Cristina Emilia Costa

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Fine granular scalability is a coding tool, recently introduced in the emerging MPEG-4 standard, which enables the creation of very flexible scalable video bitstreams. This paper investigates the transmission of fine granular scalable (FGS) video over wireless links, using power management for unequal error protection of the bitstream. In wireless systems,(More)
In this paper the problem of transmitting embedded bitstreams over wireless packet networks is considered. In particular, the authors address the problem of joint usage of power control and forward error correction for optimizing video streams delivery, and analyze the performance in different scenarios. Experimental results, obtained for the transmission(More)
Cross-layering is a design paradigm for overcoming the limitations deriving from the ISO/OSI layering principle, thus improving the performance of communications in specific scenarios, such as wireless multimedia communications. However, most available solutions are based on empirical considerations, and do not provide a theoretical background supporting(More)
Video transmission over wireless links is becoming an interesting issue in modern communication networks. The paper presents a framework for modeling and providing an optimal solution to the problem of power control in transmission of embedded video over a single Wi-Fi link. The approach, based on a constrained optimization problem, is then compared with(More)
Now more than ever users are central to media: as creators, as consumers, as learners, etc. “User Centric Media” is an field that has been constantly increasing, and involves various areas of research. It implies taking into account the intrinsic user-centered nature of the media, at different levels of different media value chains. This perspective puts(More)
This paper discusses the role of interaction and user experience in the design of an interface of search for digital libraries. We present our preliminary work in the design of an advanced interaction interface for “Pubblicamente”, a web based semantic multimedia digital library that allows the archiving, management and access to a collection of(More)
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