The second revolution is the introduction of technologies such as long-distance Bluetooth, which allows a fixed vehicle to read and open the card without having to roll down the window. The speed of passing vehicles is faster, and rain and snow are more convenient. However, the long distance does not solve the issue of picking up cards for foreign temporary vehicles. Therefore, the application of reforms has not been thorough, and the cost has been increased on the basis of the original IC cards. The problems caused by the card still exist. For example, some toll collectors leave temporary cards privately, occupying charges, or getting temporary vehicles to enter the market for fixed vehicles, which results in the loss of large numbers of temporary cards, increasing the use cost and charging losses to users. .
The application of license plate recognition technology brings opportunities for the third change of the system. The main requirements for parking entrances and exits are as follows: 1. Entrance record time, gate opening; 2. Appearance record time, and gate opening after billing; , Fixed vehicles automatically confirm the opening gate, 4, statistics and inquiries. By identifying the license plate number as the carrier, the problem of the card is solved and the above requirements of the user are better satisfied (the listed advantages are the same as above), and the identified license plate number can be further uploaded to the * large-scale parking lot management platform of the department, Shenzhen and East China. Other places have requested the parking lot to upload license plate identification data to build a large platform for smart city bayonet big data.
The technology of license plate recognition system is becoming more and more mature, and the recognition rate is getting higher and higher. The most important indicator to judge whether the license plate recognition system is good or bad is the recognition rate. International transportation technology has discussed the impact of a special recognition rate, requiring that the recognition rate of qualified brands 24 hours a day be 85%-95%. In order to test the recognition rate of a license plate recognition system, it is necessary to install the system in an actual application environment, work for more than 24 hours all day, collect at least 1000 natural vehicle traffic information specimens for license plate recognition, and the recognition results and license plate images need to be stored. Get the view. Then, it is also necessary to manually recognize the result and correctly obtain the actual vehicle image. Then, the statistics of the recognition rate:
1. The recognition rate of natural traffic flow = the total number of correctly identified total number of cards / the total number of vehicles actually passed 2. The percentage of identifiable vehicle license plates = the total number of vehicle license plates correctly read / the total number of vehicles actually passed 3. The entire card can be identified correctly Recognition rate = the total number of car licenses correctly identified by the entire card / the total number of manually read car licenses These three indicators determine the recognition rate of the license plate recognition system, such as the credibility, error rate, etc. are intermediate results in the license plate recognition process. .
With the development of the times, the original parking entrance and exit management system has become increasingly unsuited to the current needs, and the parking license plate recognition system is a dedicated system developed for the current modern intelligent parking lot. It is foreseeable that, in the future, the parking license plate recognition system will reverse the pattern of China's parking management system.
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