Configuring the Movement in prohibited direction VI detector

To configure the Movement in prohibited direction VI detector, do the following:

Go to the Detection Tools tab.
Below the required camera, click Create… → Category: Trackers → Movement in prohibited direction VI.

By default, the detection tool is enabled and set to generate events when an object crosses the virtual line in any direction.

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

Parameter	Value	Description
Object features
Record objects tracking	Yes	The metadata of the video stream is recorded to the database by default. To disable the parameter, select the No value
Record objects tracking	No
Video stream	Main stream	If the camera supports multistreaming, select the stream for which detection is needed
Other
Enable	Yes	By default, the detection tool is enabled. To disable, select the No value
Enable	No
Name	Movement in prohibited direction VI	Enter the detection tool name or leave the default name
Background accumulation	Yes	By default, scene background accumulation is enabled. To disable, select the No value
Background accumulation	No
Decoder mode	Auto	Select a processing resource for decoding video streams. When you select a GPU, a stand-alone graphics card takes priority (when decoding with Nvidia NVDEC chips). If there is no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding
	CPU
	GPU
	HuaweiNPU
Detection mode	CPU	Select the processor for the detection tool operation (see Selecting Nvidia GPU when configuring detectors)
	Nvidia GPU 0
	Nvidia GPU 1
	Nvidia GPU 2
	Nvidia GPU 3
Duration	40	Specify the duration of the object's movement in the prohibited direction. This parameter can be useful when analyzing dense passenger flows, in which an object moving in the opposite direction appears in the camera's field of view only for short periods of time. The rest of the time, it is hidden from the camera's view by the crowd. The value must be in the range [1, 100]
Frame size change	640	Specify the size to which the video is compressed before analysis. The value must be in the range [480, 960]
Head size	50	Specify the size of a person's head in the frame. The value should be given as a percentage of the frame's vertical side and must be in the range [1, 100]
Intensity	10	Specify the value that can characterize the threshold visibility of the object's movement in the area. When this value is exceeded, the detector is triggered. The value must be in the range [1, 50]
Minimum number of objects	0	Specify the minimum number of objects required to trigger the detection tool. The value must be in the range [0, 20]
Number of execution threads	4	Specify the number of execution threads. The value must be in the range [0, 100]
Number of frames processed per second	12	Specify the number of frames processed per second. Value should be in range [0.016, 100] Attention! The detector operates optimally with the default value for most use cases. Changing this value may reduce the detector's performance quality.
Permissible angle of deviation from specified direction	45	Specify the angle in degrees indicating the permissible range of the object's direction of movement in the prohibited direction from the direction specified by the arrow. The so-called "detection cone". The value must be in the range [1, 180]
Saving background	Yes	By default, saving the scene background is enabled. To disable, select the No value Attention! Background files are automatically saved to the directory C:\ProgramData\VideoIntellect\. The size of this folder can quickly increase, potentially filling up all available space on the C drive. It is not possible to set a limit on the maximum volume of this directory, so it’s important to periodically check its contents and clear it if necessary.
Saving background	No
State saving interval	0	Specify the state saving interval in seconds. The value must be in the range [0, 9999]
Type	Movement in prohibited direction VI	Name of the detection tool type (non-editable field)

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

The Movement in prohibited direction VI detector is configured.

Configuring detection area and virtual line

By default, the detector is configured to generate events when an object crosses a virtual line in any direction in a given area. To configure the virtual line and detection area, in the preview window do the following:

Set the area in which objects will be detected by moving the nodes . By default, the entire frame is the detection area.

Set the virtual line:

Specify the end points of the line

:

Action	Result
Hover the cursor over the end point and, holding down the left mouse button, move the mouse	Moving the end point of a line
Hover the cursor over the line and, holding down the left mouse button, move the mouse	Moving the line

By default, both directions of object movement through the line are detected. To stop the detection in the required direction, click the button corresponding to this direction.
Attention!
- You must select at least one direction for detection.
- An unmonitored direction of object movement is indicated by a dimmed arrow.
Note
- The end points are connected by a two-color dashed line. The directions of object movement through the line are indicated by dotted arrows.
- For convenience of configuration, you can "freeze" the frame. Click the button. To cancel the action, click this button again.
- To hide the virtual line and detection area, click the button. To cancel the action, click this button again.

Click Apply .

The detection area and virtual line configuration is complete.

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Documentation for Axxon One 2.0. Documentation for other versions of Axxon One is available too.

Configuring detection area and virtual line