Technology development trend
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While the market demand is constantly improving, it also promotes the development and maturity of related technologies. The vehicle mobile monitoring system involves related technologies in many fields such as electronics, communication, computer, control, image analysis and processing, and multi-industry. As the technology continues to develop and mature, the specifications of the vehicle mobile monitoring system will inevitably increase. This is an overall coordinated development process, that is, every link in the system needs to be developed simultaneously, and the lack of technological development in a certain link will cause the bottleneck of system improvement. The technical development trend is mainly due to the following points.
Network, HD trend
Traditional analog video access determines the resolution of the system video to D1 or CIF, while limiting the application of the entire system is based on D1 or CIF. In 2011, the first year of video surveillance HD application was launched. The high-definition surveillance solution finally broke out after years of brewing, eroding the market of analog video surveillance. The on-board monitoring system has higher and higher requirements for high-definition picture quality.
The video recorded by the HD camera is a high-definition video, which is calculated at 1080P (1920×1080) resolution. In the same monitoring range, the image density is 4 times higher than D1, that is, the video image is 4 times clearer than before. This point is very conducive to the public security department's on-site case solving and evidence collection. If it is controlled by the same image density, the scope of the monitored field of view is four times larger than the previous one. That is, the monitoring scene of four cameras is installed in the past, but now only one or two are installed, which greatly saves manpower and material resources. Resources.
The current mainstream HD surveillance solutions are based on IP and HD-SDI. The mobility of the vehicle monitoring application environment determines that the vehicle HD monitoring system must be network monitoring. The networked high-definition vehicle monitoring solution has a simpler implementation scheme than the previous analog solution. With the POE power supply technology, the wiring of the whole vehicle only needs the network cable, and the video and audio data, control signals, and alarm signals are transmitted through the network cable. . The interface of the analog system is reduced by half, the corresponding fault point is also reduced by half, and the overhead of auxiliary materials and wires is also reduced by half, which saves the cost of construction and maintenance. At the same time, the network port identification technology built in the network video recorder can automatically identify and address the front-end HD network camera, and realize zero-configuration plug-and-play.
Diversification of collected content
The Internet of Things is an extension of the Internet. The concept of the Internet of Things has been gradually promoted, and it has been strongly supported by several technical alliances and governments, all of which aim to build a "smart planet." In the Internet of Things era, any object can be perceived and connected to the network.
Today, when the Internet of Things is prevalent, the in-vehicle mobile monitoring system needs to expand the data collection content, because the diversification of collection provides the necessary basis for the back-end monitoring platform and the transportation service information platform, and is a prerequisite for the application of the back-end platform.
The data collected by the current vehicle monitoring system generally includes audio and video information, GPS information, driving information and alarm information. However, under the framework of intelligent transportation planning, this information is not enough to fully present the status of the vehicle monitoring system. In the future, more in-vehicle information will be added, such as: tire pressure information, in-vehicle dangerous goods detection information, in-car ticket information, drivers. Status information, passenger traffic information on the car, and congestion information on the car.
Intelligent development
As the acquisition system continues to expand and expand, it will inevitably lead to an increase in the amount of information. How to optimize the information system requires the system to enhance intelligent processing.
First, an intelligent analysis algorithm can be integrated in the information collection. For example, the information collected by the video can filter out redundant environmental information in the monitoring scenario, thereby increasing the efficiency of the information, thereby saving storage space and saving network bandwidth. Or directly analyze key data points from the video information, such as the state of the guest, the state of the driver, and even identify the identity of the person and the guest, forming secondary data for storage and transmission.
Secondly, how to quickly find effective information in massive data information needs to optimize data search technology. In the era of synchronous development of cloud computing technology, data search function will become easy and convenient, and intelligent search algorithm To ensure the real-time nature of system applications.
Multi-stream application
Wireless network transmission has always been a bottleneck in the development of front-end applications of vehicle monitoring systems. The bandwidth of 3G is limited for the ever-expanding system application. With the development of technologies such as OFDM (Orthogonal Frequency Division Multiplexing) technology, MIMO (Multiple Input Multiple Output), and smart antenna, the 4G era can be expected, but The administrative monopoly of the wireless communication industry, I am afraid that there will be a period of 5 to 10 years in the 3G era.
Compared with current in-vehicle monitoring applications, the monitoring platform has both real-time monitoring requirements and high image quality requirements, but the transmission bandwidth is limited. Front-end systems can use multi-stream technology to adapt to network bandwidth to meet monitoring needs. Multi-streaming technology generates different code streams simultaneously during video capture. For example, a high-definition full-frame rate code stream is used for local storage, and a low-frame rate code stream is used to realize remote real-time monitoring of the network. Rate streams are used for remote data forensics at alarm or other critical moments.
Platform data fusion
At present, most domestic on-board monitoring systems are led by different organizations and organizations. The systems are in a state of division. Many data information systems are not linked, and resources cannot be shared. This hinders the development of system applications. Under the policy plan of “smart city†and “intelligent transportationâ€, it is necessary to integrate all relevant monitoring systems to maximize the utilization of resources in order to truly carry out intelligent traffic information services. This requires the integration of data from various in-vehicle monitoring platforms to provide services in a unified standard and unified format, and requires an effective data management mechanism to combine these data in an orderly manner, using cloud computing technology for users and The agency provides on-demand services.
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