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Xu et al. J Surveill Secur Saf 2020;1:16-33  I  http://dx.doi.org/10.20517/jsss.2020.04                                                              Page 29



































                                   Figure 12. Location of the simulated escape center in the intersection diagram


































                                            Figure 13. Influence of K value on detection results


               the UMN dataset. This experiment was mainly to verify the accuracy of the algorithm in the actual
               environment.


               The concept of “escape center” is used to approximate the abnormal scattered behavior of the crowd.
               According to the state of the crowd distribution index and acceleration characteristics on the playing field,
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