Documentation for Axxon Next 4.5.0 - 4.5.10. Documentation for other versions of Axxon Next is available too.

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ANPR is a detection tool that reads license / number  plates of vehicles in FoV.

Attention!

The license plate recognition requires a CPU that supports the SSE4.1 / SSE4.2 instructions.

Attention!

Axxon Next ANPR / LPR is not compatible with Auto Intellect.

Uninstall the Axxon Next VMS  and Auto Intellect,  then reinstall Axxon Next.

To configure ANPR, do as follows:

  1. Select the License plate recognition (VT) object (1).

  2. If you require using this detection tool for real-time number plate recognition (see Configuring real-time vehicle license plate recognition), set the corresponding parameter to Yes (2).

  3. If you need to enable recording of metadata, select Yes from the Record Objects tracking list (3).
  4. If a camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream allows reducing the load on the Server (4).

  5. Select detection tool working mode: standard or neural (1). 

  6. In the appropriate fields, select one or more countries for ANPR (2).

    Important

    The more countries you select, the slower the recognition and the greater the likelihood of the recognition error.

  7. Select a processing resource for decoding video streams (3). When you select a GPU, a stand-alone graphics card takes priority (when decoding with NVidia NVDEC chips). If there's no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding.

  8. Analyzed framed are scaled down to a specified resolution (4, 1920 pixels on the longer side). This is how it works:

    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, it is used further.

    3. If the resulting resolution still exceeds the specified limit, it is divided by two, etc.

      Note

      For example, the source image resolution is 2048 * 1536, and the limit is set to 1000.

      In this case, the source resolution will be divided two times (down to 512 * 384): after the first division, the number of pixels on the longer side exceeds the limit (1024 > 1000).


  9. Select the current license type (5).

    LicenseDescription
    Search in archiveBasic ANPR Search License. Attention! This type of license provides a 30-sec delay between the number recognition and the corresponding event.  (see Vehicle number plate recognition and search).
    25 FPS or 6 FPSThe 25 FPS license has a priority. The 6 FPS license is used only if you have no 25 FPS license. You cannot use the number plate recognition function if you have no FPS licenses purchased.
    25 FPSThe "Fast" license allows you to process video feeds up to 25 fps with a maximum vehicle speed of 150 km/h. You have to obtain an appropriate license to make ANPR work.
    6 FPSThe "Slow" license allows you to process video feeds up to 6 fps with a maximum vehicle speed of 20 km/h. You have to obtain an appropriate license to make ANPR work.

    Important

    All license types except the standard one (Search in archive) require the hardware key or the software key activation (see Activating a software license key for the ANPR).

    You can use a 60-day trial key (see Activating the trial version of the ANPR via a software key).

    Important

    On a virtual machine, you may use only a hardware key. To use a hardware key, select the 25 FPS or 6 FPS license type.

  10. Set the maximum and minimum width of the vehicle number plate as a percentage of the FoV width (6, 7).

    Important

    The Minimum LP width parameter affects the CPU load as follows: the higher the parameter is, the higher the load.

  11. Choose a processor to run detection on (8). In standard mode, detection runs on the CPU only.

  12. Set the number of frames required for LPR / ANPR (9). This is though a necessary condition, but not sufficient for the first output. This condition delays LPR output.  This parameter allows to increase the reliability of the results, as well as to hide false positives.

  13. If necessary, configure  advanced detection settings (see Fine-tuning the VT number plate detection tool).

  14. You can configure an ANPR zone in FoV. The zone is resized by moving the anchor points.

    Note

     For your convenience, you can click the  button and configure the mask on a still frame / snapshot. To undo, click this button again.

    Note

    Detection zone is displayed by default. You can click the  button to hide the zone. To undo, click this button again.

  15. Click the Apply button.

Configuration of ANPR  is now complete.

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