Technical characteristics of license plate recognition system

License plate recognition technology is an important part of modern intelligent transportation system, and its application is very extensive. Based on computer vision processing, digital image processing, pattern recognition and other technologies, it processes and analyzes the vehicle images or video images shot by the camera to get the license plate number of each vehicle, thus completing the recognition process. Through some post-processing technologies, the functions of parking lot entrance and exit charge management, vehicle theft management, expressway speeding automation management, electronic police running red lights, expressway charge management and so on can be realized. It is of practical significance for maintaining traffic safety and urban public order, preventing traffic jams and realizing automatic traffic management.

China standard car license plate consists of Chinese characters, English letters and Arabic numerals. The recognition of Chinese characters is very different from the recognition of letters and numbers, which increases the difficulty of recognition.

The suspension position of automobile license plate in China is not uniform;

In other countries, there is usually only one license plate format (such as the size of the license plate, the arrangement of characters on the license plate, etc. ), and in China, according to the different vehicles, models and uses, there are many license plate formats, which are divided into ordinary cars, embassy cars, police cars and military vehicles. And usually the license plate is divided into big cars and small cars;

There are many combinations of background color and character color of automobile license plates in China, such as white characters on blue background, black characters on yellow background, black characters on white background and so on.