[Παλιό] Multipoint Videoconf. with Scalable Video Coding

[Ethel]

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Ομιλητής : Α. Ελευθεριάδης
Χρόνος : Τρίτη 15-5-2007, 13.00
Τόπος : αίθουσα τηλεσυσκέψεων του κέντρου δικτύων, Τμήμα
Πληροφορικής, Πανεπιστήμιο Αθηνών

Η ομιλία θα δωθεί στα πλαίσια της προκύρηξης θέσης με αντικείμενο:

«Τεχνολογίες Υπηρεσιών Πληροφορικής και Τηλεπικοινωνιών (Με έμφαση σε Προσωπικές Επικοινωνίες, Κινητή Υπολογιστική, Πολυμεσικές Επικοινωνίες, Ενδιάμεσο Λογισμικό)».

Περίληψη:
We describe a system for multipoint videoconferencing that offers extremely low end-to-end delay, low cost and complexity, and high scalability, alongside standard features associated with high-end solutions such as rate matching and personal video layout. The system accommodates heterogeneous receivers and networks based on the Internet Protocol. It relies on scalable video coding to provide a coded representation of a source video signal at multiple temporal and spatial resolutions as well as quality levels. These are represented by distinct bitstream components which are created at each end-user encoder. Depending on the specific conferencing environment, some or all of these components are transmitted to a Scalable Video Conferencing Server (SVCS), which in turn redirects them to one or more recipients depending on, e.g., the available network conditions and user preferences. The scalable aspect of the video coding technique allows the system to adapt to different network conditions, and also accommodates different end-user requirements (e.g., a user may elect to view another user at a high or low spatial resolution). Performance results concerning flexibility, video quality and delay of the system are presented using the Joint Scalable Video Model (JSVM) of the forthcoming SVC (H.264 Annex G) standard, demonstrating that scalable coding outperforms existing state-of-the-art systems and offers the right platform for building next-generation multipoint videoconferencing systems.