Vehicle License Plate Recognition (VLPR) is an application of computer video image recognition technology in vehicle license plate recognition. License plate recognition is widely used in highway vehicle management. In the electronic toll collection (ETC) system, it is also the main means of identifying vehicle identity with DSRC technology.

License plate recognition technology requires the ability to extract and recognize vehicle license plates in motion from a complex background. Through license plate extraction, image preprocessing, feature extraction, license plate character recognition and other technologies, the vehicle license plate number, color and other information can be recognized. The current state of the art The recognition rate of letters and numbers can reach 99.7%, and the recognition rate of Chinese characters can reach 99%.

In parking lot management, license plate recognition technology is also the main means to identify vehicle identity. License plate recognition technology has become the main means of vehicle identification.

License plate recognition technology combined with electronic toll collection system (ETC) to identify vehicles, passing vehicles do not need to stop when they pass the crossing, that is, automatic identification of vehicles and automatic charging can be realized. In parking lot management, in order to improve the efficiency of entrance and exit vehicles, license plate recognition is aimed at vehicles that do not need to charge parking fees (such as monthly trucks, internal free vehicles), and build unattended fast lanes, free of cards, and no parking experience. Change the management mode of entering and exiting the parking lot.