Investigating NOPLATE reads - Security Center 5.10

Security Center User Guide 5.10

Applies to
Security Center 5.10
Last updated
Content type
Guides > User guides
Security Center

If a Sharp camera fails to capture a plate when it is configured to use the Continuous with virtual loop or Single read on trigger reading mode, no ALPR image is associated with the read, and the plate number appears as NOPLATE.

What you should know

  • If the camera fails to capture a plate, no ALPR image is associated with the read and the plate number NOPLATE is associated with the read. This reading mode is appropriate for maintaining higher vehicle count accuracy in parking lots when recording occupancy, particularly in areas or in seasons that might have a higher rate of no read events (for example, in muddy or snowy weather conditions). For more information, see Editing license plate reads.

  • You cannot edit a plate read if the read is protected, or if the read is from a federated system or an MLPI inventory.
  • When a plate read is edited, if there is a confidence score associated with the plate read, the confidence score is changed to 100%.
  • The details of the plate read edit appear in the Activity trails report.
  • If the system generates too many NOPLATE reads (one car generates multiple NOPLATE reads, or a vehicle is detected but does not appear in the image) or too few NOPLATE reads (vehicles that pass the camera are not detected), you can recalibrate the Sharp camera’s virtual loop feature. For more information see Calibrating the virtual loop.


  1. From the home page, open the Reads task.
  2. From the ALPR units - Patrollers list, select the camera to investigate.
  3. Select the License plate filter and enter NOPLATE.
  4. Click Generate report.
    Reads with no associated plate number are listed in the report pane.
  5. If the vehicle's plate is visible in the context image, you can edit the plate read to include the correct plate number.
    1. Double-click the read to display it in a tile.
    2. From the license plate read tile, click Modify ().
    3. In the Edit read window, manually modify the plate information as required.
    4. Click Save.