1. Transitioning from Implicit to Explicit, Public to Personal, Interaction with Multiple Users Daniel Vogel, Ravin Balakrishnan Department of Computer Science University of Toronto Interactive Public Ambient Displays :

2. Why do we need a interactive public display? Information exchanging A dream of ubiquitous computing – A gateway to access our personal information

3. How? Challenges Public: attention – Not overloading users’ senses – Minimally intrusive Personal: privacy Sharing interaction

4. Bringing people from public to personal Streitz, et al., 2003 Vogel, et al., 2004

5. Design Principles and Interaction Framework Goal: seamlessly, fluidly implicit  explicit Public  personal Solve the dilemma of dual role Solution: user’s attention (location and orientation) to the display and relationship between available information type and user’s phase

6. Hardware and layout From top to bottom: weather, office activity, calendar, and messaging 50” plasma screen with toch-sensitive overlay Vicon for tracking

7. Ambient Display Phase able to get a sense of the overall information space with a quick glance Calm aesthetics, shared use, comprehension and Immediate Usability Tech: text labels

8. Implicit Interaction Phase Calm aesthetics and notification Tech: vertical bar – :appearance (location) – width (body orientation) – opacity (head orientation) Notification Flag

9. Subtle Interaction Phase I (Overview) Distance < 40” Why Shared use and Immediate Usability

10. Subtle Interaction Phase II (Select)

11. Personal Interaction Phase

12. Transition

13. Informal User Study four participants work in an office environment, and were fluent with various computational media Our evaluation had two parts. First – Method: talk-aloud – how they explore their movements influenced the display and their interpretation – glove with markers for hand tracking was not used in the first part of the evaluation Second – the gestures performance, gesture hint icons effectiveness, timeline navigation, and the phase of touch-screen initiation – did not implement help sequences

14. Summary Fluid movement between phases Techniques for multiple users Subtle notification Privacy controls Self-revealing help Implicit interaction was enabled by sensing contextual cues such as body orientation and position, and user proximity to the display. Hand gestures and touch screen input support explicit interaction.

15. Conclusion a new style of interactive public ambient display combining peripheral notification with implicit and explicit interaction for accessing both public and personal information Initial user feedback indicates that our techniques are quickly discoverable and appear to be usable. A set of design principles and an interaction framework that fluidly moves from implicit interaction with a public ambient peripheral display to explicit interaction Taking us a step closer to realizing more sophisticated and useful sharable, interactive, public ambient displays.

16. yov Perception and Usage of Interactive Displays (Source: Daniel Michelis (2009), according to: Brignull & Rogers, 2003)