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The dynamic and varying wireless channel makes it a challenge to efficiently delivery media contents over wireless with quality guarantee. We propose a multi-description scheme for the adaptive delivery of media contents over wireless. A video segment is abstracted at different levels, such as syntactic and semantic description by feature extraction and keywords annotation, video abstract by key frames...
In this paper, based on the media adaptation framework and relations among entities in MPEG-21 DIA, two mixed-variable constrained optimization models are proposed, which unify current researches in media adaptation and can be solved by the direct searches. An overview on our work in media adaptation such as rate adaptation of MPEG-4 FGS video, video objects adaptation, etc., are given. Open issues...
The wireless mobile nodes are self-powered and energy-sensitive. It is critical to prevent rapid energy dissipation while streaming high quality video over wireless. We investigate the energy consumption mode of mobile nodes and propose an energy-aware scheme for efficient streaming of MPEG-4 FGS video over multiple paths in wireless. We calculate the decoding aptitude of each FGS-coded frame before...
This paper addresses the issue of proxy-based data placement for mobile applications. The key idea is to use aggregated information about mobile users and their data request patterns to determine when, how frequently and how much data to be replicated on proxies. Specifically, we introduce a novel representation, mobile data overlay (MDO) that captures aggregated mobile data access patterns. The underlying...
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