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Amsterdam-Zuidoost, Netherlands

Nemcova J.,CWI Centrum Wiskunde and Informatica
2009 European Control Conference, ECC 2009 | Year: 2015

The concept of algebraic reachability refers to the property of a system that every state from a sufficiently big subset of a state-space can be reached from a given inital state by applying an admissible input to the system. In this paper we study algebraic reachability of rational systems. We provide necessary and sufficient conditions for a rational system to be algebraically reachable (from an initial state). These conditions are formulated in terms of ideals of polynomials which makes checking algebraic reachability of a system computationally feasible. We relate the notion of algebraic reachability to the notion of controllability of linear systems, (local and local strong) accessibility and controllability of nonlinear systems. © 2009 EUCA. Source

Bonastre O.M.,University Miguel Hernandez | Montpetit M.-J.,Massachusetts Institute of Technology | Cesar P.,CWI Centrum Wiskunde and Informatica
Multimedia Tools and Applications | Year: 2011

The move to IP Protocol Television (IPTV) has challenged the traditional television industry by opening the Internet to high quality real time television content delivery. Thus it has provided an enabling set of key technologies to understand and foster further innovations in the multimedia landscape and to create dynamics in the TV value chain. This editorial provides a brief overview of this special issue. It begins with a short introduction to IPTV Technology and then summarizes the main contributions of the selected papers for this special issue, highlighting their salient features and novel results. © 2010 Springer Science+Business Media, LLC. Source

Jansen J.,CWI Centrum Wiskunde and Informatica
MM 2014 - Proceedings of the 2014 ACM Conference on Multimedia | Year: 2014

When using a videoconferencing system there will always be a delay from sender to receiver. Such delays affect human communication, and therefore knowing the delay is a major factor in judging the expected quality of experience of the conferencing system. Additionally, for implementors, tuning the system to reduce delay requires an ability to effectively and easily gather delay metrics on a potentially wide range of settings. In order to support this process, we make available a system called videoLat. VideoLat provides an innovative approach to understand glass-toglass video delays and speaker-to-microphone audio delays. VideoLat can be used as-is to do audio and video roundtrip delays of black box systems, but by making it available as open source we want to enable people to extend and modify it for different scenarios, such as measuring one-way delays or delay of camera switching. Source

Cesar P.,CWI Centrum Wiskunde and Informatica | Cesar P.,Technical University of Delft
Communications in Computer and Information Science | Year: 2016

Several years ago, first conceptualizations of the usages of the secondary screen in the television environment were proposed. At the time, the real challenge was to convince stakeholders that interactivity was not a threat, but an opportunity. Ten years later, the mass adoption of smaller devices has reshaped the media landscape, truly enabling interactivity while consuming media content at home. What was perceived as hindering the user experience - the second screen - has resulted into an essential companion to the television. Paradoxically, even though key players are investing on secondary screen applications, there are very few successful examples. In this paper we provide an overview of the present state of the art through representative examples and discuss future possibilities and challenges. In particular, we will focus on the importance of immersion, taking into account the surrounding of the users, and of sociability, involving her social network. © Springer International Publishing Switzerland 2016. Source

Laiola Guimaraes R.,CWI Centrum Wiskunde and Informatica
MM'10 - Proceedings of the ACM Multimedia 2010 International Conference | Year: 2010

This thesis aims to analyze, model, and develop a framework for next-generation multimedia authoring tools targeted to end-users. In particular, I concentrate on the combination of automatic and manual processes for the realization of such framework. My contributions are realized in the context of a pan-European project called Together Anywhere, Together Anytime (TA2). More specifically in a community-sharing environment in which users can combine video assets contributed by other community members to form personalized mini-stories that can be shared within their (probably restricted) social groups. The expected outcome of my thesis work is contributing for the design of authoring and sharing tools that better fit end-users' needs. Source

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