3M is unique in that it is based in the United States, and manufactures all major system components. 3M ALPR can accurately perform at traffic volumes of over 1,000 vehicles per hour.
Elements of Automated License Plate Recognition (ALPR) Technology
- Platefinder – Sophisticated firmware continually searches the camera's field of view for the presence of a license plate.
- Dual Lens Camera – As a license plate is detected, the dual lens camera is triggered to capture both color and infrared images of the vehicle and plate. Infrared cameras are able to see license plates regardless of sun glare, darkness, or other adverse conditions.
Triple Flash Technology
This patented technology varies the flash, shutter and gain settings of the camera to capture multiple plate images, ensuring the highest quality photo regardless of light or weather conditions. Only the image determined to produce the highest quality read is sent on for processing.
Optical Character Recognition "Engine"
OCR is optical character recognition, or the ability for a machine to recognize printed characters and convert them into data. 3M develops and maintains its own library of OCR engines. 3M uses a customized OCR engine specific to the state, region, or country of interest. 3M OCR engines are very tolerant of skewed and off-axis plate reads, various plate sizes, syntax rules, and designs. The engine reads the captured infrared plate image and converts it to a data file. 3M uses a customized OCR engine specific to the state or region of interest. 3M OCR engines are very tolerant of skewed and off-axis plate reads, various plate sizes, syntax rules, and designs. The engine reads the captured infrared plate image and converts it to a data file.
In addition to housing the patented platefinder and triple flash technologies, 3M processors
perform the OCR translation and can use the captured data in a variety of ways via a 3M software application or 3rd party solution.
interfaces, specific to the industry or application, allow the user of the system to easily view and manage the data.