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The key to “Smart Dispatching of Mobile Video Element Information†is feature information and intelligent dispatch display. "Factor information" refers to information related to security, security tasks, or the attention of the commander, such as the vehicle information (license plate, vehicle speed, etc.) in the execution of the task, the name or code of the task, clock information, starting and ending positions, The current geographical location, driving distance, and remaining time of the vehicle; “smart scheduling display†refers to the fact that the above-mentioned element information can be automatically collected and pushed to the dynamic video display in the moving video screen, thereby replacing the manual acquisition of security information in the past. Truly, the commanders can make direct command decisions without inquiring and at a glance, so as to achieve the purpose of “letting the image speakâ€. 
*Discussion on Application of Intelligent Dispatching Display Technology for Mobile Video Element Information
Focusing on the actual needs of policing operations, and focusing on the deficiencies and limitations in the development of mobile video, an intelligent dispatching display technology for essential information based on mobile video was proposed. The affiliated vehicle information (vehicle speed, license plate, etc.), security mission name, time information, and current Elements such as vehicle location and distance from destination are comprehensively displayed on the mobile video screen so that the rear headquarters can perform synchronous monitoring and scheduling to solve the single problem of traditional mobile video applications and improve the effectiveness of policing communication command and dispatch.
I. Introduction
In recent years, local authorities have been promoting the construction of mobile video applications while vigorously advancing the development of video surveillance systems. As mobile video has excellent mobility and flexibility, it can effectively supplement fixed cable monitoring and meet multiple levels. The need for video dispatch guarantees has become an important means of emergency communications for agencies, and has played an important supporting role in all types of policing work. However, with the rapid development of business requirements, existing simple mobile video viewing applications have been difficult to meet actual combat needs. How to further enrich the amount of information in mobile video screens by researching and applying relevant analysis algorithms on the basis of existing technologies The realization of smart scheduling of mobile video has become an important issue in the current mobile video applications that urgently needs research and solutions.
Second, the status of mobile video applications
At present, the cable video surveillance system has developed to a certain scale, and mobile video has been actively promoted as an important auxiliary means for cable video surveillance. The Department issued the "Opinions on Further Implementing the Urban Alarm and Monitoring System Application Work" issued in April 2010. It clearly stated that: “In order to adapt to the anti-terrorism and emergency handling requirements, a certain number of portable wireless transmission video monitoring equipment should be reserved...†According to actual needs, various mobile video systems at all levels have been established, such as static Zhongtong and Dongzhong Satellite Communication System, *340MHz wireless image transmission system, 3G, 4G public network (special network) mobile image transmission system, etc., have played an important role in the work. However, with the rapid development of business needs and video information technology, we are clearly aware that the current application of mobile video basically stays at the level of a single video information acquisition and real-time upload display. The information provided is pure video at the event site. Or audio-based, although the screen information has been able to basically reflect a certain scene, but the content of the information reflected is not comprehensive enough, for example, the geographical location of the incident, dynamic information related to the moving target, etc. are unknown, but also from the first The three parties asked the auxiliary information and then carried out the command and dispatch in combination with the mobile video. The security commanding department at the rear had the inconvenience of grasping the information of the whole party in time, which affected the efficiency of the command and dispatch and even delayed the fighter. Therefore, combined with the actual needs of policing, today's rapid development and application of positioning, navigation, and video analytics technologies, the development of * mobile video intelligent applications have met with favorable conditions both in terms of subjective and objective, and require the technical department to actively study and promote Landed.
Third, mobile video element information intelligent scheduling display technology
(a) The basic concept
(B) the key technologies needed to use
The intelligent dispatching display of mobile video element information involves technical research in many fields. The most critical are the following four technologies: front-end information acquisition of OBD vehicle-mounted diagnostic system, inverse analysis of position and navigation information, mileage verification algorithm, and data Reverse push dynamic projection technology. Let us discuss the implementation of these technologies.
1. Front-end information acquisition of OBD vehicle diagnostic system
(1) On-Board Diagnostic System (OBD) Information
OBD is the abbreviation of On-Board Diagnostic in English. It is translated in Chinese as “Onboard Diagnostic Systemâ€. The OBD device monitors multiple automotive systems and components including engine, catalytic converter, particle trap, oxygen sensor, emission control system, and fuel system. , EGR and so on. OBD is connected to an electronic control unit (ECU) through various emission-related component information. The ECU has the function of detecting and analyzing discharge-related faults. When an emission failure occurs, the ECU records the failure information and related codes and issues a warning through the failure lamp to inform the driver. The ECU guarantees access to and processing of fault information through standard data interfaces.
The acquisition and acquisition of OBD vehicle information is the first and most critical step in implementing smart video element information scheduling. The collection of OBD vehicle information needs to support KWP2000, CANBUS, J1850PWM and ISO9141 and other electronic communication protocols. It can read and support the standard OBD. The entire code of the vehicle, in order to complete the basic data reading work, provide error code early warning and other functions; OBD vehicle information acquisition module must fully consider the vehicle's internal electromagnetic environment, including the construction of protection circuit, to ensure long-term safety and stability of the module. Normal operation.
(2) Acquisition of satellite positioning data
In addition to the above connection with the OBD system and acquisition of vehicle information, in order to grasp the dynamic geographical location of the vehicle, it is also necessary to resolve the collection of vehicle satellite positioning data. At present, there are two kinds of GPS satellites: GPS and BeiDou. From the perspective of security and security, Beidou positioning system is generally used in China, and the BeiDou positioning module is used on location information service terminals to provide more accurate location services. Its positioning effect is far superior. Use traditional GPS positioning mode. While providing location services, vehicle speed and acceleration information services can also be provided, which in combination with OBD data can more accurately describe vehicle status information.
After obtaining the OBD information and satellite positioning data, it is transmitted to the background through the relevant wireless network.
2. Reverse analysis of location and navigation information
In contrast to knowing a geographic location and retrieving latitude and longitude coordinate information in general, what is needed in this section is the inverse analysis of geographical location. Reverse geo-positional analysis, also known as reverse geocoding service, is a conversion service from known geographical coordinates to corresponding address descriptions (eg, provinces, cities, streets, roads, house numbers, etc.). Through this function, you can quickly obtain the name, specific address, type, and nearby roads, provinces, and cities of a geographical location.
As shown in FIG. 4 , the inverse geo-position analysis includes three steps: acquisition of satellite positioning coordinates, conversion of dedicated map coordinates, and matching of dedicated map coordinates with geographic locations. The satellite positioning coordinates are obtained by the positioning chip, and the special map coordinate transformation and geographical location information matching are implemented by the position information reverse parsing server and the special network map engine. Inverse geo-position parsing mainly relies on calling the getAddress interface of the Geocoder class in the AMap library.
3. Mileage verification algorithm
Mileage statistics are calculated based on the latitude and longitude coordinates in the RMC data package output by the satellite positioning module. In general, the satellite positioning module outputs latitude and longitude information once per second, calculates the mileage in the last second time based on the point between the two latitude and longitude points, and finally adds up the mileage number in each second, which is the total mileage. It is a theoretical algorithm. In order to improve the accuracy of mileage calculation, the algorithm needs to increase the latitude and longitude filtering drift algorithm, and increase the correlation coefficient (for example, synchronously verify the mileage by calculation of the speed and interval time) so as to make every second time The mileage is closer to the actual mileage value.
4. Data push dynamic projection in reverse
As shown in FIG. 5 , after the corresponding information obtained by the front-end device is combined with the inverse geo-position parsing data and the mileage check algorithm, the character superposition service receives all the information pushed by the parsing server and includes all the data including the terminal ID. , street name, speed and other information, after parsing the data information, according to the terminal ID, query the corresponding data list, and then obtain some auxiliary information, such as the task number, license plate information. After synthesizing the above various information, the information is dynamically superimposed and displayed on the video screen using an on-screen display (OSD) overlay technology.
(III) Status Quo of Technology Development
At present, the application of mobile video element information intelligent dispatching display technology is still in its infancy in China, and the combination of mobile video and element information is rarely used, but a single application is widely used. For example, in the collection and application of OBD information, the vehicle system monitoring application is mainly carried out around OBD, such as vehicle safety real-time monitoring, remote debugging and diagnosis, and failure inspection. Many domestic and foreign manufacturers have developed a variety of diagnostic software around OBD. Data transmission through the Internet, such as the Internet cart box of China Mobile, Baidu, Tencent, etc., is mainly used for vehicle remote diagnosis and fault alarm applications, but only for OBD information acquisition. The application does not incorporate video. In the application of mobile video, there is a vehicle-mounted video terminal of a security company, but it is mainly used for video acquisition and transmission, and does not support the comprehensive collection and transmission of data such as OBD information.
IV. Recommendations for policing applications
With the rapid development of technologies such as Big Data, Internet of Things, cloud computing, and Internet+, traditional mobile video applications are facing new challenges. The timely addition of smart application capabilities is also an irresistible trend, and it is an urgent need for current police command and dispatch work. In terms of further enriching the information content in mobile video screens, it is an important intelligent real-world task. In the process, we recommend focusing on the following issues.
(I) Choose the right wireless transmission network
Choosing a suitable wireless transmission network is the basic premise of this research application. At present, the mobile video applications in various localities are based on the operators' public networks (3G, 4G), *340MHz, and satellites, and use local self-built networks, such as the 4G wireless government special network in Nanjing. The advantages and disadvantages of the above networks vary. For example, the security of the public network is not strong, the bandwidth is easy to be blocked, and the video delay is large. The *340MHZ needs to invest in establishing a station and the frequency resources are limited. The satellite equipment is large in investment, bulky, inconvenient to carry, weather, The environmental impact is large, and the government special network needs system planning and huge construction investment in the early stage, but it has strong security and confidentiality, guaranteed bandwidth transmission, and small video delay.
(two) effective acquisition of front-end data
After choosing the appropriate wireless transmission network, the next step is to consider how to achieve the collection and acquisition of front-end data. It mainly collects three kinds of information: First, the collection of vehicle affiliated information, mainly through the docking with the OBD vehicle diagnostic system, to achieve the acquisition of information on speed, mileage, etc.; second is the collection of vehicle-borne video, to support high-definition, The real-time acquisition and upload of low-delay mobile video is the basis for all element information display. The third is the acquisition of satellite positioning information. It is necessary to support GPS and BeiDou modes to achieve real-time collection and upload of geographic latitude and longitude information of vehicles. From the perspective of policing operations, equipment operation efficiency, and post-maintenance, the above information collection modules should be consolidated and integrated to form a miniaturized integrated collection and transmission terminal, so that the front-end data information can be consolidated and uploaded to the background.
(C) Iterative optimization data analysis algorithm
Before the front-end data information (vehicle affiliate information, vehicle video information, satellite positioning information) is transmitted to the center backstage through the wireless network, it needs to be analyzed and interpreted by the analysis server + dedicated map engine, and finally converted into the elemental information such as the vehicle speed and mileage. With the license plate, task name, time information and other advance preset information, work through the character overlay server, and finally displayed in the video screen. In this process, the data of the vehicle speed is simple and fixed. The key is to determine the mileage value. It is not possible to completely rely on the data collected by the on-board terminal to analyze the calculation results. A certain calibration technique must be used to perform multiple calibrations to minimize the number of miles. Error range, as far as possible to improve the accuracy of mileage.
V. Conclusion
The intelligent dispatching and display technology of mobile video elements is currently in its infancy, but its future application development cannot be underestimated. In policing work, it is possible to meet the different business needs of multiple police departments, and to solve the problems encountered in previous work, for example, the security department can implement intelligent full-schedule dispatch of the guard's target fleet through the application of the technology, and master the vehicle at all times. The various data quality states of travel further enhance the fine-grained dispatching level of security work and provide strong technical support for ensuring the absolute safety of guards. Another example is the police protection department. Through the application of technology, the police vehicles of all units can be integrated into the platform for unified management, real-time monitoring of vehicle speed, fuel consumption, and other driving information and fault alarms to further liberate the police force and improve work efficiency.
Mobile video elements intelligent scheduling display technology, visualization is called "Let the image speak." At present, it is mainly based on the consideration of motor vehicles. With the continuous development of technology development and policing demands, the technology can gradually extend to the application of police airspace in the near future, such as police helicopters, drones, etc., and the application results will be more significant. Actually, in policing work, there are many research practices that can be carried out around images, such as "Let the image recognize," "Let the image measure," "Let the image count," "Let the image acquire," and "Let Images will be tracked, "Let the image be measured," "Let the image think," and so on. We need to constantly think and practice in order to promote the development of information technology to a higher level.
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[2] Huang Haifeng. TD-LTE dedicated private network market: China's cluster technology into the 4G era of the communications world, 2013 (10)
Original title * technology | * mobile video display element information intelligent scheduling application of technology to explore: Xu Yong Xu Hailiang