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The Role of Video in Remote Instrumentation

This paper explores the role of video in remote instrumentation, focusing on data collection, telepresence, and telecollaboration. It discusses the requirements and recommendations for each function and highlights the critical factors in designing video instruments under bandwidth constraints. Contact Erik C. Hofer for more information.

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The Role of Video in Remote Instrumentation

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  1. The Role of Video in Remote Instrumentation Erik C. Hofer School of Information University of Michigan

  2. Some context • Member of the Collaboratory for Research on Electronic Work (CREW) • Work on a number of collaboratory projects • George E. Brown Network for Earthquake Engineering Simulation (NEES) • www.nees.org, www.neesgrid.org • NSF CMS-0117853 • Science of Collaboratories • www.scienceofcollaboratories.org • NSF IIS-0085951

  3. Collaboratory definition • Distributed facilities for doing science • Term coined in 1989 by W. Wulf • “..center without walls..” • 1993 NRC Report on National Collaboratories • Oceanography • Space Physics • Molecular Biology • Many collaboratory initiatives • NSF, DOE, NIH, etc.

  4. Collaboratory people-to-people Communication, Groupware Services access to information access to facilities Distributed, media-rich information technology Interaction with the Physical World Digital Libraries, E-Pub

  5. Video as remote instrument • In collaboratories, heavily involved parties may be completely remote • Separated from instruments • Separated from support staff • Separated from collaborators • Rich communications media are needed to facilitate their participation

  6. Three functions • Data collection • Telepresence • Telecollaboration

  7. Data collection • Scenario: Capture audio and video of crack propagation to analyze in conjunction with sensor data. • Requirements • High picture quality • High frame rate • Does not need to be available in real time at other sites • Recommendation • Use uncompressed DV video • Capture locally, send to archive

  8. Telepresence • Scenario: Multiple remote observers need to watch an experiment. • Requirements • Efficient bandwidth usage • Low latency • Multiple platforms / Thin client • Recommendation • MJPEG streaming system (N. Zaluzec)

  9. Telecollaboration • Scenario: A remote PI needs to monitor an experiment and converse frequently with support staff and on-site collaborators. • Requirements • Low latency • High interactivity • Recommendation • H.323 Video Conferencing

  10. Critical factors

  11. Translating needs into design • Under bandwidth constraints, need to maximize important factors • Consider strengths of various algorithms • Raw DV • MJPEG • H.323 / H.26x

  12. Conclusion • Video is an essential component of remote instrumentation • Communicates information that is not easily instrumented • Not all video is the same - consider the use • Optimize a video instrument based on the factors that matter

  13. Contact • Erik C. Hofer • ehofer@umich.edu • www.crew.umich.edu • www.neesgrid.org • www.scienceofcollaboratories.org

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