calculation method of license plate recognition system < / a > recognition rate

Whether the license plate recognition system is practical or not, the recognition rate is a very important index. International transportation technology has been used as a special recognition rate indicator. The requirement is that the correct recognition rate is 85% ~ 95%

In order to test the recognition rate of the license plate recognition system, the system needs to be installed in a practical application environment running 24 hours a day or more, collect license plates for at least 1000 circulating natural vehicles and recognize licenses. Board image and recognition. Store results for retrieval. Then, you need to get the actual vehicle image and correct manual recognition results. The following recognition rates can then be calculated:

1. Recognition rate of natural traffic flow = correctly recognized integer / total number of actual passing vehicles

2. Percentage of recognizable license plates = the total number of license plates correctly read by people / the total number of vehicles actually passed

3. The correct recognition rate of the whole card = the total number of license plates correctly recognized by the whole card / the total number of license plates manually read. These three indicators determine the recognition rate of the license plate recognition system, such as reliability, false recognition rate and so on. The intermediate result is the license plate recognition process