Configuration mode > Administration > Other hardware > License plate recognition

License plate recognition

To configure an LPR module, you first have to create it in the OnSSI VA administration tool (see Ocularis Recorder VA Administration Tool)

Lane configuration
  1. Activate the module and, if necessary, alter the name.
  2. Select the appropriate LPR module.
  3. Select the appropriate camera.
  4. Select the appropriate video classification.
    The video classification determines the video profile used in surveillance mode for the various modes (normal, selected, alarm).
    With MPEG-4/H.264 streaming the frame rate for recognition must correspond to the frame rate for default recording on the selected camera, while any desired value can be entered for Motion JPEG.
  5. Select the desired role. For example, in LPR mode you can restrict the search to all entrances and you do not need to selected every entrance lane manually.
  6. Enter the frame rate for recognition to specify the number of images per second that are to be transmitted to the module. With MPEG-4/H.264 streaming the frame rate for recognition must correspond to the frame rate for default recording on the selected camera, while any desired value can be entered for Motion JPEG.
  7. Specify the number of days after which LPR events (recognized license plates, changes to master data, etc.) are to be deleted.
  8. Select the assigned cameras and assigned layers that are to be displayed in LPR mode in addition to the camera.
  9. Select Event-based recognition or Continuous LPR. With event-controlled recognition license plate recognition is only started after an event, e.g. if a vehicle passes through a light barrier.
  10. Enter the pre-delay and the post-delay in seconds for event-controlled recognition. This period is used for recognition of the license plate, i.e. the images of this period are sent for OCR recognition.
  11. Activate Export at next trigger event. As soon as this function is activated, the images are exported at the next trigger event to the LPR mode for license plate recognition and stored in the "VersatileApplications" folder in accordance with the pre-delay, post-delay and frame rate parameters. Example ClosedFrame rate: 2 fps
    Pre-delay: 1s
    Post-delay 2s
    At the next trigger event six images are saved to the "VersatileApplications" directory (pre-delay+post-delay * 2fps).
    This setting is only applicable for the coming event and is used to check the parameters. It is applicable for only one event and is disabled after export.
  12. Enter the time between identical license plates for continuous recognition. This specifies how long the same license plate must be viewed.Example ClosedLicense plate recognition at a gas station: The time between same license plates is set to 60 seconds.
    Scenario 1: Car 1 arrives -> license plate recognition is started - car 1 leaves -> start 60 seconds - car 1 returns within 60 seconds -> no license plate recognition because the car returned within 60 seconds.
    Scenario 2: Car 1 arrives -> license plate recognition is started - car 1 leaves -> start 60 seconds - car 1 returns after 60 seconds -> license plate recognition again because the car did not return within 60 seconds
  13. Specify the number of images within which the license plate must be clearly recognized in the Number of required frames box.
  14. Click the Create new list button to save one or more license plate lists.
    Select a list and assign a license plate group to it to be able to analyze it.
List configuration
  1. Select a list.
  2. Activate the list and, if necessary, alter the name.
  3. Select the license plate groups that are to be analyzed. In the associated alarm scenario the user can specify, for example, that an alarm is triggered by a license plate from list 1 and that a barrier is automatically opened for a license plate from list 2.
  4. Apply the set values if you want to make further settings.
  5. Save the set values to apply the values and conclude input.