Machine vision technology is widely used in vehicle license plate recognition

   With the development of the new era, many major parking lots in residential areas, commercial plazas, shopping malls, airports, etc. have been transformed from the traditional card-swiping parking system to an intelligent license plate recognition parking lot system. Intelligent license plate recognition The most outstanding performance of the technology is its application in parking lots. Because of its high recognition rate and fast traffic, it has been favored by many users.

  For vehicle license plate recognition based on machine vision technology, the entire processing process is divided into five modules: preprocessing, edge extraction, license plate positioning, character segmentation and character recognition. Software programming is used to implement each part, and finally the car license plate is recognized . It is mainly used in urban traffic management, highway toll management, highway overrun management, etc. In the traditional high-definition system, the system sends the pictures taken by the camera to processing systems such as industrial computers for identification, processing, storage and other operations. This places very high requirements on transmission and processing equipment, and it is difficult to meet the design processing capacity requirements of the system.

        Each lane is equipped with a 2-megapixel high-definition smart camera with a resolution of up to 1600x1200 pixels. It is responsible for capturing the facial features of the front-seat drivers and passengers, automatic recognition of license plates, and automatic recognition of body color, and sends the processing results through Ethernet. To the smart HD camera terminal server.

        The terminal server adopts an embedded Linux dedicated system and is responsible for receiving, storing and uploading vehicle traffic information. At the same time, users can view and manage all front-end devices through the terminal server. Each smart high-definition camera terminal server can connect to up to 20 smart high-definition cameras at the same time, which is extremely convenient. Greatly improve system processing performance. The intelligent high-definition camera integrates an industrial-grade progressive scan CCD and a high-speed DSP chip to independently complete the entire image capture, license plate recognition, body color recognition, vehicle speed acquisition and other functions. After the vehicle information is acquired, the result assembly and communication module packages and uploads it through Ethernet. Terminal server enhances system processing capabilities, making the system structure clear and concise, and easy to expand.

        The entire imaging system is a sophisticated system composed of intelligent high-definition cameras, intelligent fill lights and imaging control software. The orderly cooperation and feedback control between them make the vehicle images captured during the day and night high-definition, ensuring that the body, license plate and The facial features of the driver and passengers in the front row of the vehicle are clearly identifiable.

         At the same time, the system integrates the light reflection characteristics of the vehicle's front windshield, the film application, and the ambient light exposure. It adopts a special lens, a specialized imaging control strategy, and a fill-in light method. It also arranges a reasonable equipment layout, so that The system can effectively solve problems such as front windshield reflection and direct strong light for all types of vehicles around the clock, ensuring that the body, license plate, and facial features of the vehicle's front-row drivers and passengers are clearly identifiable. It can also automatically identify the shade of car body color and 10 common car body colors, providing new technological means for public security inspections and criminal investigation cases.

         Nowadays, the license plate recognition parking lot system is currently considered to be a parking lot management system that is more convenient to manage and has faster vehicle traffic. The application of the vehicle license plate recognition system based on machine vision technology has become an urgent need for intelligent traffic management. Provide strong technical support for the development and progress of the industry.

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