On August 20, the Ministry of Public Security introduced new regulations, and the car could be converted to a license plate number. Once the regulations were issued, they were recognized by the majority of owners. According to reports, since the implementation of inter-provincial transfer of traffic violation information, the “deck†problem has gradually emerged. Some car owners somehow received a traffic violation notice from a place they had never been to before. The introduction of the new regulations has removed the nuisance of the license plate for many owners. During road operation, road monitoring is the main tool for vehicle license plate recognition in traffic laws and regulations. Road monitoring is directly related to traffic enforcement.
First, the Ministry of Public Security: the car was the deck of the license plate can be changed for the country's strict investigation of license-related laws and regulations on August 20, the Ministry of Public Security clearly stipulated that determined to be the deck of the vehicle, you can cancel the use of deck during the traffic violations, The owner may also apply for a new number plate (using a new license plate number) and a driving permit. From yesterday to October 31, the Ministry of Public Security deployed nationwide to carry out centralized rectification of motor vehicle license-related license violations, centralized investigation and handling of counterfeiting, alteration, and use of counterfeit or altered motor vehicle license plates, driving licenses (referred to as "License cards" or other vehicle number plates, driving permits, deliberately obstructed, defaced number plates, and improper installation of license plates and other serious traffic violations.
The illegal information of decked cards can be revoked. According to the introduction, the discrepancy between the illegal vehicle and the decked vehicle was found to be obviously inconsistent with the evidence of the traffic illegal evidence, or the reporter could provide evidence to prove that the vehicle number plate was applied, and the public security traffic control department would revoke the regulations. Use the traffic violation information that occurred during the deck to prevent the vehicle from being influenced by the parties to apply for the inspection of the qualified mark, etc., and to renew the new license for the decked vehicle (using the new license plate number). In this way, if it is found that the use of the original license plate vehicle traffic violation, will be able to lock the deck car.
According to the introduction, regarding the renewing of new licenses, the parties concerned may, upon investigation, confirm that the motor vehicle has been decked, the parties may apply for a replacement motor vehicle license to the public transport administration of the vehicle registration authority on the acceptance slip issued by the public security administration of the case. If it is impossible to prove that the vehicle is decked, the parties may also apply to the traffic control department of the local citizenship for the replacement of the motor vehicle license. However, within six months of the re-issuance of a motor vehicle license plate, if the vehicle suspected of being illegally branded is still not seized, the traffic control department of the vehicle register will resume its original motor vehicle license.
In the event of a car registration incident, the parties concerned may report the case to the traffic control department of the public security department because of the vehicle being decked. The public security management department of the place where the vehicle is registered and the place where the violation occurred shall be accepted, and may not be refused or pushed for any reason. Where there are two or more prefectures where the illegal act occurs, the public security administration that first received the report will accept the case.
The Traffic Management Bureau of the Ministry of Public Security reminded the owners of the vehicle to protect their own vehicles and their card information and prevent the vehicle plate from being used or stolen. Any changes to the correspondence address and contact details shall be made to the Vehicle Administration Office in time for changes. Should also be checked regularly on the Internet, once it is found that they have not been to the place of the traffic violation notice, or found that the vehicle has been suspected of being decked, as soon as possible to the place of registration or the law-breaking public security authorities to report the case.
News background: involved in license-related illegal acts â—Ž Forged or altered motor vehicle number plates, driving licenses, driver's licenses.
â—Ž Use forged or altered motor vehicle number plates, driving licenses, driving licenses or other motor vehicle number plates or driving licenses.
â—Ž The motor vehicle on the road did not hang the number plate of the motor vehicle, or deliberately blocked or defaced and did not install the motor vehicle number plate according to regulations.
â—Ž Vehicles traveling on the road did not perform regular safety inspections as required.
â—Ž The motor vehicles on the road did not place inspection qualified signs and insurance signs, and did not carry the vehicle driving license or motor vehicle driving license.
â—Ž Vehicle drivers and driver's licenses are not carried by vehicles.
◎ The motor vehicle was not driven when the driver’s license of the motor vehicle was not obtained, the driver’s license of the motor vehicle was revoked or the driver’s license of the motor vehicle was suspended.
Since license plate recognition is so important, we must ignore the current status and problems of license plate recognition in the road system.
Second, road monitoring: the problem of license plate recognition system license plate positioning and character segmentation means to determine the location of the license plate in the captured image, extract the license plate image, and then segment the characters in the license plate. The difficulty in localization of the license plate area mainly comes from the collected images. Due to the diversity of the license plate images collected, and when the images are collected, it is affected by many factors, such as rain, fog, and light, resulting in some license plate image quality appearing to varying degrees. The difference, under normal circumstances, the background of the collected images is very complex, the captured image is a picture collected in high-speed motion, so the location of the license plate in the picture is not fixed, the size of the license plate is not the same, all of the above interference factors are The license plate area positioning and character segmentation brought difficulties, thus affecting the license plate recognition rate.
Contradictions between high resolution and recognition speed, from analog cameras to high-definition cameras, can also cause problems with high resolution and speed of recognition of images. The advantages of HD are self-evident, but everything is two-sided. When the license plate recognition is mainly reflected: HD pictures due to the wide coverage of the picture may appear in the picture at the same time a number of license plate recognition. This requires high speed for license plate recognition. The license plate recognition system may cause excessive processing flow for high-definition video streaming, and it may also cause problems due to the excessively high demand for the identification system resources. Leakage phenomenon, and it is difficult to achieve the accuracy of the vehicle capture rate and license plate recognition.
The adaptability of the license plate recognition system urgently needs to be strengthened. At present, the license plate recognition products in our country all require that the size of the identified license plate is fixed, while the license plates that are too large and too small can not be accurately identified. This poses the problem that some license plates cannot be identified in the event of video triggering. In addition, in some field environments, due to the influence of external conditions, the camera can not be set in the most reasonable position, which will cause the license plate in the picture to shift to different degrees.
The license plate recognition system does not have good recognition of defaced license plates. During the actual application process in highways and cities, it is difficult to ensure that the involved license plates are not defaced. After a license plate is used for several years, contamination and pollution are inevitable. Wear and other phenomena, but the vehicle driving on the road is also very difficult to guarantee that all are standard clean license plates, so in the actual environment, in the face of damaged old license plates, how to improve the recognition capabilities of the license plate recognition system is also a problem that needs to be solved. .
Third, the monitoring application: HD-SDI camera to help the transmission of license plate recognition along with the entire security industry to the high Chiang Kai-shek, and the continued promotion after the establishment of the HDcctv alliance, HD-SDI interface, more and more high-definition cameras into the eyes of the majority of users, And are widely used in urban road monitoring, highway road monitoring, justice, education, green video conference, sea surface monitoring, underwater monitoring, satellite emergency communications vehicles, sports venues refereeing enforcement systems and other fields. Combining experience and technology accumulation in the field of vision and imaging, the following will discuss the license plate recognition functions of HD-SDI cameras in urban road monitoring applications.
Road Surveillance Camera Requirements With the rapid development of video surveillance technology, the requirements for products in the video surveillance system for urban traffic security management are also increasing. The functional requirements are more perfect, the performance requirements are more stable, and the image quality requirements are more clear and accurate. Most of the traditional analog surveillance systems can only achieve the resolution of CIF (352×288) or 4CIF (704×576). Due to the low definition of the image and the limited viewing area, it can not meet the needs of a wide range of urban road conditions and high-definition monitoring. Therefore, high-definition is an inevitable trend of urban road monitoring and the inevitable trend of development.
Due to cost constraints, HD has not been effectively applied in the video surveillance industry. With the rapid development of chip technology and compression algorithms, the application of high-definition video surveillance products has gradually emerged. Now, the D1 SD video compression format has been officially written in the national standard of the DVR digital HD video recording system. HD video cameras and high-definition video codecs have also been gradually promoted and applied. The resolution can be up to 1920×1080, and the urban road video can be monitored. The high-quality HD video images provided by the system will bring significant improvements to urban public security monitoring.
Road Monitoring HD Camera Advantage Under the framework of high-definition surveillance technology, a high-definition camera can achieve the monitoring effect of several ordinary cameras. Its monitoring coverage is wider and wider, and the resolution of the image is higher and the amount of information is more abundant. High-definition monitoring can very effectively reduce the size of the system, avoiding cumbersome video images, control and power transmission lines. In addition, the front-end and back-end device configurations can be greatly reduced, thereby reducing overall construction costs. Therefore, high-definition surveillance technology will promote the construction of video surveillance systems to a intensive and efficient transition.
High-definition cameras use advanced photoreceptors to make the details of the images clearer and more detailed. The progressive scanning method can provide better image quality, effectively solve the comb blur caused by interlaced scanning, and also provide applications such as intelligent analysis. The favorable preconditions are of great significance for intelligent analysis applications such as license plates and face recognition.
The traffic monitoring system provides direct visual images to the command center. Usually, more than 70% of people's information comes from the visual. Commanders and relevant leaders can fully understand the actual traffic conditions and security status of major roads and key traffic intersections through display devices such as large screens and computers, and provide first-hand information for decision makers. In the event of an emergency, the event process can be watched on a large screen in real time, playback video can also be called, and the like. Therefore, the performance of the front-end camera section and the quality of its image signal will directly affect the system's real-time recording and real-time monitoring.
Road surveillance camera selection recommendations Based on the actual needs of high-definition video surveillance of urban roads, the following recommendations can be made when selecting cameras:
1, using CCD sensors. Currently, in the CMOS technology is not very mature, compared CCD and CMOS two kinds of photosensitive chips, CCD sensor in the sensitivity, resolution, noise control, high-quality image output, dynamic image performance is better than CMOS. Especially in the case of poor lighting conditions in urban roads at night, the imaging effect of CCD cameras is better than that of CMOS cameras. Therefore, it is recommended to use CCD as the CCD sensor for high-definition cameras.
2. In order to meet the needs of all-weather security surveillance, the camera should have a low-illumination function so that it can obtain clearer video images in evening and nighttime environments with low illumination.
3, high-definition video surveillance needs to achieve 720P/1080P resolution, progressive scan, the maximum frame rate should reach 25 frames / sec to ensure the smoothness of the video surveillance.
4. High-definition image transmission interface adopts HD-SDI interface that conforms to the standard of broadcasting and television and supports high-speed transmission of uncompressed video images. HD-SDI optical transceivers are used between high-definition digital cameras and high-definition encoding arrays to transmit uncompressed video images through optical fibers to ensure The high definition, low delay of the image, transmission without attenuation, and no interference also prevent the outdoor surveillance video image from being struck by lightning.
5, high-definition digital camera should have a high signal to noise ratio, high dynamic range, so as to ensure the quality of the image signal in different environments.
6, with automatic shutter, automatic gain, automatic white balance and other image preprocessing functions.
7, support for automatic iris lens, with a variety of zoom range electric lens to achieve different monitoring distance and range requirements.
8, support 485 communication agreement, can carry on the long-distance online upgrade to the camera, meet the special application environment to change the requirement of the parameter.
Attachment: Road video surveillance license plate recognition system maintenance services For the road capture system, most of the normal operation, maintenance and repair work done better, and the problem is the most out of the road auxiliary monitoring system, due to the peace of the city The construction scale of 100,000 cameras poses great challenges to the maintenance work, mainly in the following aspects: wide range, long distance, large scale; high maintenance cost; heavy construction, light service; short equipment life cycle .
Overall, there is still much room for improvement in the maintenance of road monitoring services. It can be considered from the following aspects:
• Sign maintenance contract: It is best for the user to sign maintenance service with a professional company. The maintenance cycle should be carried out at least once a year. For equipment that is easier to maintain (especially at the engine room), it should be done on a quarterly basis;
• Do a good job of lightning protection and grounding work: Lightning protection and grounding systems are not handled well. In those areas where lightning is frequent, it is very easy to cause equipment damage and failure.
• Establish an emergency maintenance mechanism: The construction of the monitoring system should have a self-alarm function. Once the equipment is in a fault state, the system should be able to automatically remind the operator. Once the operator finds a device failure, it should be handled for the first time to ensure the effectiveness of the monitoring system. This requires a comprehensive emergency maintenance system;
• Establish a sufficient stock of spare parts: Once the equipment fails, there must be enough spare equipment to use, otherwise it will take a long time to find the problem, and then spend a lot of time to purchase equipment and install equipment will waste a lot of manpower and material resources. ;
• Gradually improve the system through the problems found in the course of use: In the process of use, it may find that the blind area, sharpness, rationality of equipment configuration, and gradually optimize, gradually improve, and truly play the role of the monitoring system.
First, the Ministry of Public Security: the car was the deck of the license plate can be changed for the country's strict investigation of license-related laws and regulations on August 20, the Ministry of Public Security clearly stipulated that determined to be the deck of the vehicle, you can cancel the use of deck during the traffic violations, The owner may also apply for a new number plate (using a new license plate number) and a driving permit. From yesterday to October 31, the Ministry of Public Security deployed nationwide to carry out centralized rectification of motor vehicle license-related license violations, centralized investigation and handling of counterfeiting, alteration, and use of counterfeit or altered motor vehicle license plates, driving licenses (referred to as "License cards" or other vehicle number plates, driving permits, deliberately obstructed, defaced number plates, and improper installation of license plates and other serious traffic violations.
The illegal information of decked cards can be revoked. According to the introduction, the discrepancy between the illegal vehicle and the decked vehicle was found to be obviously inconsistent with the evidence of the traffic illegal evidence, or the reporter could provide evidence to prove that the vehicle number plate was applied, and the public security traffic control department would revoke the regulations. Use the traffic violation information that occurred during the deck to prevent the vehicle from being influenced by the parties to apply for the inspection of the qualified mark, etc., and to renew the new license for the decked vehicle (using the new license plate number). In this way, if it is found that the use of the original license plate vehicle traffic violation, will be able to lock the deck car.
According to the introduction, regarding the renewing of new licenses, the parties concerned may, upon investigation, confirm that the motor vehicle has been decked, the parties may apply for a replacement motor vehicle license to the public transport administration of the vehicle registration authority on the acceptance slip issued by the public security administration of the case. If it is impossible to prove that the vehicle is decked, the parties may also apply to the traffic control department of the local citizenship for the replacement of the motor vehicle license. However, within six months of the re-issuance of a motor vehicle license plate, if the vehicle suspected of being illegally branded is still not seized, the traffic control department of the vehicle register will resume its original motor vehicle license.
In the event of a car registration incident, the parties concerned may report the case to the traffic control department of the public security department because of the vehicle being decked. The public security management department of the place where the vehicle is registered and the place where the violation occurred shall be accepted, and may not be refused or pushed for any reason. Where there are two or more prefectures where the illegal act occurs, the public security administration that first received the report will accept the case.
The Traffic Management Bureau of the Ministry of Public Security reminded the owners of the vehicle to protect their own vehicles and their card information and prevent the vehicle plate from being used or stolen. Any changes to the correspondence address and contact details shall be made to the Vehicle Administration Office in time for changes. Should also be checked regularly on the Internet, once it is found that they have not been to the place of the traffic violation notice, or found that the vehicle has been suspected of being decked, as soon as possible to the place of registration or the law-breaking public security authorities to report the case.
News background: involved in license-related illegal acts â—Ž Forged or altered motor vehicle number plates, driving licenses, driver's licenses.
â—Ž Use forged or altered motor vehicle number plates, driving licenses, driving licenses or other motor vehicle number plates or driving licenses.
â—Ž The motor vehicle on the road did not hang the number plate of the motor vehicle, or deliberately blocked or defaced and did not install the motor vehicle number plate according to regulations.
â—Ž Vehicles traveling on the road did not perform regular safety inspections as required.
â—Ž The motor vehicles on the road did not place inspection qualified signs and insurance signs, and did not carry the vehicle driving license or motor vehicle driving license.
â—Ž Vehicle drivers and driver's licenses are not carried by vehicles.
◎ The motor vehicle was not driven when the driver’s license of the motor vehicle was not obtained, the driver’s license of the motor vehicle was revoked or the driver’s license of the motor vehicle was suspended.
Since license plate recognition is so important, we must ignore the current status and problems of license plate recognition in the road system.
Second, road monitoring: the problem of license plate recognition system license plate positioning and character segmentation means to determine the location of the license plate in the captured image, extract the license plate image, and then segment the characters in the license plate. The difficulty in localization of the license plate area mainly comes from the collected images. Due to the diversity of the license plate images collected, and when the images are collected, it is affected by many factors, such as rain, fog, and light, resulting in some license plate image quality appearing to varying degrees. The difference, under normal circumstances, the background of the collected images is very complex, the captured image is a picture collected in high-speed motion, so the location of the license plate in the picture is not fixed, the size of the license plate is not the same, all of the above interference factors are The license plate area positioning and character segmentation brought difficulties, thus affecting the license plate recognition rate.
Contradictions between high resolution and recognition speed, from analog cameras to high-definition cameras, can also cause problems with high resolution and speed of recognition of images. The advantages of HD are self-evident, but everything is two-sided. When the license plate recognition is mainly reflected: HD pictures due to the wide coverage of the picture may appear in the picture at the same time a number of license plate recognition. This requires high speed for license plate recognition. The license plate recognition system may cause excessive processing flow for high-definition video streaming, and it may also cause problems due to the excessively high demand for the identification system resources. Leakage phenomenon, and it is difficult to achieve the accuracy of the vehicle capture rate and license plate recognition.
The adaptability of the license plate recognition system urgently needs to be strengthened. At present, the license plate recognition products in our country all require that the size of the identified license plate is fixed, while the license plates that are too large and too small can not be accurately identified. This poses the problem that some license plates cannot be identified in the event of video triggering. In addition, in some field environments, due to the influence of external conditions, the camera can not be set in the most reasonable position, which will cause the license plate in the picture to shift to different degrees.
The license plate recognition system does not have good recognition of defaced license plates. During the actual application process in highways and cities, it is difficult to ensure that the involved license plates are not defaced. After a license plate is used for several years, contamination and pollution are inevitable. Wear and other phenomena, but the vehicle driving on the road is also very difficult to guarantee that all are standard clean license plates, so in the actual environment, in the face of damaged old license plates, how to improve the recognition capabilities of the license plate recognition system is also a problem that needs to be solved. .
Third, the monitoring application: HD-SDI camera to help the transmission of license plate recognition along with the entire security industry to the high Chiang Kai-shek, and the continued promotion after the establishment of the HDcctv alliance, HD-SDI interface, more and more high-definition cameras into the eyes of the majority of users, And are widely used in urban road monitoring, highway road monitoring, justice, education, green video conference, sea surface monitoring, underwater monitoring, satellite emergency communications vehicles, sports venues refereeing enforcement systems and other fields. Combining experience and technology accumulation in the field of vision and imaging, the following will discuss the license plate recognition functions of HD-SDI cameras in urban road monitoring applications.
Road Surveillance Camera Requirements With the rapid development of video surveillance technology, the requirements for products in the video surveillance system for urban traffic security management are also increasing. The functional requirements are more perfect, the performance requirements are more stable, and the image quality requirements are more clear and accurate. Most of the traditional analog surveillance systems can only achieve the resolution of CIF (352×288) or 4CIF (704×576). Due to the low definition of the image and the limited viewing area, it can not meet the needs of a wide range of urban road conditions and high-definition monitoring. Therefore, high-definition is an inevitable trend of urban road monitoring and the inevitable trend of development.
Due to cost constraints, HD has not been effectively applied in the video surveillance industry. With the rapid development of chip technology and compression algorithms, the application of high-definition video surveillance products has gradually emerged. Now, the D1 SD video compression format has been officially written in the national standard of the DVR digital HD video recording system. HD video cameras and high-definition video codecs have also been gradually promoted and applied. The resolution can be up to 1920×1080, and the urban road video can be monitored. The high-quality HD video images provided by the system will bring significant improvements to urban public security monitoring.
Road Monitoring HD Camera Advantage Under the framework of high-definition surveillance technology, a high-definition camera can achieve the monitoring effect of several ordinary cameras. Its monitoring coverage is wider and wider, and the resolution of the image is higher and the amount of information is more abundant. High-definition monitoring can very effectively reduce the size of the system, avoiding cumbersome video images, control and power transmission lines. In addition, the front-end and back-end device configurations can be greatly reduced, thereby reducing overall construction costs. Therefore, high-definition surveillance technology will promote the construction of video surveillance systems to a intensive and efficient transition.
High-definition cameras use advanced photoreceptors to make the details of the images clearer and more detailed. The progressive scanning method can provide better image quality, effectively solve the comb blur caused by interlaced scanning, and also provide applications such as intelligent analysis. The favorable preconditions are of great significance for intelligent analysis applications such as license plates and face recognition.
The traffic monitoring system provides direct visual images to the command center. Usually, more than 70% of people's information comes from the visual. Commanders and relevant leaders can fully understand the actual traffic conditions and security status of major roads and key traffic intersections through display devices such as large screens and computers, and provide first-hand information for decision makers. In the event of an emergency, the event process can be watched on a large screen in real time, playback video can also be called, and the like. Therefore, the performance of the front-end camera section and the quality of its image signal will directly affect the system's real-time recording and real-time monitoring.
Road surveillance camera selection recommendations Based on the actual needs of high-definition video surveillance of urban roads, the following recommendations can be made when selecting cameras:
1, using CCD sensors. Currently, in the CMOS technology is not very mature, compared CCD and CMOS two kinds of photosensitive chips, CCD sensor in the sensitivity, resolution, noise control, high-quality image output, dynamic image performance is better than CMOS. Especially in the case of poor lighting conditions in urban roads at night, the imaging effect of CCD cameras is better than that of CMOS cameras. Therefore, it is recommended to use CCD as the CCD sensor for high-definition cameras.
2. In order to meet the needs of all-weather security surveillance, the camera should have a low-illumination function so that it can obtain clearer video images in evening and nighttime environments with low illumination.
3, high-definition video surveillance needs to achieve 720P/1080P resolution, progressive scan, the maximum frame rate should reach 25 frames / sec to ensure the smoothness of the video surveillance.
4. High-definition image transmission interface adopts HD-SDI interface that conforms to the standard of broadcasting and television and supports high-speed transmission of uncompressed video images. HD-SDI optical transceivers are used between high-definition digital cameras and high-definition encoding arrays to transmit uncompressed video images through optical fibers to ensure The high definition, low delay of the image, transmission without attenuation, and no interference also prevent the outdoor surveillance video image from being struck by lightning.
5, high-definition digital camera should have a high signal to noise ratio, high dynamic range, so as to ensure the quality of the image signal in different environments.
6, with automatic shutter, automatic gain, automatic white balance and other image preprocessing functions.
7, support for automatic iris lens, with a variety of zoom range electric lens to achieve different monitoring distance and range requirements.
8, support 485 communication agreement, can carry on the long-distance online upgrade to the camera, meet the special application environment to change the requirement of the parameter.
Attachment: Road video surveillance license plate recognition system maintenance services For the road capture system, most of the normal operation, maintenance and repair work done better, and the problem is the most out of the road auxiliary monitoring system, due to the peace of the city The construction scale of 100,000 cameras poses great challenges to the maintenance work, mainly in the following aspects: wide range, long distance, large scale; high maintenance cost; heavy construction, light service; short equipment life cycle .
Overall, there is still much room for improvement in the maintenance of road monitoring services. It can be considered from the following aspects:
• Sign maintenance contract: It is best for the user to sign maintenance service with a professional company. The maintenance cycle should be carried out at least once a year. For equipment that is easier to maintain (especially at the engine room), it should be done on a quarterly basis;
• Do a good job of lightning protection and grounding work: Lightning protection and grounding systems are not handled well. In those areas where lightning is frequent, it is very easy to cause equipment damage and failure.
• Establish an emergency maintenance mechanism: The construction of the monitoring system should have a self-alarm function. Once the equipment is in a fault state, the system should be able to automatically remind the operator. Once the operator finds a device failure, it should be handled for the first time to ensure the effectiveness of the monitoring system. This requires a comprehensive emergency maintenance system;
• Establish a sufficient stock of spare parts: Once the equipment fails, there must be enough spare equipment to use, otherwise it will take a long time to find the problem, and then spend a lot of time to purchase equipment and install equipment will waste a lot of manpower and material resources. ;
• Gradually improve the system through the problems found in the course of use: In the process of use, it may find that the blind area, sharpness, rationality of equipment configuration, and gradually optimize, gradually improve, and truly play the role of the monitoring system.
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