Interactive free viewpoint video streaming using prioritized network coding

In free viewpoint applications, the images are captured by an array of cameras that acquire a scene of interest from different perspectives. Any intermediate viewpoint not included in the camera array can be virtually synthesized by the decoder, at a quality that depends on the distance between the virtual view and the camera views available at decoder. Hence, it is beneficial for any user to receive camera views that are close to each other for synthesis. This is however not always feasible in bandwidth-limited overlay networks, where every node may ask for different camera views. In this work, we propose an optimized delivery strategy for free viewpoint streaming over overlay networks. We introduce the concept of layered quality-of-experience (QoE), which describes the level of interactivity offered to clients. Based on these levels of QoE, camera views are organized into layered subsets. These subsets are then delivered to clients through a prioritized network coding streaming scheme, which accommodates for the network and clients heterogeneity and effectively exploit the resources of the overlay network. Simulation results show that, in a scenario with limited bandwidth or channel reliability, the proposed method outperforms baseline network coding approaches, where the different levels of QoE are not taken into account in the delivery strategy optimization.

Bild und Geste. Figurationen des Denkens in Philosophie und Kunst

Die Geste ist akademisch en vogue. Über Rhetorik und Kommunikationswissenschaften hinaus zeigt sie sich längst auch in Bildforschung, Medienphilosophie, Tanzwissenschaft oder Entwurfstheorie. Diese Konjunktur beweist vor allem eines: dass das Denken des Gestischen über die bloße Orientierung am menschlichen Körper weit hinausreicht, dass es Prozesse beschreibt statt konventionelle Zeichen – und letztlich als strukturgebendes Moment menschlicher Weltverhältnisse verstanden werden kann. Die in diesem Band versammelten Beiträge situieren die Geste daher im Zentrum der Genese theoretischer und künstlerischer Hervorbringungen: Das Phänomen wird zur Denkfigur.