Five major points analysis visual video surveillance system
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Video visual control comes from the development of industrial automation control. Take the power industry as an example. It develops traditional manual on-site meter reading and duty, and develops into remote meter reading, unattended, and remote control. In addition to general security monitoring, the application of video surveillance system in the power industry also plays a role in business assistance. For example, remote visual equipment inspection, remote use of track mobile intelligent high-speed ball to achieve remote reading of various power meter values, utilization Intelligent video analysis technology to ensure the supervision of dangerous operations. Even in complex and harsh environments, video surveillance can replace manual observation. The typical applications of video visualization include medical, coal mine safety supervision, power unattended power station, customs inspection and quarantine, and civil air defense.
Video visual control breaks through the bottleneck of traditional video surveillance information one-way transmission, can provide information feedback to the scene, and can realize integration and control of other devices. Taking the smart home control system as an example, on a remote control interface, not only can the real-time video stream be browsed, but also the front-end home appliances can be adjusted and controlled, which embodies the two-way feedback and integrated control of information, but this The implementation of the device is basically realized by the home host and the switching gateway, and the conventional video monitoring device has not been able to integrate this function.
Second, the advantages and key points of video visualization control development
1. Better integration into industry segments. Industrialization is the development trend of security performance in recent years. The sales share brought by leading an industry market is far greater than the marketing of a single product. Video Visualization Control The two-way information transmission and feedback mechanism enables the uploading of other device information on the site to facilitate business analysis. At the same time, it can issue control commands and verify the execution of the executed commands in real time to avoid no action. The phenomenon of malfunction. For example, if a row of lights is turned off remotely, although the command to turn off the lights is issued, whether the lights are all turned off can be checked by video surveillance.
2. Improve the efficiency of video surveillance. Traditional video surveillance has always been in a situation of “supervising†and “controllingâ€. Although traditional pan/tilt control, voice call, and remote alarm trigger can control the front-end equipment, its intelligence and automation are not high. The incident cannot be effectively stopped. Taking the public security case as an example, the video surveillance system performs the functions of deterrence and forensics, but when an emergency occurs, it is still unable to effectively control the situation in a short period of time. After the combination of visual control and video intelligence analysis, there will be a situation of intelligent linkage. Through the intelligent analysis of video, the linkage control module is triggered, and the corresponding protection plan is opened to ensure the security of property and life in time. For example, the combination of video pyrotechnic identification technology applied to fire protection and fire protection system; face recognition access control; license plate recognition parking system.
3. Visual control is an inevitable stage of the industry's development trend. The industry has summarized the following developments in the security field: "Security originated from intrusion alarms, developed in video surveillance, and matured in control systems with video analysis." With the development trend of high definition, video surveillance distinguishes details The demand has been solved very well, and the maturity of intelligent video analysis technology represents the best implementation of intelligent front-end. The external linkage of intelligent front-end must be visual control technology.
4. The key to the development of video visual control lies in the data exchange and collaborative work between the control device and the controlled device. The control device shall be able to actively generate the linkage command through the intelligent video analysis or transmit the manual trigger command issued by the control center. After the controlled device receives the control command, it can perform related actions, and some parameter values ​​of the controlled device can be uploaded by the control device. Go to the main control center. Taking the current mature technology as an example, a shifting ball with azimuth indication can perform a control action, can realize automatic scanning of idle time, and can actively upload rotational azimuth and rotational speed information to the terminal, and this application targets the shipboard monitoring. The confirmation of the position is more reasonable.
Third, video visualization control several implementation cases
1. Remote alarm switch trigger. Through the network alarm function of DVR, DVS or IPC, it can realize the remote triggering of the front-end device to open the emergency alarm from the back-end network monitoring platform. This function is more obvious in the home appliance power control in the smart home, and can also be carried out at the same time. Emergency start of tweeters, warning lights, etc., to achieve emergency evacuation, drinking resistance. It can also be used for linkage input signals of other devices.
2. One-way data flow is sent. Through RS485 communication interface, the data flow of the network monitoring platform is delivered. Because RS485 has a half-duplex working mode and has a serial bus standard, it can realize the control of multi-point devices. Compared with the switching signal, it can achieve more Calls for status and specific parameter values.
3. Two-way data exchange. Through RS232/422 communication, full-duplex high-speed data transmission can be realized, which can realize real-time data collection of integrated data monitoring platform.
4. Visual control system based on software integration. At present, the industry has mature integration cases. The software integrates video surveillance, perimeter alarm, access control, fire protection, building automation and other security systems, achieving centralized management and control of multiple devices on the same platform, and has a certain linkage. Collaborative work function.
Take the parity technology product as an example, the data is transmitted to the I/O control box through the I/O port on the PC monitoring terminal, and the I/O control box is connected to the corresponding controller through RS485 to combine the visual control control on the video monitoring screen. The control operation of some devices connects the short message transmitter through the RS232 interface to realize the sending of short messages. At the same time, in the industrial automation control, Siemens' automation control system and industrial configuration provide some reference experience.
Fourth, video visualization control application points <br> Video visualization control in the practical application should pay attention to two points, one is to in-depth understanding of the actual needs of industry customers, targeted system development, to avoid linkage failure, data exchange errors, etc. Problems; especially industrial control instruments and equipment, the structure of the equipment is complex and complex, it is very difficult to achieve full integration, can be integrated from the basic functions; the second is to achieve the highest automation, try to avoid customer use Complex manual setting and debugging occur; the linkage of system equipment is reliable and stable, and the corresponding active uploading mechanism and message distribution mechanism are provided to achieve the combination of civil air defense and technical defense in event prevention.
V. The future development trend of high-definition intelligence <br> The high-definition of video surveillance is inseparable from the support of intelligent video analysis. It is commonly referred to as the linkage of intelligent front-end and other systems, including alarm, access control, RFID, video analysis and other signals. Linkage is mainly based on video analysis. The linkage of other systems has more room for development; the video surveillance system will eventually realize the intelligent management of the system itself, realize “unattended careâ€, and even realize early warning through environmental analysis. Therefore, the active defense is effectively realized, and the influence of subjective consciousness on the system is further reduced. Combined with the linkage of the automatic control system, the high-definition monitoring system can get rid of the human judgment and realize the “active defense†in the deep application process.
