Principle of HD License Plate Recognition System - Tigerwong

Schematic diagram of license plate recognition system; License plate recognition PTZ camera captures license plate through light suppression shielding, electronic shutter adjustment and wide dynamic functions: strong light shielding: on the basis of low illumination color camera, the brightest part of the image is blocked through the function of software. In traffic monitoring, the strong light of headlights can be blocked, so as to capture the license plate clearly. However, the biggest disadvantage of this camera is that the software can not distinguish clearly, and the brightest part of the image is not clearly defined. It may also block the license plate number, and can not handle the capture of high-speed moving objects. At present, domestic cameras do more in strong light shielding, and the effects are different from each other.

Adjustable electronic shutter: for capturing objects moving at high speed (the vehicle speed on the highway is generally more than 70km / h), clear capturing can be realized by reducing the electronic shutter speed, which is generally adjusted manually. However, the biggest problem with this method is that the illumination is different during the day and at night. Two shutter speeds must be set to adapt to the monitoring during the day and at night. Wide dynamic function: This is the best way to solve the impact of lights on capture. Wide dynamic was first proposed by Panasonic.

When the background light is too bright, the ordinary camera can not solve the problem of light and dark image display. As the most important means to determine vehicle identity in the field of intelligent transportation, license plate recognition technology has played a great role in realizing traffic intelligent management. License plate recognition technology has penetrated into all kinds of work. 1 Monitoring and alarm for vehicles included in the "blacklist", such as wanted or reported missing vehicles, unpaid vehicles, vehicles without annual inspection, hit and run vehicles and illegal vehicles, just input their license plate number into the application system, and the license plate recognition equipment shall be installed at the designated intersection, checkpoint or carried by law enforcement personnel at any time as needed, The system will read the license plate numbers of all passing vehicles and compare them with the "blacklist" in the system. Once the specified vehicle is found, an alarm message will be sent immediately. The system can work continuously all day without fatigue and has a very low error rate; Can adapt to high-speed vehicles; It can complete the task during vehicle operation without affecting normal traffic; In the whole monitoring process, the driver will not be aware of it and has high confidentiality.

The application of this system will greatly improve the efficiency of law enforcement. 2 Penalty for speeding violation: license plate recognition technology combined with speed measuring equipment can be used for penalty for vehicle speeding violation, which is generally used for expressway. The specific application is: set up speed monitoring points on the road, capture speeding vehicles and identify the license plate number, and send the license plate number and pictures of illegal vehicles to each exit; Set penalty points at each exit, identify passing vehicles with license plate recognition equipment, and compare the number with the number of speeding vehicles received. Once the number is the same, start the warning equipment and notify the law enforcement personnel for handling. Compared with the traditional overspeed monitoring method, this application can save the police force, reduce the work intensity of law enforcement personnel, and is safe, efficient and hidden. Drivers need to remind themselves not to overspeed at all times, which greatly reduces the accidents caused by overspeed. 3 Vehicle access management: install the license plate recognition equipment at the entrance and exit, record the license plate number and access time of the vehicle, and combine it with the control equipment of automatic door and railing machine to realize the automatic management of the vehicle.

Applied to the parking lot, it can realize automatic time charging, automatically calculate the number of available parking spaces and give tips, realize the automatic management of parking charging, save manpower and improve efficiency. Applied to the intelligent community, it can automatically judge whether the incoming vehicles belong to the community, and realize automatic timing and charging for Non internal vehicles. In some units, this application can also be combined with the vehicle dispatching system to automatically and objectively record the departure of the vehicles of the unit. H3 Zhi adopts the license plate recognition technology in the traffic management system to achieve no parking and no card collection, and effectively improve the efficiency of vehicle access. 4 Automatic release: input the specified license plate information into the system, and the system will automatically read the license plate of passing vehicles and query the internal database. For vehicles requiring automatic release, the system drives the electronic door or railing machine to pass through, and other vehicle systems will give warnings and be handled by the personnel on duty.

It can be used in special units (such as military management zone, confidentiality unit, key protection unit, etc.), road and Bridge toll checkpoints, senior residential areas, etc. 5 Expressway toll management installs license plate recognition equipment at each entrance and exit of the expressway. When the vehicle enters, it recognizes the vehicle license plate, stores the entrance data in the toll collection system, recognizes the license plate again when the vehicle arrives at the exit, calls the entrance data according to the license plate information, and realizes toll management in combination with the entrance and exit data. This application can realize automatic billing, prevent cheating and avoid the loss of accounts receivable. Expressway has begun to implement networked charging. With the expansion of networking scope, the charging difference of different models is becoming higher and higher.

The problem of drivers using the loopholes of the existing charging system to evade fees by changing cards halfway will become more and more prominent. The use of license plate recognition technology is the fundamental method to solve this problem.