Jens Grubert delivered the presentation on September 29th, 2012 during the 14th edition of MobileHCI, International Conference on Human-Computer Interaction with Mobile Devices and Services in San Francisco, California, USA. ABSTRACT: Magic lens and static peephole interfaces are used in numerous consumer mobile phone applications such as Augmented Reality browsers, games or digital map applications in a variety of contexts including public spaces. Interface performance has been evaluated for various interaction tasks involving spatial relationships in a scene. However, interface usage outside laboratory conditions has not been considered in depth in the evaluation of these interfaces. We present findings about the usage of magic lens and static peephole interfaces for playing a find-and-select game in a public space and report on the reactions of the public audience to participants‟ interactions. Contrary to our expectations participants favored the magic lens over a static peephole interface despite tracking errors, fatigue and potentially conspicuous gestures. Most passersby did not pay attention to the participants and vice versa. A comparative laboratory experiment revealed only few differences in system usage.

1. Playing it Real: Magic Lens and Static Peephole Interfaces for
Games in a Public Space
Jens Grubert1, Helmut Munz, Ann Morrison2, Gerhard Reitmayr1
1Institute for Computer Graphics and Vision, Graz University of Technology
2Department of Architecture, Design and Media Technology, Aalborg University

2. Goals
 Picture of smartphone interaction at pt stop
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3. (How) do individuals use a
Magic Lens interface in
public space if they can use an
established interface?
3 Jens Grubert | grubert@icg.tugraz.at

4. Research Questions
(How) do individuals use a Magic Lens interface in
public space if they can use an established interface?
Magic Lens Static Peephole
Interfaces can be switched at any time.
Which interface would be used longer?
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5. Research Questions
(How) do individuals use a Magic Lens interface in
public space if they can use an established interface?
Reactions from passers‐by?
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6. Research Questions
(How) do individuals use a Magic Lens interface in
public space if they can use an established interface?
Differences in usage between public space and laboratory?
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7. Study Design
 Quantitative and qualitative methods
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8. Study Design
 Quantitative and qualitative methods
 Between‐subjects design
 IV: public space, laboratory
 DV: usage time of interface
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9. Study Design
 Quantitative and qualitative methods
 Between‐subjects design
 IV: public space, laboratory
 DV: usage time of interfaces
 Video‐recording and coding, semi‐structured interviews
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10. Study Design
 find and select game
in front of A0 poster
 free choice of interface
 switching possible at any time
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11. Magic Lens
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12. Static Peephole
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13. switching interfaces
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14. Participants
 16 participants (8 female, 8male), 21‐30 years
 Design, IT, social science background
 Mostly non‐gamers, had contact with AR before
Procedure
Intro Training Game Interviews Performance
15 targets x 8 levels (15-20 min)
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16. Data Collection
 Video‐recording for main phase (2 hours per location)
 Questionnaires
 Device logging
 usage times
 tracking data
 touch events
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17. Hypotheses
H1: ML will be used less often in the public
setting than in the laboratory
H2: ML will be used less as the game progresses
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18. Findings
ML was used most of the time (76% in public, 68% in lab)
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19. Findings
H1: ML will be used less often in the public
setting than in the laboratory
H2: ML will be used less as the game progresses
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20. Findings
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21. Findings
H1: ML will be used less often in the public
setting than in the laboratory
H2: ML will be used less as the game progresses
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22. Participants used Magic Lens more
 Enjoyment “you are much more in the game”
 Novelty “I wanted to try out
Augmented Reality [ML], as I
can use the map [SP] view all
the time”.
 Overview
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23. Participants used Static Peephole ...
 When tracking failed
 Speed
 Fatigue
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24. Public Reactions
691 people passing by
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25. Public Reactions
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26. Public Reactions
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27. Public Reactions
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28. Public Reactions
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29. Usage beyond Study
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30. (How) do individuals use a
Magic Lens interface in
public space if they can use an
established interface?
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31. Summary
 Magic Lens used more
 Interfaces combined for various reasons
 Most passers‐by did not notice
 No differences in usage between public space ‐ lab
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32. Future Directions
 Less obtrusive
evaluation methodologies
 Longer usage times
 Different tasks
 More usage contexts
 Malls
 Public transportation
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33. Thank you
Questions?
This work was supported by the Austrian National
Research Funding Agency (FFG) in the SmartReality project.
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