The parking lot smart license plate automatic recognition system is an application of computer video image recognition technology in vehicle license plate recognition. It has been widely used in parking lots, high-speed intersections, toll channels and other places. In the process of use, the parking lot smart license plate automatic identification system will inevitably have some problems. 1. The image output does not come out This situation should first carry out the following checks: whether the camera has image data output; the lens drive line is broken or The connection is correct. The connection between the camera and the control board is correct. Identify whether the system has image output and check whether the video line is connected to the recognizer analog video input interface.
2. Passing the car shows "No license plate"
Most of these failures are due to image input reasons. First check whether the license plate recognition camera is normal, whether the image is clear, and whether the position is moving. For the lane separated from the surveillance camera and the license plate recognition camera, the video head of the access recognizer can be connected to the character superimposer to observe whether the image is normal and adjust the camera.
3. The vehicle caught the coil and the software did not respond.
The main reason for this type of failure is that the IPC did not receive a trigger signal, and the license plate recognition host and billing software did not work. For such failures, see Coil and Snapshot Detector Repair Procedures.
4. The software displays "Geting license plate".
The reason for this type of fault is mainly the reason for the communication between the IPC and the license plate recognition host. First check whether the license plate reader is normally turned on and supply power. Second, check if the lane network is normal. Finally, please contact the system monitoring center to check the lane configuration file.
Parking lot smart license plate automatic identification system design and installation requirements:
I. Identification requirements:
Small license plate recognition (90-120 pixels), large license plate recognition (120-160 pixels). Full-resolution capture captures the on-the-spot vehicle's exposure and the width of the license plate (the size of the license plate can be displayed by the drawing software box).
Second, engineering principles:
Straight line distance: The straight distance from the camera lens to the outer side of the ground sense. Generally, the 5mm lens is about 5 meters, and the 4mm lens is about 4 meters.
Third, the project requirements:
1, one rack height: general standard in 1.5m-1.8m;
2. Camera column: Installed on the inside of the gate, about 50cm away from the gate; prevent the gate from catching the camera and affecting the recognition effect;
Wiring: network cable, power cable, ground sense switch signal line (connected to the car inspection output).
3, entrance and exit to sense location: one machine length occupy 0.5 meters, according to the Pythagorean law (a2+b2=c2) calculation:
1) The camera lens of a 5mm lens should be kept at a horizontal distance of about 4.3 meters from the brake lever. If the camera height exceeds 0.5 meters, it should be reduced by about 0.25 meters.
2) The camera lens of the 4mm lens should be kept at a horizontal distance of 3.2 meters from the brake lever. If the height exceeds 0.5 meters, it should be reduced by about 0.25 meters.
4. Deceleration belt position: Installed on the outside of the entrance and exit to about 1m, to ensure that the front of the car does not touch the ground. In order to prevent the owner from being too close to the car, a warm reminder card should be erected and kept at a distance of 3 meters.
5, fill light: column height of 0.6 meters, installed in the sense of the inner edge of 50cm-80cm (to maintain the license plate front fill light), by shooting on the floor coil can be reflected on the license plate to ensure the license plate recognition effect.
6, the monitor screen (bottom slope): Try to keep the license plate width and horizontal parallel, the maximum does not exceed 15 degrees.
With this system requirement, the requirements of the system for the on-site environment can be derived.
According to the problems encountered by other projects, the following points were specifically summarized:
1. When the vehicle enters the image capture area, the vehicle is facing the camera.
2. The place where the license plate recognition is installed should have sufficient straight-line distance to facilitate installation and debugging. The distance can be calculated as (vehicle length + camera recognition distance).
3. Avoid license plate recognition system equipment after turning 90°.
4, to avoid the installation of license plate recognition system equipment downhill.
5, to avoid the scene of chaos environment to install the system (many pedestrians, pedestrians often enter the vehicle access, easy to cover the license plate).
6, to avoid serious roads when the rain water road sewage (easy to block the license plate).
2. Passing the car shows "No license plate"
Most of these failures are due to image input reasons. First check whether the license plate recognition camera is normal, whether the image is clear, and whether the position is moving. For the lane separated from the surveillance camera and the license plate recognition camera, the video head of the access recognizer can be connected to the character superimposer to observe whether the image is normal and adjust the camera.
3. The vehicle caught the coil and the software did not respond.
The main reason for this type of failure is that the IPC did not receive a trigger signal, and the license plate recognition host and billing software did not work. For such failures, see Coil and Snapshot Detector Repair Procedures.
4. The software displays "Geting license plate".
The reason for this type of fault is mainly the reason for the communication between the IPC and the license plate recognition host. First check whether the license plate reader is normally turned on and supply power. Second, check if the lane network is normal. Finally, please contact the system monitoring center to check the lane configuration file.
Parking lot smart license plate automatic identification system design and installation requirements:
I. Identification requirements:
Small license plate recognition (90-120 pixels), large license plate recognition (120-160 pixels). Full-resolution capture captures the on-the-spot vehicle's exposure and the width of the license plate (the size of the license plate can be displayed by the drawing software box).
Second, engineering principles:
Straight line distance: The straight distance from the camera lens to the outer side of the ground sense. Generally, the 5mm lens is about 5 meters, and the 4mm lens is about 4 meters.
Third, the project requirements:
1, one rack height: general standard in 1.5m-1.8m;
2. Camera column: Installed on the inside of the gate, about 50cm away from the gate; prevent the gate from catching the camera and affecting the recognition effect;
Wiring: network cable, power cable, ground sense switch signal line (connected to the car inspection output).
3, entrance and exit to sense location: one machine length occupy 0.5 meters, according to the Pythagorean law (a2+b2=c2) calculation:
1) The camera lens of a 5mm lens should be kept at a horizontal distance of about 4.3 meters from the brake lever. If the camera height exceeds 0.5 meters, it should be reduced by about 0.25 meters.
2) The camera lens of the 4mm lens should be kept at a horizontal distance of 3.2 meters from the brake lever. If the height exceeds 0.5 meters, it should be reduced by about 0.25 meters.
4. Deceleration belt position: Installed on the outside of the entrance and exit to about 1m, to ensure that the front of the car does not touch the ground. In order to prevent the owner from being too close to the car, a warm reminder card should be erected and kept at a distance of 3 meters.
5, fill light: column height of 0.6 meters, installed in the sense of the inner edge of 50cm-80cm (to maintain the license plate front fill light), by shooting on the floor coil can be reflected on the license plate to ensure the license plate recognition effect.
6, the monitor screen (bottom slope): Try to keep the license plate width and horizontal parallel, the maximum does not exceed 15 degrees.
With this system requirement, the requirements of the system for the on-site environment can be derived.
According to the problems encountered by other projects, the following points were specifically summarized:
1. When the vehicle enters the image capture area, the vehicle is facing the camera.
2. The place where the license plate recognition is installed should have sufficient straight-line distance to facilitate installation and debugging. The distance can be calculated as (vehicle length + camera recognition distance).
3. Avoid license plate recognition system equipment after turning 90°.
4, to avoid the installation of license plate recognition system equipment downhill.
5, to avoid the scene of chaos environment to install the system (many pedestrians, pedestrians often enter the vehicle access, easy to cover the license plate).
6, to avoid serious roads when the rain water road sewage (easy to block the license plate).
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