application principle of license plate recognition system < / a >

License plate recognition system 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 electronic toll collection (etc) system, it is also the main means of vehicle identification combined with DSRC technology

License plate recognition technology requires that the moving vehicle license plate can be extracted and recognized from the complex background. Through license plate extraction, image preprocessing, feature extraction, license plate character recognition and other technologies, the vehicle license plate, color and other information can be recognized. At present, the technical level is that 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 is combined with electronic toll collection system (etc) to identify vehicles. When passing vehicles pass through the crossing, they do not need to stop, that is, they can realize automatic vehicle identification and automatic toll collection. In the parking lot management, in order to improve the traffic efficiency of vehicles at the entrance and exit, license plate recognition aims at vehicles that do not need to charge parking fees (such as monthly trucks and internal free passing vehicles), building unattended fast lanes and the access experience of card free and non parking, which is changing the management mode of entering and leaving the parking lot