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(Automatic License Plate Recognition) Also called "automatic number plate recognition" (ANPR), it is a law enforcement system that optically scans vehicle license plates. Using fixed-position cameras on highways or mobile cameras in patrol cars, the system identifies the plate and matches it against a database of stolen and uninsured vehicles, as well as vehicles registered to drivers with suspended licenses. Equipped with an ALPR, a police official can drive through a parking lot and process the plate number of every parked car. Some systems even photograph the driver.

From Fixed to Mobile
Developed in Europe in the late 1970s, the first systems used fixed cameras at highway intersections. Subsequent systems migrated to mobile use with faster cameras and better recognition algorithms. In addition, laptop computers became more powerful over the years, enabling more economical and effective mobile use.

Toll Collection and Speeding
ALPR is also used with toll collection systems such as E-ZPass to identify vehicles that go through a toll booth without paying and without an RFID tag. It is also used in combination with highway speed detection systems to identify violators and send them speeding tickets.

People Are Always Creative
Drivers have tried to circumvent these systems by obscuring theletters and digits in some manner or by making their plates more reflective with a plastic cover or spray. However, some countries that have used ALPRs have made modifications to the fonts on the next version of their plates to make them easier to identify at high speeds.
References in periodicals archive ?
While Corbett (2008) explored ALPR in the United Kingdom, I focus more on them in the United States.
The integration of ALPR functionality offers Toughbook Arbitrator users a more powerful policing tool at a fraction of the cost of multi-camera license plate recognition systems.
Figure 3 shows the ACPR, ALPR and transducer gain (TG) as functions of the output power at 836.
No one disputes that ALPRs have been shown to be an effective, and cost-effective, crime-fighting tool.
The enhanced complete Motorola ALPR solution includes the new Slate cameras, Motorola's MW810 Mobile Workstation, the ALPR expansion board for the MW810, PAGIS in-vehicle software that interoperates with the cameras to capture and read license plates, and BOSS back-end software that aggregates information from multiple ALPR systems to enhance intelligence capabilities.
the services includes consolidate our automated license plate recognition (alpr) platform under a single vendor that will assist us to streamline purchase, delivery, and support of the agency~s alpr services.
Tenders Are Invited For Hyderabad Division:- MBNR- DHNE Section - Shifting of 32 starters at 12 stations viz : BVO, VDI, UKD, DUU, KRNT, ALPR, MOA, IKI, GWD, SRNR, WPR and MQN - Signal & Telecom arrangements.
We are also very impressed with its reliable LTE connectivity and, because it offers 4-port Gigabit Ethernet, we will be able to support more in-vehicle equipment, such as video cameras and ALPR, bringing the full functionality of our office network to our patrol officers.