Post on 24-Feb-2016
description
Indoor positioning and navigation with camera phones
이시혁
theshy@sclab.yonsei.ac.kr
A. Mulloni et al., Graz Univ. of Tech., IEEE Pervasive Computing, pp. 22-31, 2009.
S FT COMPUTING @ YONSEI UNIV . KOREA16
Contents• Introduction
• Conference Guide Application
• Comparison of localization techniques
• Experiment
• Result
• Experiences from real-world deployment
• Usefulness
• Conclusion
S FT COMPUTING @ YONSEI UNIV . KOREA16
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
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S FT COMPUTING @ YONSEI UNIV . KOREA16
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
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S FT COMPUTING @ YONSEI UNIV . KOREA16
• 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
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Conference Guide Application
S FT COMPUTING @ YONSEI UNIV . KOREA16
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
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S FT COMPUTING @ YONSEI UNIV . KOREA16
Experiment
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• 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”
S FT COMPUTING @ YONSEI UNIV . KOREA16
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
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S FT COMPUTING @ YONSEI UNIV . KOREA16
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)
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S FT COMPUTING @ YONSEI UNIV . KOREA16
Usefulness
• 3D overview map– Not very helpful– Eye-candy
• Small screen
• Navigation
• Tracking accuracy
• Fiduciary markers
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S FT COMPUTING @ YONSEI UNIV . KOREA16
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.
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S FT COMPUTING @ YONSEI UNIV . KOREA16
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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