page 1 06/17/22 CSE 40373/60373: Multimedia Systems CSE 4/60373: Multimedia Systems Outline for today Teleimmersive systems: Hydra, Coliseum, Teeve The goal of these systems is multi- site, multi-view collaboration
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page 104/20/23 CSE 40373/60373: Multimedia Systems
CSE 4/60373: Multimedia Systems
Outline for today Teleimmersive systems: Hydra, Coliseum, Teeve
The goal of these systems is multi-site, multi-view collaboration
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Access Grids - Argonne Laboratory
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Access Grid - Jackson State, MS
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Access Grid - CRC, ND
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I-Glass
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Demo of Hydra
Virtual symphony Each site uses HD cameras + high fidelity audio
24.2 audio?
Synchronize and play the symphony together
Watch more modest demo
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Coliseum
Tele-immersive video conferencing system Near commodity gear
(Very) powerful desktops 5 VGA cameras connected to a rig that can be attached
to the monitor. The cameras can slide out during conferences and then be stowed away
Generate a 3D representation of the user and ship it to other participants. Render them on a virtual background (which is stored locally and hence not transmitted)
Head tracking proved too computionally expensive . But it is conceivable to add them in future iterations.
About 300 ms e2e delay Network was 3 ms. Cross country around 30-40 ms delay
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Rendering
Image processing techniques Distinguish foreground from background (foreground is
image without user) Reduce contour complexity using piecewise linear
approximation Correct lens distortion Trade expensive operations for speed
Color calibration - these are cheap cameras which may or may not be in exact focus and orientation Not a trivial problem to solve
Reconstruction Motion parallax
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Systems issues
Develop software framework to build these systems This is a complex piece of code!! End-to-end performance measurements Piecewise measurement of the different components
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Video from HP Labs - from ACM-MM 03
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Teeve
Multiparty, multisite teleimmersive application Generate 3-D models of participants, send it to
remote sites using a Peer-to-peer overlay and then render them on the other end
Demo video
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