Intelligent traffic to solve congestion: how to identify the application of technology
Intelligent transportation is the forefront of the development of the international transportation field today. It promotes the integration and integration of information, communication, control, new energy and automotive technologies on transportation platforms. It has caused revolutionary changes in all aspects of the transportation field.
Intelligent traffic to solve congestion: how to identify the application of technology
Application prospects of the intelligent transportation industry
The intelligent transportation industry has a wide range, and the efficient operation of roads, water transportation, shipping, rail transit and other networks requires systems with related functions to support them. This article focuses on the highway intelligent transportation system mainly used in: interprovincial highway traffic management, urban road traffic management, urban public transportation management and other fields.
1. Interprovincial highway traffic management
Interprovincial highway traffic management mainly includes: highway management and highway management systems between national highways and provincial highways. At present, the main application system is the charge management system. During the implementation of the National Expressway Networked Non-stop Toll Collection and Service System (ETC) of the National Science and Technology Support Program, the country has issued relevant technical standards. At present, the standard has been recognized by international companies such as the United States and Japan. In the near future, the ETC system will be networked in regions and even nationwide. At present, the demonstration project of the project has started construction in the Yangtze River Delta and Beijing-Tianjin-Hebei regions.
2. Urban Road Traffic Management
The urban road traffic management system is an important part of the intelligent traffic system. Urban transportation needs to involve the cooperation of multiple departments such as traffic management, construction, and public security in the city. Therefore, it is necessary to build an efficient and convenient information sharing platform. The traffic management platform will also be part of the emergency linkage system currently under construction in many cities, and will play a corresponding role in the emergency command of urban emergencies.
The urban road management system also includes signal light control system, road condition indication system, license plate recognition system, road video monitoring system, etc. The signal light control system and the road condition signboard mainly help the management department and the vehicle to better understand the road condition, so as to carry out the most reasonable road management and road selection, and improve the efficiency of road transportation. In addition to improving the efficiency of road transportation, the license plate recognition system and road video monitoring system also play a role in the monitoring of urban security. The road video surveillance system is the most widely used system among the above systems. In the construction of "safe cities" in many cities, road video surveillance has been included in the scope of construction.
3. Urban Public Transportation Management
The urban intelligent public transportation system is an intelligent system mainly aimed at the command, management, dispatching, emergency, etc. of public transportation within the city. The urban intelligent public transportation system mainly realizes comprehensive monitoring of urban public transportation lines, stations and vehicles. Foresee and rationally arrange bus resources through various auxiliary equipment to optimize the bus system. In addition, the intelligent public transportation system can also cooperate with the road traffic management system to realize the established urban traffic strategy. For example, during the Beijing Olympics, GPS was used to locate the bus, and it cooperated with the signal light remote control system to implement the "bus priority" traffic strategy.
The development of intelligent transportation system in China is not perfect, there are still many fields to be developed in the future, the market prospect is broad, and it will continue to show a trend of rapid growth in a long period of time.
How to identify technical applications
1. What are the functions of the current security bayonet solutions provided by various manufacturers? What are their characteristics? What problems have been solved?
The security bayonet system is also called the vehicle intelligent monitoring and recording system. Its main function is to automatically collect and process vehicle information on the monitored road surface. According to the above explanation, it can be explained that the most important functions of the security bayonet equipment are: automatic vehicle capture and automatic license plate recognition. A reliable and stable security bayonet system, the key indicators are: vehicle capture rate reaches 99%, license plate recognition all-day recognition accuracy rate exceeds 95%, and it should also have the following functions:
1) Adopt the vehicle-capturing mode with ground sense coil as the main and video trigger as the auxiliary. Unlike the traditional system, the video trigger function is added to make up for the deficiencies of the original single trigger mode that rely on the ground sense coil alone to ensure that the bayonet can normally trigger the capture of passing vehicles when the ground sense coil is damaged. The public security system provides real-time, 24 hours uninterrupted complete data.
2) Add body color recognition function. The body color recognition function provides new query and comparison methods for machine query and layout control, as well as vehicle detection. The more colors recognized, the more accurate the judgment. At present, the systems of many excellent manufacturers have the function of recognizing 9 body colors, including: white, gray (silver), yellow, pink, red, green, blue, brown and black. At the same time, it can also recognize the dark and light colors of the body color.
3) The facial features of the driver and passengers in the front row of the vehicle can be seen clearly. The use of professional and excellent image clearing algorithms and fill-in light means that the captured pictures can clearly see the facial features of the passengers and passengers in the passing vehicles, providing effective evidence for criminal investigation and public security.
4) High license plate recognition function. System providers with rich experience can achieve a high license plate recognition rate, and the all-day license plate recognition rate is over 95%. This can provide reliable basic data for real-time alarm and machine query of black car deployment.
2. In the process of building an intelligent security bayonet, how should front-end equipment be purchased? Are there clear standards?
According to the latest national security bayonet standard GA / T497-2009 "General Technical Conditions for Highway Vehicle Intelligent Monitoring and Recording System", the vehicle capture rate should be over 99%, the license plate recognition rate should be over 90% during the day and over 80% at night.
According to the above requirements:
There are three ways to capture vehicles: ground sense coil, video trigger, and radar trigger.
At present, only the ground sense coil mode can meet the requirements of the national standard. If the ground sense coil trigger source is used alone, the ground sense coil damage is equivalent to the paralysis of the lane, and the normal snapshot cannot be taken. Domestic excellent manufacturers generally use the ground sense coil as the main method, and the video trigger as the auxiliary trigger mode to ensure that the video trigger can be used as a backup mechanism when the ground sense coil is damaged. It can basically ensure normal capture before the ground sense coil is repaired.
Front-end equipment selection: According to the requirements of the above national standards, to achieve high recognition rates, the front-end camera must use a high-definition camera. At present, the use of 2MP high-definition smart cameras with snap capture and recognition can complete the work of license plate recognition, body color recognition, video triggering, etc. directly in the camera, simplifying the overall structure of the system equipment, which is more stable than using the industrial computer recognition mode. High integration and easy maintenance.
3. In addition to high-definition, are there any new technologies for the security bayonet? How can the best performance be achieved during the use of the equipment?
The security bayonet system has developed from the earliest standard-definition security bayonet era to the current application trend of high-definition security bayonet, and the technology has been constantly updated. In recent years, it should still be the mainstream application of high-definition camera capture. If there is a clearer and more accurate way than the high-definition camera in the future, I think it will develop in this direction.
How to achieve the best performance of the security bayonet equipment depends mainly on two aspects: 1. The accuracy of the front-end data collection and the stability of the overall architecture of the equipment; 2. Whether the functions of the security center management platform of the command center are perfect and whether it can meet the public security command And the actual requirements of criminal investigation.
Security bayonet equipment is mainly for basic data collection, including vehicle capture, automatic license plate recognition, vehicle speed measurement, body color, vehicle passing time, location and other related data. The above technical data is transmitted back to the command center through optical fiber, and the data management and comparison analysis are carried out through the security bayonet platform. From this point of view, a good security bayonet equipment, not only the accuracy of the front-end equipment function capture rate, license plate recognition rate is higher, the command center's security bayonet management software is powerful and the most important.
4. What is the focus of the future development of security bayonet?
1. The technology of capture methods is constantly evolving. At present, the most stable and highest capture rate is the ground sense coil. The future focus is to find a technology that can achieve higher capture rate and stability and lower cost than the ground sense coil.
2. Technical improvement of the fill light method. You can see the supplementary light technology of the facial features of the driver and passengers in the car while reducing light pollution and minimizing the impact on the driver.
3. Development of vehicle identification algorithms. The future development direction of this aspect is not only to recognize the license plate, but also to identify that the vehicle passing through the bayonet is a certain brand, such as the Volkswagen brand, the Toyota brand, etc., to provide effective information for the public security criminal investigation in the investigation and control of the vehicle license .
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