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 to send to Media Server with the process action, or open an existing configuration that you want to modify.

  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

    (Set this or LocationWithPriorities) A comma-separated list of ISO-3166 codes to specify the locations for which you want to recognize number plates. Specify the primary location first. For example, if you are recognizing number plates in France but also want to recognize plates from Germany and Belgium, set this parameter to Location=FR,DE,BE.

    LocationWithPriorities

    (Set this or Location) A comma-separated list of ISO-3166 codes to specify the locations for which you want to recognize number plates, and their relative priorities.

    For example, if you are recognizing number plates in France but are near the border and also want to recognize plates from Germany and Belgium, you might set LocationWithPriorities=fr:1.0,de:0.1,be:0.01. This instructs Media Server that French, German, and Belgian number plates are expected, but German plates are 10 times less likely to be seen than French plates, and Belgian number plates are 100 times less likely to be seen than French plates.

    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=GB
    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. HPE recommends that you save your configuration files in the location specified by the ConfigDirectory parameter.


_HP_HTML5_bannerTitle.htm