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Automatic License Plate Readers (ALPR)


ALPR systems are available to meet agency needs for both the pubic and private sectors. The systems described below are best used in combination to create a robust detection system within your community. There are a number of ALPR manufacturers which provide a variety of systems and capabilities.


It is imperative that before selecting an ALPR consideration be given to the types of systems already used by neighboring jurisdictions, the ability to share data (plate reads and images) among jurisdictions, state laws regarding data preservation, and the development of an overall ALPR plan, to include future system expansion.


FIXED ALPR: These systems are permanently installed ALPR systems covering a designated section of a roadway. Most ALPR cameras are capable of covering two lanes of traffic, traveling in the same direction. The significant differentiators for Fixed LPR systems surrounds the cameras, the Optical Character Recognition (OCR) algorithm being used to detect the license plate characters and the AI interface that may provide additional features such as vehicle type, make, model, color, or characteristics such as bumper stickers, roof racks, or vehicle damage.


Fixed ALPR cameras are either single lens systems or designated dual lens ALPR cameras. They typically can be considered high speed (up to 120 mph), or low speed (up to 80Mph). The dedicated dual lens ALPR cameras will provide reads up to 120 mph, and have built in infra-red illuminators to improve low light performance,


The single lens systems are typically low speed cameras, use motion detection to "wake" the cameras and have shutter speeds capable of capturing images of vehicles up to about 80-85 MPH.


Mobile ALPR systems are vehicle mounted systems that are installed on service vehicles to provide active or passive alerting. These systems can be installed on police cars or parking enforcement vehicles for active alerting or on garbage trucks, fire vehicles, or other vehicles for passive alerting.


Quick Deploy ALPR: These systems are typically low speed systems with internal battery power, solar power, or optional 12volt converters. These systems are used for quick deployments, can typically cover two lanes of traffic up to 85 Mph.


In-Car Video ALPR: These systems are just starting to emerge in the market. They use updated in car video systems to capture vehicle tags as the police officer patrols his area of responsibility. Typically these cameras will read 180 degrees in front of the vehicle and capture plate reads for vehicles approaching or departing from the patrol car.


Video Management System APLR: These ALPR systems use software OCR programs overlaid on incoming video streams from city or private owned cameras to detect vehicle license plates. These systems are typically used in parking garages or other low speed, choke-point detection locations.


APP-Based ALPR: Several ALPR providers are now offering App-Based plate detection using a mobile device based app. These app based systems are generally used for investigative purposes to record vehicles at a crime scene.


High Speed ALPR Manufacturers

Motorola Solutions Vigilant ALPR

ELSAG ALPR

Open ALPR


Low Speed ALPR Manufacturers

Motorola Solutions Vigilant ALPR

ELSAG ALPR

FLOCK Public Safety

Rekor Recognition Systems: Open ALPR


In-Car Video ALPR

Axon Public Safety / Flock

Motorola Solutions Vigilant ALPR


Quick Deploy ALPR

Motorola Solutions Vigilant ALPR

ELSAG ALPR

FLOCK Public Safety

Rekor Recognition Systems: Open ALPR


App Based ALPR

Motorola Solutions Vigilant ALPR

Rekor Recognition Systems: Open ALPR


VMS Based ALPR

Genetec

Milestone

Avigilon



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