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Indoor positioning and navigation with camera phones

Indoor positioning and navigation with camera phones. A. Mulloni et al., Graz Univ. of Tech., IEEE Pervasive Computing , pp. 22-31, 2009. 이시혁 theshy@sclab.yonsei.ac.kr. Contents. Introduction Conference Guide Application Comparison of localization techniques Experiment Result

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Indoor positioning and navigation with camera phones

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  1. Indoor positioning and navigation with camera phones A. Mulloni et al., Graz Univ. of Tech., IEEE Pervasive Computing, pp. 22-31, 2009. 이시혁 theshy@sclab.yonsei.ac.kr

  2. Contents • Introduction • Conference Guide Application • Comparison of localization techniques • Experiment • Result • Experiences from real-world deployment • Usefulness • Conclusion

  3. Introduction • GPS-based navigation systems • Only outdoors • Required satellite links • Indoor : blocked or unreliable • Real-time marker-based tracking of position system • GPS-like real-time localization • Location awareness • Testing real-world conditions

  4. Conference Guide Application • Location-based conference guide • Sparse tracking • Markers to a manageable size • Signpost • Combines a conference calendar and navigation system • Calendar : day or conference session, or using full-text • Live RSS updates • Can plan their fastest route(from the current location) • System • Studierstube ES framework • Windows mobile phone • Impact the Battery life

  5. Conference Guide Application • 3D overview • For large event • Multiple maps • Step for deploying the system to new location • Create a map and database of marker locations • Deploy markers on site • Create a new software release

  6. Comparison of localization techniques • No localization and continuous localization • A digital map with no localization • Continuous real-time localization(GPS-based navigation systems) • Experiment • Environment • 20 users (half male and half female) • diverse cultural backgrounds • varying expertise in technology • between 20 and 34 years old(average 25) • 3-Condition • no-localization • discrete localization • continuous-localization

  7. Experiment • No-localization condition • a digital map viewer • finger touch screen • access each floor’s maps using keypad shortcuts on the phone • start and destination points(all condition) • Discrete localization condition • marker-based solution • each marker’s position as a red dot • updated the user’s detected position and orientation • Continuous-localization condition • not available GPS(indoor) • used “Wizard of OZ”

  8. Result • Rank the three conditions • (1) easy to use • (2) easy to learn • (3) requires little attention • (4) make me confident I know where I am (a) Average ranking of the three localization systems (b) Statistical significance of pair-wise differences

  9. Experiences from real-world deployment • Signpost at four international conferences • MEDC 2007 • Microsoft Tech Ed 2007 • TechReady6 • TechReady7 • MEDC 2007 • 34 anonymous questionnaires • 1(strongly disagree) ~ 7(strongly agree) • TechReady7 • 64 users questionnaires • 1(useless) ~ 5(useful)

  10. Usefulness • 3D overview map • Not very helpful • Eye-candy • Small screen • Navigation • Tracking accuracy • Fiduciary markers

  11. Conclusion • Signpost • The first indoor navigation system • Deployed at several large-scale venues successfully • Now commercial product • Future works • Compare this guidance system with paper maps • integrating online marketing campaign material • Goal • Conference guide • Generic system for indoor navigation.

  12. Marker based local awareness system • Map • Without GPS sensor • Available feature phone • Recommendation • Marker-based LBS • User’s interesting • Shopping mall • Department store

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