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The Access Grid at Vislab

The Access Grid at Vislab

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The Access Grid at Vislab

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  1. The Access Grid at Vislab Chris Willing chris@vislab.usyd.edu.au Vislab University of Sydney, Australia.

  2. Today • Background • Differences to “traditional” vc • Vislab Implementation – ATP • Vislab Implementation – Physics • Virtual Venues • Differences to ANL implementation • Future Work

  3. Background • VISLAB – visualisation, high perf. Computing • Labs at Physics, ATP • Bernard Pailthorpe at SDSC in 2000 • High resolution displays • AG node • Start April 2001 for SCGlobal, November 2001

  4. Hyogo Prefecture (Japan) Police Command Center - reference site Tiled rear projection array of 6 Model 200 ILA Projectors

  5. Courtesy of Pat Hanrahan, CS - Stanford SmartSpaces, Stanford

  6. Courtesy of Kai Li, CS - Princeton PowerWall, Princeton 8x commodity projectors

  7. High Density Tiled Display, SDSC http://vis.sdsc.edu/research/tileddisplay.html 3x3 array with common light source

  8. (Background) • VISLAB – visualisation, high perf. Computing • Labs at Physics, ATP • Bernard Pailthorpe at SDSC in 2000 • High resolution displays • AG node • Start April 2001 for SCGlobal, November 2001

  9. Display, VisLab 2001 3x1 array, 3840x1024 pixels, single light source

  10. Application in archaeology: Angkor

  11. (Today) • Background • Differences to “traditional” vc • Vislab Implementation – ATP • Vislab Implementation – Physics • Virtual Venues • Differences to ANL implementation • Future Work

  12. Differences – 1. traditional • Each node sends image stream(s) to MCU which decides what is output to each node • TV style MCU

  13. Differences – 2. access grid • Each node sends image streams to a multicast group address • Each node sees all other sources

  14. but if “Each node sees all other sources” then screen overload e.g. 10 other sites, each with 3 cameras => 30 video streams

  15. Normal screen First Access Grid session at USyd on 29 Aug, 2001

  16. Widescreen 5120x1024 Normal screen 1280x1024

  17. Summary of Differences • limited vs. rich user experience • complex (studio) vs. simple (pc) • proprietary vs. open • expensive vs. cheap • but richness requires pixels

  18. Technology diversion 1 Unicast 3 streams to 7 sites = 21 video streams

  19. Efficient but who pays? Multicast 3 streams to 7 sites = 3 streams (mostly)

  20. Today • Background • Differences to “traditional” vc • Vislab Implementation – ATP • Vislab Implementation – Physics • Virtual Venues • Differences to ANL implementation • Future Work

  21. Vislab Implementation (ATP) display projectors (monitor) video cameras audio mics Gentner PA

  22. Access Grid Sydney Preparing forSC-Global: test “cruises” + A/G-Sydney

  23. ATP display Projected display 3840x1024 Mon. display network

  24. mon. ATP video capture screen camera table video network projectors

  25. 1x Radio mic 2x PZM Rx mon. PA Gentner audio network ATP audio capture

  26. Site A Site B Gentner – echo control echo delay due to - distance - application buffering

  27. Projected display 2560x1024 2x cameras Mon. 1x video Polycom Soundstation network Vislab Implementation (Physics)

  28. Virtual Venues • ANL runs Virtual Venues Server • APAG server at http://venues.ap-accessgrid.org • Virtual rooms characterised by facilities • Video multicast group address • Audio multicast group address • MUD location (back channel link for participants)

  29. Differences to ANL • Linux only • stability • sync with vvd (not CORBA event handler) • potential for compute clustering (openMosix) • Graphics cards (nVidia Quadro4) • use “well known” visualisation apps e.g. performer, openInventor, openDX • potential for video clustering (chromium)

  30. monitor projectors display cameras 1 video 2 audio 3 mics Gentner PA Video clustered AG

  31. Performer with AG

  32. High Resolution with AG

  33. Future • Video clustering, stereo viewing • Shared event stream • Higher resolution (PAL, HDTV) • H263, hardware MJPEG • External machine capture • Coexistence with H323 (via VRVS)

  34. Links http://www.vislab.usyd.edu.au/research/accessgrid/ http://www.vislab.usyd.edu.au/research/display/ http://www.accessgrid.org http://www.scglobal.org http://vis.sdsc.edu/research/tileddisplay.html