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Video-Mediated Communication. Michael Nunes CPSC 781 September 21, 2005. Primary Sources / Readings. Papers in K. Finn, A. Sellen and S. Wilbur (Eds) Video-Mediated Communications. LEA Press. 1997 Whittaker, S. and O\'Conaill, B. The Role of Vision in Face-to-Face and Mediated Communication.

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video mediated communication

Video-Mediated Communication

Michael Nunes

CPSC 781

September 21, 2005

primary sources readings
Primary Sources / Readings

Papers in K. Finn, A. Sellen and S. Wilbur (Eds) Video-Mediated Communications. LEA Press. 1997

  • Whittaker, S. and O\'Conaill, B. The Role of Vision in Face-to-Face and Mediated Communication.
  • Angiolillo, J., Blanchard, H., Israelski, E. and Mane, A. Technology Constraints of Video-Mediated Communication.
  • (optional) Isaacs, E. and Tang, J. Studying Video-Based Collaboration in Context: From Small Workgroups to Large Organizations.

4. (optional) Fish, R., Kraut, R. and Chalfonte, B. The VideoWindow System in Informal Communications. Proc. ACM CSCW\'90. 1-11. 1990

types of vmc services
Types of VMC Services
  • Video Telephone
  • Desktop Video Conferencing
  • Group Systems
  • Media Spaces and Special Purpose Systems

Desktop video chat: Macromedia

iPower Technologies Video Phone

role of vision in communication
Role of Vision In Communication

Role of vision in communication:

Why use visual information to facilitate communication?

classes of visual information
Classes of Visual Information
  • Participant Behavior
    • Gaze
    • Gesture
    • Facial Expression
    • Posture
  • Visible Environment
    • Objects and Events in the collaborative environment
    • Availability
communication framework
Communication Framework
  • Process Coordination
    • Turn-taking cues
    • Availability cues
  • Content Coordination
    • Reference
    • Feedback cues
    • Interpersonal cues
hypotheses
Hypotheses
  • Nonverbal Communication
  • Availability Information
  • Visible Environment (Video as Data)
hypothesis 1
Hypothesis #1
  • Nonverbal Communication
    • Cognitive cues for shared understanding
    • Cues to support turn-taking
    • Social cues and emotional information
hypotheses9
Hypotheses
  • Nonverbal Communication
  • Availability Information
  • Visible Environment (Video as Data)
hypothesis 2
Hypothesis #2
  • Availability Information
    • Facilitation of unplanned communication
    • Glance
      • Ex. Montage System
    • Open Link
      • Ex. VideoWindow System
hypotheses11
Hypotheses
  • Nonverbal Communication
  • Availability Information
  • Visible Environment (Video as Data)
hypothesis 3
Hypothesis #3
  • Visible Environment (Video as Data)
    • Information about shared work objects
    • Successful example: remote surgery
    • May also be useful for other design tasks
life cycle of a video call
Life Cycle of a Video Call
  • Set a call
  • Capture sights and sounds of participants
  • Process the image
  • Transmission
  • Display
set a call
Set A Call
  • Basic operation
  • Can be a barrier to participants willingness to use system
    • Spontaneity
    • System complexity
capture
Capture
  • Physical environment
  • Camera
  • Camera control
  • Hands-free communication
process the image
Process the Image
  • Transmitting sound and image is expensive!
    • 90,000,000 bps to deliver t.v. quality
  • Compression and codecs
  • Video standards and interoperability
  • Audio delay and lip sync
  • Video messaging
transmission
Transmission
  • Choice of transmission lines
    • Analog or digital
    • Wire or wireless
    • Private or public switched
  • Bandwidth is an issue for all
display
Display
  • Display size
  • Image attributes
  • Local Views
  • Eye contact/gaze awareness
  • Sound quality
  • Multipoint VMC
other problems
Other Problems
  • Technology limitations may eventually be overcome
  • Adoption of new video communication technology can not be done by a single user
  • Needs to be widespread to be useful
the end
The End!

“Eating one battery”

Questions and Discussion?

Fig. 1

“Eating five batteries”

Fig. 2

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