License Plate Recognition System Integrated Machine License Plate Recognition Parking Lot System - T

Whether a license plate recognition system is practical or not, the most important index is the recognition rate. International transportation technology has made a special discussion on the recognition rate index, which requires that the correct recognition rate of all signs is 85% 95% 24 hours a day. In order to test the recognition rate of a license plate recognition system, it is necessary to install the system in a practical application environment, operate for more than 24 hours all day, collect the license plate recognition of at least 1000 natural traffic flow, and store the vehicle license plate image and recognition results for retrieval and viewing. Then, we also need to get the actual passing vehicle image and the correct manual recognition results. After that, the following recognition rates can be counted: 1. Recognition rate of natural traffic flow = total number of correctly recognized full license plates / total number of actually passing vehicles 2. Percentage of recognizable license plates = total number of correctly read license plates manually / total number of actually passing vehicles 3 The correct recognition rate of the whole license plate that can be recognized = the total number of correctly recognized license plates of the whole license plate / the total number of manually read license plates. These three indicators determine the recognition rate of the license plate recognition system, such as reliability and false recognition rate, which are the intermediate results in the process of license plate recognition. The recognition speed determines whether a license plate recognition system can meet the requirements of real-time practical application. If a system with high recognition rate needs a few seconds or even minutes to recognize the results, the system will be of no practical significance because it can not meet the real-time requirements in practical applications. For example, in highway toll collection, one of the functions of license plate recognition application is to reduce traffic time, and speed is a powerful guarantee to reduce traffic time and avoid lane traffic jam in this kind of application. The recognition speed proposed by international transportation technology is less than 1 second, the faster the better.