Crowd monitoring uses cameras and analytics to observe how many people are in an area, where they move and whether density is rising. It supports safety and operations as much as security. Useful output is a count and a trend that staff can act on, not a picture of a crowd for its own sake.
Counting people is an old operational question, and cameras make it continuous. The value is in the decision the count enables, not in the image itself.
Counting and density
Analytics estimate head counts, occupancy in a zone and the rate at which people pass a line. Density maps show where a crowd is tightening before an incident occurs. Accuracy falls under heavy occlusion, so a system should be calibrated at the site and its error understood.
Privacy and notice
Crowd analytics can run without identifying individuals if the system counts rather than recognizes. That distinction belongs in the deployment decision, along with signage, a retention rule and an answer to who may review the footage. Notice and policy are part of the system.