The University of Massachusetts Amherst
University of Massachusetts Amherst

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Seminar: Jounsup Park

"Navigation Graph for Tiled Media Streaming


Wednesday, October 16, 2019 - 4:00pm


Jounsup Park, Postdoctoral Research Associate in Coordinated Science Lab, University of Illinois at Urbana-Champaign


Marston, Room 132


"Navigation Graph for Tiled Media Streaming"


After the emergence of video streaming services, more creative and diverse multimedia content has become available, and now the capability of streaming 360-degree videos will open a new era of multimedia experiences. However, streaming these videos requires larger bandwidth and less latency than what is found in conventional video streaming systems. Rate adaptation of tiled videos and view prediction techniques are used to solve this problem. We introduce the Navigation Graph, which models viewing behaviors in the temporal (segments) and the spatial (tiles) domains to perform the rate adaptation of tiled media associated with the view prediction. The Navigation Graph allows clients to perform view prediction more easily by sharing the viewing model in the same way in which media description information is shared in DASH. It is also useful for encoding the trajectory information in the media description file, which could also allow for more efficient navigation of 360-degree videos. This talk provides information about the creation of the Navigation Graph and its uses. The Navigation Graph based view prediction and rate adaptation outperform other existing tiled media streaming solutions. Navigation Graph is not limited to 360-degree video streaming applications, but it can also be applied to other tiled media streaming systems, such as volumetric media streaming for augmented reality applications.


Jounsup Park received the B.S., and M.S. degree in electronical engineering from Korea University, Seoul, Korea. in 2006, and 2008, respectively. He received the Ph.D. degree in electrical engineering from University of Washington, Seattle, WA, USA, in 2018. From 2008 to 2012, he was with Cooperate Research Institute of Samsung Electro-Mechanics, Inc., Suwon, Korea. He is currently a Postdoctoral Research Associate in Coordinated Science Lab, University of Illinois at Urbana-Champaign, IL, USA. His research interest includes multimedia networking, wireless communication, and AR/VR quality of experience.