Detect and Read Number Plates

Media Server can detect and read number plates that appear in video.

To detect and read number plates in video

  1. Create a new configuration or open an existing configuration to send to Media Server with the process action. Alternatively, you can modify the Media Server configuration file (mediaserver.cfg).

  2. In the [Analysis] section, add a new analysis task by setting the AnalysisEngineN parameter. You can give the task any name, for example:

    [Analysis]
    AnalysisEngine0=ANPR
  3. Create a new section in the configuration file to contain the task settings and set the following parameters:

    Type The analysis engine to use. Set this parameter to numberplate.
    Input (Optional) The image track to process. If you do not specify an input track, Media Server processes the first track of the correct type that is produced by the ingest engine.
    Location The location in which you are reading number plates. There are significant differences in the number plates used by countries and states, so this parameter is necessary to read the plates successfully.
    Region (Optional) The region of interest (ROI) to monitor for number plates (left, top, width, height). If you do not specify a region, Media Server detects and reads number plates anywhere in the scene.
    RegionUnit (Optional) The units used to specify the position and size of the region of interest (pixel or percent).
    Sensitivity (Optional) The confidence level required to detect a number plate.
    Integration (Optional) The method to use to combine the number plates read from successive frames into a single result (none, moving, or static).
    MinValidScore (Optional) The average character score required for a number plate to be recognized.

    For example:

    [ANPR]
    Type=numberplate
    Location=uk
    RegionUnit=percent
    Region=20,10,60,90
    Sensitivity=14
    Integration=moving
    

    For more information about the parameters that customize number plate recognition, refer to the Media Server Reference.

  4. Save and close the configuration file. If you modified the Media Server configuration file, you must restart Media Server for your changes to take effect.


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