The common application of license plate recognition system is parking lot charge management. Integrated license plate recognition system, can automatically recognize license plates, passing vehicles through the crossing without stopping, that is, can realize automatic identification of vehicle identity, automatic billing. In the parking lot management, for the efficiency of vehicles passing through the entrance and exit, license plate recognition for vehicles that do not need to collect parking fees (such as monthly trucks, internal vehicles), the construction of unattended fast channel, card free, no parking access experience, is changing the management mode of access to the parking lot.