Configuring the Fight detector VL

To configure the Fight detector VL, do the following:

Go to the Detectors tab.
Below the required camera, click Create… → Category: Other → Fight detector VL.

By default, the detector is enabled and set to detect a fight in the scene.

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

Parameter	Value	Description
Object features
Video stream	Main stream	If the camera supports multistreaming, select the stream for which detection is needed
Record objects trajectories	Yes	The metadata of the video stream is recorded to the database by default. To disable the parameter, select the No value
Record objects trajectories	No
Object identification
Name	Fight detector VL	Enter the detector name or leave the default name
Enable	Yes	By default, the detector is enabled. To disable, select the No value
Enable	No
Type	Fight detector VL	Name of the detector type (non-editable field)
Decoder mode	Auto	Select a processing resource for decoding video streams. When selecting a GPU, a stand-alone graphics card takes priority (decoding with Nvidia NVDEC chips). The decoding uses the Intel Quick Sync Video technology if there is no appropriate GPU. Otherwise, CPU resources are used for decoding
	CPU
	GPU
	HuaweiNPU
Basic settings
Detection mode	CPU	Select the processor for detector operation (see Selecting Nvidia GPU when configuring detectors)
	Nvidia GPU 0
	Nvidia GPU 1
	Nvidia GPU 2
	Nvidia GPU 3
Tracking frame rate (fps) (starting with Detector Pack 3.17)	4	Enter the frame rate at which tracking occurs. The value must be in the range [1, 50]
Frame rate for fight evaluation (fps) (starting with Detector Pack 3.17)	1	Enter the frame rate required to determine the presence or absence of a fight. The value must be in the range [0,016, 50]
Period of ignoring repeated recognitions (sec)	30	Enter the time in seconds during which events aren't processed after successful detection. The parameter is necessary to reduce the total number of events since the analysis is performed continuously, and the duration of real events can be several seconds. You must select the required value empirically. The value must be in the range [0, 9999]
Minimum fight authenticity threshold (starting with Detector Pack 3.17)	50	Enter the threshold value that recognizes behavior as a fight. The higher the value, the less frequently fights are detected, but the detections are more reliable. You must select the appropriate values empirically. The value must be in the range [1, 100]
Distance sensitivity (starting with Detector Pack 3.17)	30	Enter the distance threshold between tracks at which tracks are merged. The higher the value, the greater the distance at which tracks are merged
Advanced settings
Minimum object authenticity threshold		Enter the minimum threshold of object authenticity at which an object is considered detected. The higher the value, the fewer objects are detected, but the more reliable the detection is. You must select the appropriate values empirically. The value must be in the range [1, 100]
Visual Element
Visual Element	Detection area (rectangle)	A rectangular area within which the detection is performed (non-editable field)

In the preview window, set the area for object detection. You can configure the detection area by moving the anchor points (see Configuration of a detection area).

Note

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 (see Configuration of a detection area). 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 Fight detector VL is complete.

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Documentation for Axxon One 3.0/3.1 version. Documentation for Axxon One 2.0 version is also available.