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Crowd panic state detection using entropy of the distribution of enthalpy

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  • Zhang, Xuguang
  • Shu, Xiaohu
  • He, Zhen

Abstract

The motion state of a crowd can be described using the change of energy information of pedestrians’ motion. Enthalpy can be used to describe the state of a system by consider the energy of the system. The distribution of enthalpy will change follow the change of a crowd state. Entropy is very suitable for measure the degree of disorder of a system Based on this idea, a crowd panic state detection method is proposed in this paper according to the entropy of the distribution of enthalpy. Firstly, the optical flow of two frames is calculated to get the motion information of a crowd. Secondly, based on the results of optical flow, the pedestrian moving region can be gained based on flow field visualization and texture segmentation method. Therefore the enthalpy in a tiny image region can be gained in the effective crowd movement region. The distribution of the enthalpy for the motion field with moving pedestrians can be gained. Based on the distribution of enthalpy, entropy of each frame can be calculated to describe the crowd state. Experimental results show the panic crowd motion state has higher entropy, and normal crowd state has lower entropy.

Suggested Citation

  • Zhang, Xuguang & Shu, Xiaohu & He, Zhen, 2019. "Crowd panic state detection using entropy of the distribution of enthalpy," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 525(C), pages 935-945.
    • Handle: RePEc:eee:phsmap:v:525:y:2019:i:c:p:935-945
    DOI: 10.1016/j.physa.2019.04.033
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    References listed on IDEAS

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    Cited by:

    1. Secrest, J.A. & Conroy, J.M. & Miller, H.G., 2020. "A unified view of transport equations," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 547(C).

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