You can define areas in the video to trigger events when a person is detected in
those areas.
What you should know
- In intrusion detection scenarios, an area is an alarm region. You can define
multiple areas in a scenario to monitor for intrusion. Settings are configured
per area.
- You can enable the Show movement grid option to visualize
the sensitivity of your configuration. This option displays the analysis blocks
that make up an area in different colors to show when they are active, and when
the velocity, path deviation, and travel distance is properly detected.
NOTE: Depending on which scenario type you are configuring, some
settings might be unavailable or hidden if Advanced mode
is
disabled.
Procedure
-
From the Config
Tool home page,
open the Video task.
-
From the area view, select a camera that you applied an analytics scenario
to.
-
Click , and then click the scenario you want to configure.
-
Click the Areas tab.
-
Define the area as required:
-
Click and drag the area to move it to the location you want.
-
Click and drag the white dots to adjust the shape and size of the
area.
-
(Optional) Add or remove areas.
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In the Area name field, rename the selected area.
-
In the Tracking section, configure the following
settings:
- Min. speed
- The minimum speed at which an object or person must travel to
trigger an alert.
NOTE: The velocity estimation is based on the
configured perspective and depends on the accuracy of the configuration.
- Max. speed
- The maximum speed at which an object or person must travel to
trigger an alert. When this maximum speed is exceeded, no alert is triggered. This
option can be used to ignore fast moving objects, such as trains.
- Min travel distance
- The minimum distance that an object or person must travel to
trigger an alert.
Increasing this
value can help minimize false alerts on small movement, such as trees moving in the
wind.
NOTE: The distance is estimated based on
the configured perspective, which might result in inaccuracies.
-
In the Alert section, configure the following
settings:
- Min. time between alerts
- The minimum period between alerts that can be triggered for an area.
Using a low value ensures that multiple alerts that are part of a single real-life event
are captured. Using a high value might suppress valid alerts that occur quickly after
one another.
- Alert activation time
- The period for which a detection must remain in an alarm
region before it can trigger an alert. Using a high value filters out camera noise, but
might result in missed alerts.
- Min. detection size
- Specifies how much of the detected object has to be active in the
alarm region to trigger an alert. Using a low value might cause small motion patterns,
such as animals to be detected. Using a high value can result in missed detections of
people or objects.
- Detect all active blocks
- When this option is selected, active blocks anywhere in the defined area can trigger
alerts.
- Detect only connected blocks
- When this option is selected, only active blocks that are adjacent to each other can
trigger alerts. This option minimizes false alerts caused by scattered movement, such as
camera noise.
-
Click Apply.
Example
For
an alert to be triggered, a person or object must do the following:
- Travel at a speed between the configured Min. speed and
Max. speed.
- Travel at least the Min. travel distance.
- Travel within the Max. deviation angle along the defined
path.
- Travel for at least the period specified for the Alert activation
time.