Match lists

A match list is a set of license plate numbers, aliases, and/or vehicle properties the system can check for. When a captured license plate matches one on the match list, it can trigger actions like alerts, gate access, or law enforcement notifications. Match lists are used for cases such as security, parking control, tolling, and tracking vehicles of interest.

You can add the following matching criteria to match lists:

• A license plate registration number, such as ABC 1234??

• Alias, such as DK_PRIVATE. Only system administrators can add aliases.

• Make, such as Toyota

• Model, such as Corolla

• Type, such as Car

• Color, such as Blue

• Side, such as Front.

Each license plate recognition belongs to a match list. The default one is the Unlisted license plate. You can create custom match lists with different criteria depending on your need.

License plate recognitions are compared with the match lists. If there is a match, the system triggers a match list event. Match list events are stored on the event server. Operators can search for and view match list events on the LPR tab in XProtect Smart Client. By default, match lists events are stored for 90 days. You can change the settings if you need to. See Change the retention time for match lists and LPR server events.

For each match list you create, you can define rules and alarms that trigger a match list event when there is a match.

Examples:

• A company headquarter uses a list of executive management's company car license plates to grant executives access to a separate parking area. When executives' license plates are recognized, the system triggers an output signal that opens the gate to the parking area.
• A chain of gas stations creates a list of license plates from vehicles that have previously left gas stations without paying for their gas. When such license plates are recognized, the system triggers output signals that activate an alarm and temporarily block the gas supply to certain gas pumps.

You can also use triggered events to force cameras to record in high quality or similar. You can even use an event to trigger combinations of such actions.

Associating match lists with LPR cameras

By default, all match lists are listed to all LPR cameras. But if you need to, you can associate certain LPR cameras and match lists if you need only specific LPR cameras to handle specific match lists.

You can make that association by going to LPR servers > LPR cameras, then you choose the relevant LPR camera and go to the Match list tab to select the match lists to associate with the particular camera.