Keynote Speakers

The following experts have agreed to deliver keynote talks at PV 2012.

Zoomable Video

Bernd Girod, Stanford University

We review recent advances in the technology and applications of interactive region-of-interest (IRoI) video streaming, which allows each user to interactively control pan, tilt, and zoom during playback. This is familiar for high-resolution stills (say satellite imagery and maps), but not yet ubiquitous for video. A high-resolution video is available at the source, but either bandwidth or display size prohibits the streaming of the full video to a desktop computer, tablet, or smartphone. Solutions can be built in a standards compliant manner by breaking up the video into tiles at different resolution levels and simultaneously streaming multiple sub-videos that make up the overall display. Over-the-top delivery can use a client-server model or, for live multicast to large audiences, a P2P overlay. I will report our experiences with ClassX, an experimental IRoI video streaming platform for capturing lectures and seminars at Stanford University. In addition to "zoomable video," the system implements sophisticated video analysis techniques for automatic tracking of the lecturer and automatic synchronization of digital presentation slides, thus eliminating most human intervention for producing a compelling interactive viewing experience and reducing cost dramatically. ClassX works with Silverlight, Flash, iOS, and Android clients and is available as open source software at


Measuring others' media experience

Alexander Raake, Deutsche Telekom Labs/TU Berlin

The talk will provide an overview of recent research and standardization activities on audiovisual quality assessment for IP-based multimedia services. It describes packet-header- and bitstream-based as well as hybrid models with access to the user's media player output, and their application to monitoring multimedia Quality of Experience (QoE). But what is QoE, really? Technical as well as principal challenges of multimedia QoE assessment, modeling and monitoring are discussed in the light of human multimodal perception in an entertainment usage scenario.


Social Mobile Clouds

Frank Fitzek, Aalborg University

This talk will look into the potential of user cooperation. Users may form mobile clouds in order to increase the throughput, decrease delay and energy consumption. In order to increase the willingness to cooperate in such a mobile cloud the egoistic users have to be convinced either by technology driven or socially driven factors. On the technical side network coding is one of the enablers to create new services for mobile clouds. On the social side the social networks are used to enable the cooperation. The talk will highlight some potential use cases such as video distribution in mobile clouds.


Challenges and benefits of diverse IP distribution systems for a major broadcaster

George Wright, BBC Research

The BBC is a major UK Public Sector Broadcaster that operates ten TV channels and >50 radio networks. We deliver our content to viewers and listeners over broadcast and IP networks. Massive scale IP delivery gives a number of challenges as well as many benefits. This talk details some of the R&D input into IP delivery, shares some of the problems we face, and discusses scenarios and approaches which we are examining to continue our experimentation into modern delivery systems whilst maintaining a legacy broadcast network and an integral approach to high quality and open standards.