Multi-channel server licensing for LPR

LPR software from Digifort enables multiple camera inputs to be processed on a single server core using one licence.

Digifort ANPR software displayThe Digifort vehicle License Plate Reading (LPR) system is a multi-channel, licence module operating within its open-platform video management system (VMS). It offers reliable identification and categorisation of white or black-listed licence plates and is widely used in vehicle access control, traffic enforcement, toll collection positions, border crossings and general site management applications.

Since the Digifort LPR (or ANPR) licence applies to a server CPU core and not a camera channel, it avoids the need to have multiple licensing across several cameras.

The licensing of the product depends on the type of server used and the applications it has to support. For example, if the LPR is triggered by motion, two channels are enabled by a single core licence since many frames will be needed in order to capture the best image from a moving vehicle. However, if an external, physical trigger is used to capture a single video image, the server processing overhead is significantly less and up to 20 LPR channels can be enabled by a single core licence.

Explaining the flexibility of the system for handling different access control requirements, Digifort’s Business Development Director for EMEA, Francois Levy said, “In vehicular access control environments, its user-configured management database enables categories such as staff, stolen cars, site visitors, delivery vehicles, unrecognised plates and even “followed vehicles” to be triggers. Corresponding alarm actions can be scheduled for different outcomes by time of day or week.”

The LPR system recognises a plate’s characters and registers the plate on a management database or in an external folder with date, time and camera information tags. The database can be synchronised with external databases, such as from the police or DVLA, with associated vehicle owner information, if available. Plate data can also be shared between numerous, multi-channel, Digifort systems, across many sites.

Expanding further on the flexibility of the system, Levy continued, “Digifort can read plates accurately on fast-moving vehicles and allow incoming and outgoing plate cameras to be set, to establish vehicle duration times, as used in car park ticketing. Surrounding cameras can also correlate with the primary, plate-capture cameras to provide additional video data, such as the front, side or cab of a vehicle.”

A suspect plate event can trigger a visual and audible warning, increase recorded video resolution and frame rate and notify users by email, text or SMS. A “mask” facility allows users to apply alarm rules to groups of plates and specify plate retention times. Automatic server failover is an option for mission-critical applications and plate recognition accuracy is measured to help users optimise camera set-up.

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