The earliest large-scale monitoring application will wait until the first generation of analog video monitoring was born in the late 1970s. The core equipment is the video switching matrix.
It is also called closed-circuit television monitoring system, or CCTV for short.
This monitoring system still has a large market share even after 50 years.
But at the beginning of 1970's, this technology was not mature and did not flow out widely in human society.
However, as a strong and stable society in developed countries, there is no doubt about the speed of response.
In just one hour, most of the tourists who fled from the museum were blocked in the museum