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

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To configure the License Plate Recognition IV detection tool, do the following:

  1. Submit to the technical support the MAC address of the Server on which you will use the detection tool.

    Attention!

    The detection tool won't operate on the Server with a different MAC address.

  2. Copy the license received from technical support into the C:\Program Files\Common Files\AxxonSoft\DetectorPack\LicenseFile_LprIV.txt file.

  3. Restart the Server (see Shutting down a Server, Starting a Server).

To create the License Plate Recognition IV detection tool, do the following:

  1. Go to the Detection Tools tab.
  2. Below the required camera, click Create… → Category: Vehicle → License Plate Recognition IV.

By default, the detection tool is enabled and set to recognize vehicle license plates.

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

ParameterValueDescription
Object features
Check in listsYesThe Check in lists parameter is disabled by default. If you want to use this detection tool to check in lists of vehicle license plates, select the Yes value (see Configuring vehicle license plate recognition based on the created lists)
No
Record objects trackingYesThe metadata of the video stream is recorded to the database by default. To disable the parameter, select the No value
No
Video streamMain streamIf the camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream reduces the load on the Server
Second stream
Other
EnableYesThe detection tool is enabled by default. To disable the detection tool, select the No value
No
NameLicense Plate Recognition IVEnter the detection tool name or leave the default name
Decoder modeAutoSelect 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
TypeLicense Plate Recognition IVName of the detection tool type (non-editable field)
Advanced settings
Event timeout1Specify the time in seconds after which the alarm must be generated after recognizing a license plate in the frame. The value must be in the range [1, 3600]. If the value is 0, the alarm will be generated after the track with a license plate is lost
Frame size change1920

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

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


Maximal number of characters in LP10Specify the maximum number of characters in the license plate. The value must be in the range [1, 20]
Minimal number of characters in LP5Specify the minimum number of characters in the license plate. The value must be in the range [1, 20]
Minimum recognition quality, in %80Specify the minimum quality of license plates recognition as a percentage. The higher the minimum recognition quality, the fewer false alarms. The value must be in the range [0, 100]
Tracker timeout3

Specify the time in seconds after which the vehicle track is considered lost. The value must be in the range [0, 3600].

Note

You can use this parameter to avoid double triggerings that can occurs, for example, when a license plate is recognized when it appears in the frame, then it is overlapped by a visual obstacle and then recognized by the detection tool again. If you specify the timeout longer than the time of possible overlapping of the license plate in the frame, the detection tool will trigger only once.


Basic settings
Algorithm for detecting vehicle directionBy LP coordinates

The By LP coordinates algorithm is used by default. It works as follows: if the coordinates of the vehicle license plate shift from top to bottom (the vehicle moves towards the camera) and if the coordinates of the vehicle license plate shift from bottom to top (the vehicle moves away from the camera).
Select the By LP scale change parameter if in the Surveillance window, the scale of the vehicle license plate increases (the vehicle moves towards the camera) and if the scale of the vehicle license plate decreases (the vehicle moves away from the camera)

By LP scale change
Maximum LP width10

Specify the maximum and minimum width of the license plate as a percentage according to the actual size of the license plate in the frame.

Attention!

  • Specified vlaues must exclude omissions in license plate recognition, that is the values must not be smaller than the real size of the license plate in the frame. Otherwise, the license plates won't be recognized.
  • The Minimum LP width parameter affects the CPU load: the higher the value, the lower the load.
  • Reducing the difference between the maximum and minimum width reduces the CPU load.


Minimum LP width1
Processing unit




CPU

Select the processor for the detection tool operation—CPU or one of NVIDIA GPUs (see General information on configuring detection).

Attention!

  • It may take several minutes to launch the algorithm on NVIDIA GPU.
  • If you have multiple graphics cards in your system, you can assign a specific NVIDIA GPU value to each License Plate Recognition IV detection tool.


Nvidia GPU 0
Nvidia GPU 1
Nvidia GPU 2
Nvidia GPU 3
Country selection
Country nameAustralia, Austria, Bangladesh, Belarus, Brazil, Canada, China, Costa Rica, Czech Republic, Dubai, Egypt, Finland, France, Germany, Great Britain, India, Indonesia, Iraq, Israel, Italy, Japan, Kazakhstan, Kuwait, Mexico, Monaco, Mongolia, Netherlands, Pakistan, Poland, Qatar, Republic of South Africa, Russia, Saudi Arabia, Slovenia, South Korea, Spain, Sri Lanka, Switzerland, Taiwan, Thailand, Turkey, Ukraine, United Arab Emirates, United States of America, Uzbekistan, Vietnam

Select from the list the country whose license plates you want to recognize and select the recogniton accuracy:

    1. High load, high recognition—provides maximum recognition accuracy, but creates a high load on the CPU and/or graphics processing unit (GPU).
    2. Medium load, medium recognition—provides high recognition accuracy, requires less computing resources than at maximum accuracy.
    3. Low load, low recognition—provides the fastest recognition speed, while lowering recognition accuracy

In the window, specify the area in which license plate detection and recognition will be performed. You can adjust the area by moving the anchor points .

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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