Journal of Intelligent Information Systems

, Volume 48, Issue 1, pp 75–115 | Cite as

Skeleton clustering by multi-robot monitoring for fall risk discovery

  • Yutaka Deguchi
  • Daisuke Takayama
  • Shigeru Takano
  • Vasile-Marian Scuturici
  • Jean-Marc Petit
  • Einoshin Suzuki
Article
  • 306 Downloads

Abstract

This paper tackles the problem of discovering subtle fall risks using skeleton clustering by multi-robot monitoring. We aim to identify whether a gait has fall risks and obtain useful information in inspecting fall risks. We employ clustering of walking postures and propose a similarity of two datasets with respect to the clusters. When a gait has fall risks, the similarity between the gait which is being observed and a normal gait which was monitored in advance exhibits a low value. In subtle fall risk discovery, unsafe skeletons, postures in which fall risks appear slightly as instabilities, are similar to safe skeletons and this fact causes the difficulty in clustering. To circumvent this difficulty, we propose two instability features, the horizontal deviation of the upper and lower bodies and the curvature of the back, which are sensitive to instabilities and a data preprocessing method which increases the ability to discriminate safe and unsafe skeletons. To evaluate our method, we prepare seven kinds of gait datasets of four persons. To identify whether a gait has fall risks, the first and second experiments use normal gait datasets of the same person and another person, respectively. The third experiments consider that how many skeletons are necessary to identify whether a gait has fall risks and then we inspect the obtained clusters. In clustering more than 500 skeletons, the combination of the proposed features and our preprocessing method discriminates gaits with fall risks and without fall risks and gathers unsafe skeletons into a few clusters.

Keywords

Skeleton clustering Human monitoring Mobile robots Service-oriented DSMS 

Notes

Acknowledgements

A part of this research was supported by a Bilateral Joint Research Project between Japan and France funded from Japan Society for the Promotion of Science (JSPS) and Centre National de la Recherche Scientifique (CNRS/JSPS PRC 0672), and JSPS KAKENHI 24650070 and 25280085.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Yutaka Deguchi
    • 1
  • Daisuke Takayama
    • 1
  • Shigeru Takano
    • 1
  • Vasile-Marian Scuturici
    • 2
  • Jean-Marc Petit
    • 2
  • Einoshin Suzuki
    • 1
  1. 1.ISEEKyushu UniversityFukuokaJapan
  2. 2.INSA-LyonCNRS, Université de LyonVilleurbanneFrance

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