•   When: Friday, April 06, 2018 from 10:00 AM to 11:00 AM
•   Speakers: Klara Nahrstedt, University of Illinois, Urbana-Champaign
•   Location: Research Hall 163
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Abstract:

Multi-camera environments, producing 360 view video content, are becoming an integral part of our world, if it is watching in real-time broadcasting sports or dance performance, or watching on-demand panoramic video streaming for VR applications. In this talk, we will discuss large scale content distribution networks that need to support dissemination of 360 view video content from multi-camera environments in the future. We will discuss two dissemination systems for live broadcasting of multi-view/multi-stream content that we have worked on.

The first system, called 4D Telecast, supports distribution and delivery of multi-view content to viewers who want to dynamically and concurrently change any views of a live multi-view video content. We will take view semantics into account and present a multi-stream overlay construction framework that aims to minimize cost of distribution of multi-stream content and maximize the number of concurrent viewers with efficient viewer dynamism in terms of their resources and availabilities.

The second system, called 3DTI Amphitheater, supports multi-view broadcasting as well, but it mimics an amphitheater in the real-world. It means, every viewer gets assigned a “virtual seat” and viewer can select views from her seat, related to a performer. With this approach we can support a large number of viewers. However, to deal with the high bandwidth demand and strict latency bound of the multi-view broadcasting service, we use the concept of hierarchical priorities of streams in the overlay construction of content dissemination forest. These priorities encompass merging view priority from viewer’s virtual seat and performer’s role priority important to the viewer. Our results show that taking semantic relations between viewer and her performer, in addition to view/seat semantics, becomes of great importance when constructing and configuring efficient large scale multi-site content distribution networks serving live multi-view content to large audience .

Joint work with Dr. Ahsan Arefin, Dr. Shannon Chen, Zhenhuan Gao, Dr. Indranil Gupta, Dr. Zixia Huang

Short Bio:

Klara Nahrstedt is the Ralph and Catherine Fisher Professor in the Computer Science Department, and Director of the Coordinated Science Laboratory in the College of Engineering at the University of Illinois at Urbana-Champaign. Her research interests are directed toward 3D teleimmersive systems, multimedia distributed systems, Quality of Service (QoS) and resource management, Quality of Experience in multimedia systems, and real-time security in mission-critical systems such as trustworthy power grid. She is the co-author of widely used multimedia books `Multimedia: Computing, Communications and Applications' published by Prentice Hall, and ‘Multimedia Systems’ published by Springer Verlag. She is the recipient of the IEEE Communication Society Leonard Abraham Award for Research Achievements, University Scholar, Humboldt Award, IEEE Computer Society Technical Achievement Award, ACM SIGMM Technical Achievement Award, and the former chair of the ACM Special Interest Group in Multimedia. She was the general chair of ACM Multimedia 2006, general chair of ACM NOSSDAV 2007 and the general chair of IEEE Percom 2009. She is the program co-chair of IEEE IoTDI 2018 conference and program co-chair of IEEE PerSysT 2018 workshop.

Klara Nahrstedt received her Diploma in Mathematics from Humboldt University, Berlin, Germany in numerical analysis in 1985. In 1995 she received her PhD from the University of Pennsylvania in the Department of Computer and Information Science. She is ACM Fellow, IEEE Fellow, and Member of the Leopoldina German National Academy of Sciences.