• Transportation terms in Automatic Number Plate Recognition and License Plate Recognition (ANPR/LPR) by ARH
Transportation terms in Automatic Number Plate Recognition and License Plate Recognition (ANPR/LPR) by ARH

TERMINOLOGY AND ABBREVIATIONS OF THE ANPR INDUSTRY – PART TWO


Wednesday, 30 January 2019 10:49

In the previous part of ANPR terminology, you could read about photography terms used in ANPR. In the present part you can review key concepts and their names in ANPR – with brief explanations.

Transportation terms in ANPR

ANPR is closely related to transportation. This is why a lot of traffic-related terms appear in the description of ANPR products:

  • Vehicle registration plate types like
    vanity plates, vehicle owners paying extra money to pick their individual letter/number combination for the plate
    also called personalized plates and a mixture of
    reflective reflects the light
    (sometimes called retroreflective), and non-reflective plates.

Vanity license plates need special attention in License Plate Recognition because they do not follow standard plate syntax
Vanity license plates do not follow standard plate syntax
  • Application areas – or fields of use – like
    speed enforcement, recording speeding events and sanctioning/ticketing drivers,
    sometimes called
    road speed limit enforcement, and traffic enforcement, recording traffic offenses and sanctioning drivers
    congestion charging, a fee for the use of inner city streets in order to make urban areas livable
    also called road congestion pricing and
    road pricing charging a fee for road use
    (also known as tolling)
  • Industry stakeholders include systems integrators companies that build turnkey systems out of component subsystems or traffic authorities maintaining the rule of the road by monitoring traffic via patrol cars and multi-sensor
    traffic points traffic monitoring and data collection device.

Traffic data collection point with License Plate Recognition by ARH
ARH's traffic data collection point with License Plate Recognition by ARH

ANPR is closely related to transportation. This is why a lot of traffic-related terms appear in the description of ANPR products:

  • Fixed ANPR is a device permanently placed on the roadside or on an above-the-road structure called gantry to capture license plates.
  • Portable ANPR and mobile ANPR systems are operated from a tripod or from a patrol vehicle, or can even be-hand-held units.
  • A trigger is a traffic detector to sense the presence of a vehicle. Its signal starts the process of automatic number-plate recognition. Triggering may be physical, like an inductive (or induction) loop installed in the road, or a motion detector sensing moving objects, similar to the ones attached to outdoor automatic lights. Triggering can be software-based as well and promising Vehicle Detection technologies are in the works.
  • ANPR range expresses the distance from which a vehicle’s plate can be captured. This range varies widely from a few meters to hundreds of meters, depending on the device.
  • A red light  camera senses traffic offenders driving through red traffic lights and takes photos that can be used as evidence by traffic authorities.

Red light cameras automatically detect and record traffic offences of driving through red traffic signals
Red light cameras automatically detect traffic violations and make intersections safer
  • An image buffer is the capacity of the ANPR system to temporarily store images for processing.
  • Related technologies, (like information technology), and their technical terms like bandwidth, processing power, data storage capacity and encryption, (data is encoded and only visible for those who can decode it), are also frequently used terms.
  • Onboard vs external ANPR refers to the location where the images of license plates are processed. Plate recognition can be integrated into the camera or – alternatively – it can be done outside the camera, on a central server or local computer. Both types of system architecture have advantages and drawbacks.

ANPR cameras take ANPR-optimized images; some ANPR camerasrun onboard ANPR software and detect vehicle presence with integrated radar
ANPR-optimized images – onboard ANPR software – vehicle detection via integrated radar

In the third part of the article you can read about spelling and term differences of US and UK English in ANPR.