To create the Loitering in area detector, do the following:

  1. Create the required detector and specify its parameters (see Configuring detectors and their sub-detectors).
  2. Below the created detector, click Create… → Loitering in area.

By default, the detector is enabled and set to generate events when an object leaves the detection area after spending some time there.

If necessary, you can change the detector parameters. The list of parameters is given in the table:

ParameterValueDescription
Other
EnableYesThe detector is enabled by default. To disable the detector, select the No value
No
NameLoitering in areaEnter the detector name or leave the default name
Event hold time (sec)2

The parameter is taken into account only if the Trigger on group of objects parameter is enabled.

This is the time period during which the detector waits for the next objects after the first object in the group is detected. If the specified number of objects (specified in the Number of alarm objects parameter) are detected within this time period, the detector generates an event. If no additional objects are detected within the specified time period, the detector doesn't generate an event. 
Specify the time period in seconds when events will be held when responding to a group of objects. The value must be in the range [0, 86400]

TypeLoitering in areaName of the detector type (non-editable field)
Advanced settings
X-axis offset15

Specify the X-axis and Y-axis offsets as a percentage of the track area to receive events from the specified area. The values must be in the range [1, 40]

Y-axis offset10
Basic settings
Event duration to trigger detection (sec)30Specify the time of the object staying in the detection area in seconds. The value must be in the range [0, 86400]
Maximum object height100

Specify the maximum object height as a percentage of the frame size for the detector to generate an event. The value must be in the range [0.05, 100]

The values of the maximum object height must be equal in the settings of the Object tracker and Loitering in area.

Maximum object speed500

Specify the maximum object speed per second for the detector to generate an event. The value must be in the range [0, 500]

  • In Axxon One, speed is a conditional value that is calculated using values of different dimensions. The speed calculation algorithm takes into account both the frame width and its height.
  • For a visual understanding of the speed values, we recommend specifying the speed when searching the archive (see Configuring minimum and maximum object speed).
Maximum object width100

Specify the maximum object width as a percentage of the frame size for the detector to generate an event. The value must be in the range [0.05, 100]

The values of the maximum object width must be equal in the settings of the Object tracker and Loitering in area.

Minimum object height0.1

Specify the minimum object height as a percentage of the frame size for the detector to generate an event. The value must be in the range [0.05, 100]

The values of the minimum object height must be equal in the settings of the Object tracker and Loitering in area.

Minimum object speed0

Specify the minimum object speed per second for the detector to generate an event. The value must be in the range [0, 500]

  • In Axxon One, speed is a conditional value that is calculated using values of different dimensions. The speed calculation algorithm takes into account both the frame width and its height.
  • For a visual understanding of the speed values, we recommend specifying the speed when searching the archive (see Configuring minimum and maximum object speed).
Minimum object width0.1

Specify the minimum object width as a percentage of the frame size for the detector to generate an event. The value must be in the range [0.05, 100]

The values of the minimum object width must be equal in the settings of the Object tracker and Loitering in area.

Number of alarm objects2

The parameter is taken into account only if the Trigger on group of objects parameter is enabled.

This number determines the minimum number of objects that are considered a group and can generate an event. 
Specify the number of objects that can cause the detector to generate an event. The value must be in the range [1, 100]

Object classAll classes

Select the object class that must generate an event. The default value is All classes

  • When you create the Loitering in area detector as a child object of the Object tracker and select the Person value, there won't be any events if the tracker detects the movement of several people nearby.
  • When you create the Loitering in area detector as a child object of the Category: Face and Category: Vehicle detectors, the Object class parameter must have the All classes value.
Vehicle
Person
Time detection modeSpecified timeThe detector generates an event after the object leaves the area after spending there the time specified in the Event duration to trigger detection (sec) parameter (default value)
Longer than specified timeThe detector generates an event after the object leaves the area after spending there more time than specified in the Event duration to trigger detection (sec) parameter. If an event has already been generated and the track is still in the area after an event, the event won't be generated again until the track leaves the area and enters it again
Shorter than specified timeThe detector generates an event after the object leaves the area after spending there less time than specified in the Event duration to trigger detection (sec) parameter
Trigger on group of objectsYes

The parameter is disabled by default. If you want the detector to generate an event only for a group of objects, select the Yes value

  • The group of objects that must cause the detector to generate an event is specified in the Object class parameter.
  • The number of objects that are considered a group is specified in the Number of alarm objects parameter.
  • Waiting time for the next objects after the first object from the group is detected is specified in the Event hold time (sec) parameter.

For example, you select the Person object class, the Number of alarm objects is 3, the Event hold time (sec) is 2 seconds, and the Trigger on group of objects parameter is enabled. If the detector detects the first person and detects others within two seconds, these people are considered a group and the detector generates an event. 

No

By default, the entire frame is a detection area. If necessary, in the preview window, you can reduce the detection area (see Configuring a detection area) and/or set one or more skip areas (see Configuring a skip area).

  • For convenience of configuration, you can "freeze" the frame. Click the button. To cancel the action, click this button again.
  • The detection area is displayed by default. To hide it, click the button. To cancel the action, click this button again.

To save the parameters of the detector, click the Apply  button. To cancel the changes, click the Cancel  button.

Configuration of the Loitering in area detector is complete.