“…In order to investigate the essence of pedestrian flow in a controllable way, some pedestrian flow experiments were conducted in recent years (Daamen & Hoogendoorn, 2003;Isobe et al, 2004;Helbing et al, 2005;Kretz et al, 2006;Moussaid et al, 2009;Zhang et al, 2011Zhang et al, , 2012Li & Dong, 2012;Lian et al, 2015). Many of them are recorded by cameras, and the video data can be good resource for the study of pedestrians' behaviors.…”