What are the ways to implement license plate recognition?

For a city, how much the vehicle can measure the importance and status of the city, then this article will introduce to you how the license plate recognition is implemented. The identification of the vehicle license plate is based on image segmentation and image recognition theory. The image containing the vehicle number plate is analyzed to determine the position of the license plate in the image and to further extract and recognize the text characters.

What are the ways to implement license plate recognition?

The identification steps are summarized as: license plate location, license plate extraction, and character recognition. The three-step identification work complements each other, and each has a higher efficiency, and the overall recognition rate will increase. The speed of recognition speed depends on character recognition. The main application technique of character recognition is to compare the sample library, that is, to build a sample library for all characters. After character extraction, the character is judged by comparing the sample library, and the recognition process will be generated. The intermediate result value such as credibility and inclination; the other is the character recognition technology based on the character structure knowledge, which is more effective in improving the recognition rate and accuracy, and has stronger adaptability.

There are two main ways to implement the license plate recognition system: one is the identification of still image images, and the other is the real-time recognition of dynamic video streams. The recognition efficiency of static image recognition technology is limited to the capture quality of images. For single-frame image recognition, the current market recognition speed is 200 milliseconds. The recognition technology of dynamic video stream is more adaptable and faster. Fast, it realizes the recognition of each frame of video, increases the number of recognition comparisons, and chooses the preferred license plate number. The key is that it is less affected by the quality of single-frame image. The current product identification time is 10 milliseconds.

License plate recognition is widely used in highway vehicle management. In the electronic toll collection (ETC) system, it is also the main means to identify the identity of vehicles in combination with DSRC technology.

In parking lot management, license plate recognition technology is also the main means of identifying vehicle identity. In the "Technical Requirements for Vehicle Image and Number Plate Information Collection and Transmission System of Parking Garage (Field)" constructed by Shenzhen Public Security Bureau, license plate recognition technology has become the main means of vehicle identification.

The license plate recognition technology is combined with the electronic non-stop toll collection system (ETC) to identify the vehicle. When the passing vehicle passes through the crossing, there is no need to stop, that is, the vehicle identity can be automatically recognized and automatically charged. In the management of the yard, in order to improve the traffic efficiency of the entry and exit vehicles, the license plate recognition is for vehicles that do not need to collect parking fees (such as monthly trucks, free internal vehicles), and build an unattended fast-track, free of access and non-stop access experience. Change the management mode of access to the parking lot.

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