License Plate Recognition or LPR is an image-processing technology used to identify vehicles by their license plates. This technology is used in various applications involving security, traffic, law enforcement, public safety and transportation sectors. It mainly uses software code that enables computer systems to read automatically the registration number (license number) of vehicles digital pictures.-License Plate Recognition or LPR is an image-processing technology used to identify vehicles by their license plates. This technology is used in various applications involving security, traffic, law enforcement, public safety and transportation sectors. It mainly uses software code that enables computer systems to read automatically the registration number (license number) of vehicles　digital pictures.