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In this detection scenario, the person enters the zone 3 times. At each point an alarm is
raised, resulting in a total of 3 alarms. With the Alarm Holdoff Time configured, it's possible
to prevent re-triggering of the same rule for the same object within the configured time
period. Consider the same scenario, but with an Alarm Holdoff Time of 5 seconds
configured:
In this case, an alarm is not raised when the person enters the zone for the second time,
because the time between the occurrence of the last alarm of the same type for the object is
less than the Alarm Holdoff Time. When the person re-enters the zone for a third time, the
elapsed time since the previous alarm of the same type for that object is greater than the
Alarm Holdoff time and a new alarm is generated.
In essence, the Alarm Holdoff Time can be configured to prevent multiple alarms being
generated because an object is loitering on the edge of a zone. Without Alarm Holdoff Time
configured, this scenario would cause so-called "Alarm chatter".
Stationary Object Hold-on Time
The Stationary Object Hold-on Time defines the amount of time that an object will be
tracked by the engine once it becomes stationary. Since objects which become stationary
must be "merged" into the scene after some finite time, the tracking engine will forget
about objects that have become stationary after the Stationary Object Hold-on Time. The
default setting is 30 seconds.
Tracking Options
Minimum Tracked Object Size
The Minimum Tracked Object Size defines the size of the smallest object that will be
considered for tracking, in pixels. Normally there is no need to modify this value. Decreasing
it will allow the engine to track smaller objects at the expense of noise immunity.
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