Affiliations: Department of Civil & Environmental
Engineering, University of Yamanashi, Takeda 4-3-11, Kofu, Yamanashi, Japan.
E-mail: jyoshida@ccn.yamanashi.ac.jp | Department of Civil Engineering, the University of
Tokyo, Bunkyo 7-3-1, Tokyo, Japan. E-mail: fujino@civil.t.u-tokyo.ac.jp | Department of Civil & Environmental
Engineering, University of Yamanashi, Takeda 4-3-11, Kofu, Yamanashi, Japan.
E-mail: t-sugiyama@yamanashi.ac.jp
Abstract: An image processing technique to capture motions of crowds is
proposed and it is applied to understanding pedestrian-induced lateral
vibration in a footbridge. Firstly, an outline of recording sequential images
of vibration in the bridge is described and, then an image processing for
human-head recognition from a single image of crowd is developed. In this
method, conventional template matching techniques with human-head templates are
extended by employing some selected templates, an updated search-algorithm and
a classifier for clustering. Consequently, more than 50% of human-heads could
be identified by the proposed method. Then, motions of detected human-heads,
together with the bridge response, are tracked. Finally, interaction between
the motions of pedestrians and the vibration of the bridge is discussed, with
the emphasis on synchronization between the responses of the pedestrians and
the bridge.
