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Video Analysis
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6. To define the minimum ratio of change (in the alarm region) for the alarm to be activated, move the
Ratio of Changes slider to set a value. The smaller the ratio of changes, the more sensitive the
system is to the changes in the camera view.
7. To define the minimum time that a crowd needs to stay for the alarm to be activated. Use the
Tolerance Time of Alarm slider to specify a value or type a number in the blank.
8. Optionally configure the following settings:
Automatically disable alarm: Triggered alarms are automatically disabled after the specified
time (seconds). The default setting is 30 seconds.
Automatically disable alarm when the crowd disperses: Triggered alarms are
immediately disabled when no crowds are detected.
Skip Instant Light Change: Ignores sudden illumination changes to minimize false alarms.
For example, light switches can cause illumination changes suddenly. With the option
selected, the system will ignore significant illumination changes without triggering the alarm
and continue monitoring. See the Note below for possible risk.
Invoke Alarm: Enables the computer alarm when an assemblage is detected. Click the […]
button next to the option to assign a .wav sound file.
Output Module: Activates the output device when a crowd is detected. Select this option and
use the drop-down list to assign an installed output module and a pin number.
Never Recycle: Prevents the system from recycling the event files of crowd detection when
the recycle threshold is reached.
9. You can click Test to test your settings. When an assemblage is detected in the camera view, a
flashing box will appear on its location for warning. If an assemblage cannot be detected, decrease
Ratio of Changes to increase the system sensitivity for detection.
10. Click OK to apply the settings.
11. Start monitoring to run the application. The detected crowd is indicated on the live view with
blinking red and green boxes.
When a crowd of people gathers in the alarm region for the specified time, its location will be
highlighted on live view, the selected alarm or output will be activated, and the event will be recorded
as Crowd Detection in the System Log for later retrieval.
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