Automatic number plate recognition (ANPR) is a technology that uses optical character recognition on images to read vehicle registration plates.


  • ANPR is used by municipalities to keep track of incoming and outgoing traffic.
  • Environmental zones need categorization of traffic.
  • Around airports, the traffic is monitored to detect patterns as an anti-terrorism measure.
  • Since a number plate is unique, it can be used for signaling suspect cars, (blacklist matching) or regulating access to a private area (whitelist matching).
  • A false number plate can in most cases be detected by car classification.
  • Suspicious patterns in visiting highway parking can be related to criminal activities
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