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Crowd management research shows a lack of depth in the literature insofar as most major incidents can be prevented or minimized by a proper management strategy. Specifically, if abnormal crowd events can be detected early and the relevant governing agency can take appropriate actions towards mitigating the dangers, accidental injury can be prevented or the incident can be contained. This paper presents a technical approach to gather the required crowd data using fixed cameras to collect visual data while using a grid model to describe the crowd distribution. The measured area will be divided into several unit areas and each unit area is considered to be a simple cell in a grid model. The state value of each unit area is determined by changes in the total number of active pixels within the unit area. Under the circumstances, the motion status of the measured area is represented by a dynamic state matrix …