Vehicle license plate recognition based on machine vision is more automated and intelligent

Before mentioning automation or intelligence, people will unconsciously think of industrial production. This is because the word automation has entered China and it is indeed based on the industrial field as a landing platform. However, with the progress of the times, automation is no longer limited to the industrial field, but widely exists in various fields, even closely related to our lives. The intelligent transportation system is the product of scientific and technological development in the transportation field. Whether it is to take photos of the monitoring of road vehicles or the electronic automated toll system in the field of highway tolls, it is an intelligent performance. At the same time, it is not difficult to find that no matter where the intelligent transportation system is applied, it is realized through the recognition of the vehicle license plate, and the current vehicle license plate recognition system based on machine vision is the most automated and intelligent .

Just like a citizen ’s identity document, a vehicle license plate is a vehicle ’s identity certificate and is the most authentic and clear sign. The vehicle license plate recognition system can automatically acquire the dynamic data during the vehicle's traveling process, accurately recognize the characters of the vehicle license plate, and perform fast judgment and processing. The vehicle license plate recognition system based on machine vision mainly includes image acquisition and processing, license plate location, character segmentation and recognition.

One: image acquisition and processing

The main function of the machine vision system is to convert the captured object into an image signal, which is then converted into a digital signal by the image processing system, and finally perform various operations based on these signals to extract the characteristics of the target for comparison. Then, the vehicle license plate recognition system based on machine vision can convert the license plate image from an analog signal to a digital signal, enhance or transform the license plate image through image processing, highlight the main characteristics of the license plate, and lay a solid foundation for the next license plate positioning .

Second: License plate positioning

License plate positioning is the key point of the vehicle license plate recognition system based on machine vision, and it is also difficult. Noise and so on will affect the accuracy of positioning. It mainly includes several processes such as image preprocessing, coarse positioning of vehicle license plates, and precise positioning of vehicle license plates. Image preprocessing is mainly to distinguish the information that has become electrical signals, remove the noise and impurity signals in the signal, and standardize the text format, so that the obtained information becomes organized. The role of the rough positioning part of the license plate is to roughly select several candidate license plate areas to be judged and identified to narrow the judgment range for accurate positioning. Finally, the precise positioning of the license plate can determine the real area from the candidate area and give the corresponding coordinates.

Third: Character segmentation and recognition

The character segmentation of the vehicle license plate is to segment each character in the positioned license plate area from the entire image, making it a single character, so as to facilitate character recognition. The character recognition is the most important and final purpose of the vehicle license plate recognition system based on machine vision. It will recognize the results obtained by all the previous links, and finally obtain the required clear and accurate vehicle license plate characters.

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