Vehicle License Plate RecogniTIon (VLPR) refers to a technology that can detect vehicles on a monitored road surface and automatically extract vehicle license plate information (including Chinese characters, English letters, Arabic numerals, and number plates) for processing. License plate recognition is one of the important components of modern intelligent transportation systems, and it is widely used. Based on digital image processing, pattern recognition, computer vision and other technologies, it analyzes the vehicle image or video sequence captured by the camera to obtain the unique license plate number of each car, thus completing the identification process.
Through some subsequent processing methods, it can realize the functions of parking lot charge management, traffic flow control index measurement, vehicle positioning, automobile anti-theft, highway over-speed automatic supervision, red light electronic police, highway toll station and so on. It is of practical significance to maintain traffic safety and urban security, prevent traffic jams, and realize automatic traffic management.
The license plate number is the unique “identity†of the vehicle. The automatic license recognition technology can automatically register and verify the “identity†of the car without any modification. This technology has been applied to road toll, parking management, weighing. System, traffic guidance, traffic law enforcement, highway inspection, vehicle scheduling, vehicle detection and other occasions.
License plate recognition system installation process and precautionsA complete license plate recognition system includes a license plate recognition integrated machine, a parking lot charging display, a smart gate, and a license plate recognition software. Whether the installation of these devices is standardized or not greatly affects the performance of the entire license plate recognition system.
Before the license plate identification equipment is installed, it is necessary to carry out detailed surveys on the project site, understand customer needs, and formulate a complete construction process. Then, what factors should the installation process focus on?
1. Installation of license plate identification main equipment
1) First of all, to determine the installation position of the license plate recognition machine, which will directly affect the license plate recognition effect, which needs to be determined according to the site environment and conditions of each entrance and exit. Generally, one camera is installed in one lane. If the car enters the lane, the direction is not Fixed, if the angle is too large, it will affect the recognition. It is necessary to consider installing the sub-camera to ensure that the front of the car can be identified regardless of the bias.
2) Secondly, if you use snap capture, you need to determine the camera and coil mounting position: the optimal distance of the camera from the side of the coil to the car is 4-4.5m. The position of the coil should ensure that the direction of the front of the vehicle is biased towards the side of the camera when the vehicle is triggered, so that the camera can take a clear and complete picture. If it is a single channel (the entrance and exit are the same lane), a two-way vehicle checker is required.
If you use the video recognition mode, you do not need to install the ground coil and the car detector.
3) Then determine the position of the gate and anti-snaking coil: the gate is generally installed on the same side of the camera, located behind the camera (installed 30cm away from the camera pole to ensure that the gate can be easily opened). The position of the anti-snagging coil is centered directly below the gate bar. When the front end triggers the coil and the tail exits the coil, no part of the body is below the brake lever.
4) The camera and the gate should be installed on the solid ground. If the floor is brick or asphalt, consider pouring the concrete pier to reduce the stability. Before the above equipment is installed, it is necessary to determine the wiring mode of the line, and reserve the threading pipe in advance according to the installation position of the equipment. In order to ensure that the recognition effect is not affected by the speed of the vehicle, it is recommended to install a speed bump to control the speed.
2. License plate recognition accessory equipment
1) Configure the computer and server: The computer is usually placed in the export booth or in the duty room for charging.
The server chooses to be placed in the customer's office or booth according to customer needs. If you put it in the office, you need to deploy the fiber from the booth to the server. When surveying the site, you should estimate the distance from the fiber to the nearest booth and leave a margin. If the customer does not need to set up the server separately, use the booth machine as the server to install the database and FTP service.
2) The switch is selected according to the number of devices that need to be networked. Generally, Gigabit 8-port or 5-port switch is selected. The switch should be placed close to the booth or distribution box.
3) Making safety islands and guard posts: Set up safety islands according to needs and site conditions. Safety islands are generally constructed with concrete. The size of the safety island should ensure that the equipment such as the booth or the gate has sufficient installation space and does not affect the passage of the vehicle. The safety island should be pre-buried with the threading pipe when pouring. After the safety island is finished, it can be painted to increase the eye-catching effect.
The booth is generally installed at the exit of the parking lot for easy charging. The size is determined according to the size of the safety island or the installation location, but it must be ensured that there is enough space in the booth to accommodate the computer and other equipment and toll collectors.
4) The installation of the distribution box can be installed on the safety island or placed in the booth and in the duty room. If it is placed outdoors, the rainproof type should be selected and grounded.
3. License plate recognition construction materials
1) The power supply bus of the equipment uses the cable of not less than RVV3*1.5, and the integrated box and the integrated machine and the gate are grounded. The bus open power is selected according to the total power of all devices to prevent overload tripping.
2) When transmitting network data, use Category 6 network cable. When the transmission distance is greater than 100 meters, the fiber needs to be laid. Generally, single-mode fiber is used. At least one core is reserved for each fiber access point in the field. The total number of cores depends on the number of access points and the number of fused cores of each access point. determine. Shielded cable is used when transmitting 485 signals. When threading, the strong and weak lines must be separated.
3) Optical transceivers can use Gigabit single-mode dual-fiber type, and each pair of transceivers uses 2-core fiber. The specific model and quantity can be determined according to customer or project needs.
4) When the outdoor wiring is routed, the JDG galvanized iron pipe is protected and fixed. The buried pipeline is laid through the PVC pipe, and the indoor wiring is also protected by PVC pipe and fixed.
External Cable Assembly Wire:It is used to transmit data, audio, video, etc. it is a kind of electric energy or signal transmission device, which is usually composed of several wires or groups of wires.
External cable assembly line: used for connection, conduction, current and signal transmission of machine equipment, instrument, electronic and electrical peripheral equipment
External Cable Assembly Wire:It is used to transmit data, audio, video, etc. it is a kind of electric energy or signal transmission device, which is usually composed of several wires or groups of wires.
External cable assembly line: used for connection, conduction, current and signal transmission of machine equipment, instrument, electronic and electrical peripheral equipment
External Cable Assembly Wire
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