Configuring the Abandoned object detector VI (Street)

To configure the Abandoned object detector VI (Street), do the following:

Go to the Detection Tools tab.
Below the required camera, click Create… → Category: Trackers → Abandoned object detector VI (Street).

By default, the detection tool is enabled and set to detect abandoned objects.

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	Abandoned object detector VI (Street)	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
Background sensitivity (%)	100	Controls the sensitivity to object contrast. Specify the value as a percentage that is responsible for the detection tool ability to distinguish the level of object contrast relative to the background. The higher the value, the object with less contrast can be detected. The value must be in the range [0, 100]
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 area sensitivity	Medium level	Select the detection area sensitivity. The Medium level of sensitivity is selected by default. Additional neural network processing is applied in this area
Detection area sensitivity	Low level
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
Detection sensitivity	70	Specify the level of the detection sensitivity. Value should be in the range [0, 255]
Event intersection time (sec)	0.01	Specify the time interval in seconds during which events won't be processed after successful detection when the event results match. The parameter determines the level of intersection between new and previous events. If the specified value is exceeded, it is considered that these events refer to the same real object. 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, 1]
Frame size change	640	Specify the size to which the video is compressed before analysis. The value must be in the range [480, 960]
Ignore time (sec)	5	Specify the time interval in seconds during which events won't be 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]
Maximum brightness	255	Specify the maximum brightness of an object to trigger detection. The value must be in the range [0, 255]
Maximum object height (%)	100	Specify the minimum object size as a percentage of the frame height to get an event from the detection tool. If objects are smaller than specified, there won't be any events from the detection tool. The value must be in the range [0, 100]
Maximum object width (%)	100	Specify the maximum object width as a percentage of the frame width to get an event from the detection tool. If object width is larger than specified, there won't be any events from the detection tool. The value must be in the range [0, 100]
Minimum object area (%)	0	Specify the minimum object area as a percentage of the frame area to get an event from the detection tool. If object area is smaller, there there won't be any events from the detection tool. The value must be in the range [0, 100]
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.
Object filter	Yes	By default, the neural network object filter is disabled. To enable, select the Yes value
Object filter	No
Object frame intersection	0	Specify the percentage of the object frame intersection that must be merged into one object. The value must be in the range [0, 100]
Person filter	Yes	By default, objects near people aren't ignored. To ignore objects near people, select the Yes value
Person filter	No
Ratio of object height to width	90	Specify the maximum level of object extension to get an event from the detection tool. The value must be in the range [0, 100]
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
Scene static (%)	25	Specify the scene static as a percentage. The higher the value of the parameter, the lower the scene dynamics. The value must be in the range [0, 100]
Scene update threshold	10	Specify the scene update threshold. If the number of changes in the frame exceeds the value of this parameter, the background is updated. The value must be in the range [0, 9999]
State saving interval	0	Specify the state saving interval in seconds. The value must be in the range [0, 9999]
Time for detection (sec)	120	Specify the time in seconds after which an object is considered abandoned. The value must be in the range [0, 9999]
Type	Abandoned object detector VI (Street)	Name of the detection tool type (non-editable field)

In the preview window, you can specify the detection areas using the anchor points (see Configuring 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. To cancel the action, click this button again.

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

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