A particle filter for tracking multiple humans in high-density crowds. Based on the following paper:
I. Ali and M. N. Dailey, “Multiple human tracking in high-density crowds,” in Advanced Concepts for Intelligent Vision Systems (ACIVS), vol. LNCS 5807, 2009, pp. 540–549
Video used in this paper from: http://www.youtube.com/watch?v=TdFvJ5ye7J8