, UMA allows the content to be customized for users at a high-semantic level through summarization and personalization according to user preferences and usage context.

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