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Kaj Grønbæk

Time-lag Method for Detecting Following and Leadership Behavior of Pedestrians from Mobile Sensing Data

Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review

  • Mikkel Baun Kjærgaard, Denmark
  • Henrik Blunck, Denmark
  • Markus Wüstenberg, Denmark
  • Kaj Grønbæk
  • Martin Wirz, Wearable Computing Laboratory, ETH Zurich, Switzerland
  • Daniel Roggen, Wearable Computing Laboratory, ETH, Switzerland
  • Gerhard Tröster, Wearable Computing Laboratory, Switzerland
The vast availability of mobile phones with built-in movement and location sensors enable the collection of detailed information about human movement even indoors. As mobility is a key element of many processes and activities, an interesting class of information to extract is movement patterns that quantify how humans move, interact and group. In this paper we propose methods for detecting two common pedestrian movement patterns, namely individual following relations and group leadership. The proposed methods for identifying following patterns employ machine learning on features derived using similarity analysis on time lagged sequences of WiFi measurements containing either raw signal strength values or derived locations. To detect leadership we combine the individual following relations into directed graphs and detect leadership within groups by graph link analysis. Methods for detecting these movement patterns open up new possibilities in — amongst others — computational social science, reality mining, marketing research and location-based gaming. We provide evaluation results that show error rates down to 7%, improving over state of the art methods with up to eleven percentage points for following patterns and up to twenty percentage points for leadership patterns. Our method is, contrary to state of the art, also applicable in challenging indoor environments, e.g., multi-story buildings. This implies that even quite small samples allow us to detect information such as how events and campaigns in multistory shopping malls may trigger following in small groups, or which group members typically take the lead when triggered by e.g. commercials, or how rescue or police forces act during training exercises.
Original languageEnglish
Title of host publicationIEEE International Conference on Pervasive Computing and Communications (PerCom), 2013
Number of pages9
Publication year2013
Pages56 - 64
ISBN (print)978-1-4673-4573-6, 9781467345750
ISBN (Electronic)978-1-4673-4574-3
Publication statusPublished - 2013
Event IEEE International Conference on Pervasive Computing and Communications - San Diego, CA, United States
Duration: 18 Mar 201322 Mar 2013
Conference number: 11


Conference IEEE International Conference on Pervasive Computing and Communications
LandUnited States
BySan Diego, CA

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