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

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Video stream and scene requirements for the Queue detector

Image requirements for the Queue detector

To configure the Queue detector, do the following:

  1. Go to the Detection Tools tab.

  2. Below the required camera, click Create… → Category: Retail → Queue detector.

By default, the detector is enabled and set to count the number of people in a queue.

If necessary, you can change the settings of the detector parameters given in the table:

ParameterValueDescription
Object features
Record mask to archiveYesBy default, the recording of the mask to the archive is disabled. To record the sensitivity scale of the detector to the archive (see Displaying information from a detector (mask)), select the Yes value
No
Video streamMain streamIf the camera supports multistreaming, select the stream for which detection is needed
Other
EnableYesBy default, the detector is enabled. To disable, select the No value
No
NameQueue detectorEnter the detector name or leave the default name
Decoder modeAutoSelect a processing resource for decoding video. 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
Number of frames processed per second1Specify the number of frames for the detector to process per second. The larger the value, the greater the load on the CPU. The value must be in the range [0.016; 100]
TypeQueue detectorName of the detector type (non-editable field)
Advanced settings
Current queue size report interval0The default value is 0 (no events are sent). To send events to AxxonData (see Queue length report), specify the interval of events transmission in seconds. The value must be in the range [0, 600]
Frame size change 1920

The analyzed frames are scaled down to a specified resolution (1920 pixels on the longer side) by default. The following algorithm is used:

  1. If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.
  2. If the resulting resolution falls below the specified value, the algorithm stops and this resolution will be used further.
  3. If the resulting resolution still exceeds the specified value, it is divided by two until it is less than the specified resolution.

Note

For example, the source image resolution is 2048*1536, and the specified value is set to 1000. In this case, the source resolution will be halved two times (512*384), as after the first division, the number of pixels on the longer side exceeds the specified value (1024 > 1000). If detection is performed on a higher resolution stream and detection errors occur, we recommend reducing the compression.

Basic settings
Person size10

Note

It is better to specify the minimum size of a person graphically, the number in the Person size field is a conditional value. The value must be in the range [0.25, 10]

Click the button and specify the minimum size of a person. To do this, move the anchor points of the rectangular area:

Queue size5Specify the number of objects in a queue. When the number is exceeded, an event is generated. The value must be in the range [2, 20]
Sensitivity0.5Specify the sensitivity of the detector. The higher the sensitivity, the better the algorithm reacts to minor motion. If you specify the minimum sensitivity value, only significant scene changes can be analyzed by the Queue detector.
You must specify the sensitivity value empirically based on the data from the motion mask (see Displaying information from a detector (mask)) in the preview window

In the preview window, you can specify the detection area by moving 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 detector, click the Apply  button. To cancel the changes, click the Cancel  button.

Configuration of the Queue detector is complete. The detector will generate events of the following type:

Camera. Detection "Queue detector" triggered, queue (min.: 10, max.: 10)

where min. and max. is estimated queue length. 

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