What is the installation method of license plate recognition equipment in parking lot?

Abstract: Parking lot license plate recognition technology can be divided into indirect method and direct method. Indirect method is an automatic detection and identification method based on radio frequency identification technology; Direct method is a detection and recognition method based on image processing technology. A good license plate recognition system of intelligent parking lot system is very important to achieve recognition rate, installation effect and license plate capture effect in the early stage of equipment installation and technical requirements, especially the installation height, angle, stability and position of license plate recognition camera are very demanding. Let's take a look at how to install the license plate recognition equipment in the parking lot and the matters needing attention in the installation of the license plate recognition equipment in the parking lot. 1. What is the installation method of license plate recognition equipment in parking lot?

In the traditional parking lot, vehicles need to manually press the lifting lever button when entering and leaving, which leads to extremely slow traffic speed, not to mention the need for full-time guards and high labor cost. Generally speaking, the installation methods of parking lot license plate recognition can be divided into indirect method and direct method. Indirect method is an automatic detection and identification method based on RFID. Direct method is a detection and recognition method based on image processing technology. The parking lot license plate recognition system based on RFID is composed of tag, reader and antenna. The installation method is as follows:

1. Open the outer packing carton and check the accessories inside.

(1) display screen carton (two display screens, two columns, two production column bases, two universal joints and two buttons);

(2) Camera carton (two cameras, one of which is equipped with an encryption password, which has been indicated on the carton);

2. Install the license plate recognition machine.

(1) There are four hexagon socket head screws at the bottom of the display screen, then align them with the four holes on the column, and finally lock them;

(2) There are three hexagon socket screws at the top of the display screen, then align the universal joint with the hole position and finally lock it;

(3) The hole at the top of Vientiane Festival is aligned with the hole at the bottom of the camera to lock it (the hexagon socket head screw for locking the camera is in the box where the camera is installed);

(4) Identify and locate the license plate, and then draw holes under the column (pay attention to adjust the appropriate angle);

Step 3 punch holes

License plate recognition to the gate, to the computer and other places slot buried PVC pipe;

Step 4 connect wires

(1) Each camera must be equipped with an eight-core network cable to the switch, and then from the switch to the computer;

(2) Connect a 220V power supply to the LN of the camera power supply;

(3) A dual-core communication line AB is connected to the AB of the display motherboard (AB cannot be connected reversely);

(4) The road brake is connected with a 4-core opening and closing cable (two-core cables are enough if the closing function is not needed, and some cameras do not support the closing function, please consult technicians for details);

(5) The line displayed to the camera is covered with a black hose, which is installed in the camera box with one end fixed on the chassis and the other end fixed on the camera;

6, road brake wiring

(1) is turned on and connected with 220V power supply;

(2) the main board and the switch wire connected to the camera;

(3) Connect the public line and the closing line of the camera (optional);

(4) Pin 3 and Pin 4 of the detector are grounded;

7, detector wiring

(1) Common * * * and sense of the earth of 3-pin and 4-pin grounding door motherboards;

(2)7, 8 feet embedded grounding circuit;

(3) 1 pin and 2 pins are connected with 220V power supply;

Second, the parking lot license plate recognition equipment installation matters needing attention

In recent years, with the continuous progress of the economy, the number of cars in China has started to increase rapidly, and urban traffic problems are constantly affecting our work and life. With the development of science and technology, the intelligent license plate recognition system of parking lot is gradually entering our daily life. Through the license plate recognition technology for parking lots, it can not only alleviate the congestion problem of major parking lots in peak season, but also reduce the labor cost of parking lots and improve the automation degree of parking lot management. Parking lot license plate recognition installation needs to pay attention to the following aspects:

1, road isolation requirements

The motor vehicle lane and non-motor vehicle lane are strictly separated to ensure the specificity of the lane. The advantage is that pedestrians and non-motor vehicles are not allowed to block the license plate image taken by the all-in-one machine, which affects the license plate recognition result. But also ensures the vehicle running track and the effectiveness of the license plate recognition integrated machine recognition when the vehicle runs and triggers the ground loop.

2. Distance from the cylinder to the edge of the island

The distance from the center of the column to the edge of the toll island is required to be less than 0.5m, and 0.3m is recommended. The camera should be installed on one side of the monitored lane, but the camera should be as close to the lane as possible, and the included angle between the camera and the lane should be as small as possible. Because the farther the camera is from the driveway, the greater the angle between the camera and the driveway, which will make the license plate in the video tilt or distort, which is not conducive to identifying and capturing.

3. Installation height of camera

The height of the camera from the driveway should not be less than1.1m. Generally, the camera bracket is installed on the steps next to the driveway, so the height of the bracket should not be too high, depending on the specific situation. The camera is too low, and the vehicle in the video does not move up and down, which affects the capture and recognition.

4. Installation position of camera

If the identification integrated machine is used for video monitoring and anti-theft card detection of toll lanes, it needs to be installed on the roadside parking toll collection system. The distance between the upright post and the front edge of the front coil is more 1 m than when it is installed on the same side.

5. Unable to stop the video.

There should be no obstacles in front of the license plate capture machine to ensure the integrity of the vehicle video picture, otherwise it will affect the capture recognition. For the lane with a guardrail, a camera should be installed in front of the guardrail to ensure that the license plate of passing vehicles will not be blocked by the landing pole of the guardrail; However, the camera should be as close as possible to the hurdle machine, so as to ensure that the license plate is in the detection area when the car stops, and the license plate will not become too big because it is too close to the camera. The specific location of camera installation should be adjusted according to the scene environment and lens focus.

6, cloth tube threading

In order to facilitate the wiring between devices, that is, the appearance of the whole system is beautiful, all wiring between devices should be connected by pipes, and the pipes connecting devices should be embedded under the island surface. The conduit is embedded in the concrete safety island, so it is recommended to use PVC conduit, which has no corrosion and is easy to thread because of the slippery wall.

7. Adjust the lens to ensure that the license plate is clear.

(1) Rotate the focus ring and adjust it to the appropriate focal length (the car should be as large as possible in the whole image);

(2) Rotate the focus ring, and the image edge will gradually become clear. At this point, slow down the adjustment speed until it becomes blurred. Then the focus is completed when it is slightly reversed to the clearest position;

(3) Adjust the aperture to the maximum position. If the aperture is too small, the brightness of the image will be too dark;

(4) After the final adjustment, take the snapshot machine and the inner container out of the protective cover and lock the focusing ring and the focusing ring. Then put the camera and the inner container into the protective sleeve, then fix them in the protective sleeve with self-tapping nails, and place the focusing and focusing ring for fine adjustment, because the picture is not clear due to vibration. The focusing process needs to be adjusted and compared repeatedly until the license plate recognition machine captures the clearest image.

Third, the requirements for the installation of license plate recognition equipment in different environments

1. Install the license plate recognition system on the straight road.

The straight driveway of the parking lot is an ideal installation environment, and vehicles can get high-quality photos when they drive into the identification area.

(1) During construction, the license plate recognition system and the road gate can be installed on the same side of the driveway, but the license plate recognition system should be installed in front of the road gate with a distance of not less than 30cm to prevent mutual interference between devices.

(2) When selecting snapshot recognition and video recognition, the distance between the ground loop and the all-in-one machine is 4m.

(3) When selecting the video plus ground sense recognition form, the interval between the ground loop and the all-in-one machine is 3m.

2, wide lane installation license plate recognition system

If vehicles are coming from two directions, double cameras can be installed, and each camera can shoot vehicles coming from one direction.

(1) If the lane is particularly wide and the direction of the vehicle is not fixed, the front of the vehicle will be skewed left and right when the vehicle enters, which will simply affect the recognition effect. Obstacles such as cones and road stakes can be used to divide two lanes into a non-motor vehicle lane, so that the motor vehicle lane will be narrowed and the direction of vehicles will be straight.

(2) If the lane is wide, but it can't be divided into two lanes or a non-motorized lane can be added, in this case, two cameras can be installed, that is, a license plate recognition machine can be installed on both sides of the lane, so that no matter which direction the vehicle leans, one camera can take the license plate and recognize it.

(4) If the driveway is very short, when the car comes from a certain direction, the car body generally leans to one side. In this case, the camera can be installed on the inclined side of the front of the car, so that the front of the car is facing the camera when shooting.

3. Install the license plate recognition system at the corner.

When installing a license plate recognition device in a curve, the direction of the vehicle is pointing to the outside of the curve, so a license plate recognition system should be installed outside the lane, so that when the vehicle enters the recognition area, the superior parking camera can take more correct license plate photos.

4. Install the license plate recognition system in the basement.

When the license plate recognition system is required to be installed in the basement, the following standards should be followed: the imported license plate recognition system should be installed on the horizontal road above the basement ramp, and the exported license plate recognition system should be installed on the horizontal ground below the basement ramp, so as to prevent the problem that vehicles can only park on the basement ramp when the all-in-one machine cannot recognize the license plate and the guardrail cannot lift the pole.