In recent years, with the rapid development of monitoring technologies such as audio and video coding and decoding algorithm technology, integrated circuit application technology, network control and transmission technology, software technology, and information storage and calling technology, high-definition network video surveillance has gradually become the mainstream trend; on the other hand, , Domestic video surveillance manufacturers and users' pursuit of high-definition network surveillance has also greatly stimulated the development of the high-definition surveillance industry.
　　HD surveillance applications
　　With the rapid development of high-definition network video surveillance, the integration of the high-definition industry with other industries has been enhanced. The HD industry has gradually penetrated into transportation, finance, campus, medical, airport/station and many other industries, and has been practically applied in some key places.

High-definition applications in urban traffic. With the rapid increase in the number of vehicles in the city, the emergence of traffic jams, the high frequency of traffic accidents, the pollution of the traffic environment, and the chaos of traffic security have seriously affected the current development of the city and the lives of the people. For this reason, high-definition monitoring systems such as road monitoring, red light capture, smart bayonet, and mobile speed measurement have been widely popularized.

　　 High-definition applications in special industries such as finance and cultural blogs. These places are widely open to the public, and the security prevention system implements the principle of focusing on prevention and combining prevention and fighting, creating conditions for combating criminal crimes, providing early warning and quick response to police; delaying illegal activities and reducing the scope of damage; And the role of retrospective and verification afterwards. Its security monitoring is based on the intrusion alarm system as the core, combined with image and sound review system. Among them, the definition of video monitoring is very high. Therefore, it is necessary to configure high-definition and high-performance cameras suitable for various lighting conditions. High-definition surveillance of places.

　　 High-definition application in the safe campus. It is an important way for campuses to use technology to improve campus safety and defense capabilities and realize the transition from "human defense" to "security" at this stage to create a safe and harmonious campus environment. At present, the campus covers a large area, with large teaching buildings and population. Therefore, the safety of students, teachers, and schools is very insufficient, especially in places where there are more emergencies such as activity venues, staircase aisles, student cafeterias, etc. High-definition video is required for 24-hour monitoring, so as to achieve the effects of early warning, retrospective and verification afterwards.

　　 High-definition application in urban medical care. After using the high-definition video telemedicine system, patients can get high-quality medical services in community hospitals without going far away, which solves the problem of difficult and expensive medical treatment. In addition, high-definition monitoring systems are gradually being used in hospital emergency command, remote visits, hospital equipment resource security management and other fields.

　　 HD applications in key places. The government's procurement bidding has always been a key area of ​​government monitoring. The bid evaluation process is the most critical link in various procurements. The process involves purchasers, experts, suppliers, centralized procurement agencies, and regulatory authorities. The bid evaluation process is the one that really participates in the bid evaluation process and has a say in it. Standard expert. Therefore, in order to ensure the openness, fairness and impartiality of bidding and bidding, bidding centers in various regions have established bid evaluation room monitoring systems, installed high-definition cameras and pickups in each bid evaluation room, and performed video and audio real-time monitoring and video storage in the bid evaluation room. , The bidders, supervisory departments and bidders can supervise the activities of the judges through the monitoring screen, put the working status of the bid evaluation experts under the supervision of the high-definition lens, provide clearer and more key details of the image, so as to achieve openness and transparency Evaluation of bids. At the same time, after each bid evaluation, the staff will back up and archive the data of the day for later verification.

　　High-definition monitoring overall solution

　　1. Solutions for the upgrading and transformation of the simulation system in the bid evaluation room

At present, part of the bid evaluation room monitoring system adopts analog cameras and embedded hard disk video recorders, and the monitoring system has been in operation for 1-3 years, and it has not yet reached the scrapped replacement time. If you want to upgrade to a high-definition monitoring system immediately, the bidding center will have the problem of reinvesting funds. The analog system upgrade solution is to use a video encoder to convert front-end analog signals and audio signals into digital signals, install high-definition network cameras in important bid evaluation rooms, and use network hard disk video recorders NVR to replace the original DVR at the back end. A solution for upgrading analog systems to digital systems under low-cost conditions. As shown below:

　　Scheme design description

The overall structure is converted from analog to network. The monitoring front-end adds an encoder to reduce the attenuation and interference of audio signals and analog video signals during long-distance transmission. The important monitoring front-end adds high-definition network cameras to achieve the purpose of high-definition monitoring. Solution steps:

①In the original bid evaluation room, an encoder was added to the monitoring front end. In order to reduce the interference of audio signals and video signals, the encoder needs to be placed close to the analog gun and pickup; add high-definition network cameras at important monitoring points, Xuntong’s 1.3 million high-definition network The camera supports the H.264 video compression protocol and dual stream function. At a resolution of 1280*720 (progressive scan), the 25-frame real-time monitoring image has a minimum of 2M stream, which can effectively solve the problem of high-definition video storage space.

　　②Using NVR to replace the original DVR, Xuntong’s embedded NVR can support 16, 32 and 64 network cameras, support HDMI high-definition interface, support high-definition video storage and streaming media forwarding functions.

③Using a network encoder and a high-definition network camera that support dual stream functions, it can produce two different encoding formats at the same time, the main stream image format includes 1080P, 720P, D1, CIF, QCIF, and the sub stream image format There are CIF and QCIF. The dual stream technology effectively balances image quality and transmission quality.

　　④The embedded NVR that supports the streaming media forwarding function is adopted. When many clients need to access the same remote screen at the same time, the streaming media forwarding function can be used to reduce the pressure on the front-end equipment.

　　⑤The video file supports the mainstream media players on the market, and provides the video data required by the superior.

　　2. Full digital high-definition solution in the bid evaluation room

Refers to the surveillance front end using network cameras and the network as the transmission carrier. The data transmission has strong anti-interference ability and is not easily affected by the signal attenuation of the transmission line. It is suitable for long-distance data transmission and can perfectly solve the monitoring needs of cross-regions. It is the video surveillance industry. Technology development trends.

　　The all-digital high-definition solution is suitable for the bidding center of the newly-built monitoring system. The proposal suggests that all front-end monitoring points in the bid evaluation room use high-definition network cameras, and other waiting areas and peripherals use standard-definition network cameras. Using a hybrid networking method of high-definition and standard-definition can save equipment costs, and the practicality and economy of the system can be perfectly combined. , Which fully meets the user's cost-effective needs; the back-end management and storage adopts embedded NVR, and the recording file can be selected as a video backup host; according to the number of project monitoring points, the embedded NVR local high-definition display or decoder high-definition display can be selected. As shown below:

　　Scheme design description

Implementation steps of the full digital high-definition solution:

　　① All front-end monitoring points in the standard room use high-definition network cameras, and other waiting areas and peripherals use standard-definition network cameras.

②Using an embedded NVR, which can manage and store up to 64 network cameras, and support the management of multiple decoders. According to the number of monitoring points of the project, the embedded NVR local high-definition display is optional, and the multi-channel decoding is optional when there are many monitoring points. The device (HD interface) high-definition display.

　　③The bidding centers in all regions need to store the video data during bid evaluation for a long time. Generally, they will record the video data on a CD-ROM. In response to the characteristics of the bidding industry, Xuntong launched a video backup host system, which automatically extracts the required video data from the NVR according to the bid evaluation date plan, which can be used as a redundant system for video data backup.

　　④Using Xuntong multi-channel decoder with HDMI HD interface, supporting HD and 1/4/8/9/16 screen split display, through network monitoring management service and embedded NVR control.

　　High-definition surveillance system features

　　 1. The image is clearer and provides more key details

　　 High-definition cameras provide resolutions above 720P, output high-resolution and clear video images, can clearly identify the details of the monitoring area, and provide reliable guarantees for real-time monitoring and subsequent inquiries.

　　 2. The monitoring area is larger

　　 Compared with analog cameras, high-definition cameras have higher pixels and can support monitoring larger scenes, so the monitoring area is larger.

　　3. Suitable for long-distance transmission, strong anti-interference ability of digital information

　　 High-definition network cameras transmit digital compressed signals through the network and are not easily affected by the signal attenuation of the transmission line. Especially in the case of harsh on-site environment or inconvenience to go directly to the site, it can perfectly solve the monitoring needs of cross-regions.

　　 4. Easy to install and maintain

　　 High-definition network cameras are highly integrated. Video, audio and alarm signals are digitally compressed and transmitted through the network, simplifying system installation and construction wiring. The HD network camera supports POE power supply, and only one network can solve the power supply and data transmission.

　　 Conclusion

Since the security industry entered the era of high-definition surveillance, system high-definition has gradually been recognized by people. A comprehensive high-definition surveillance system must be a set of overall solutions, which will include high-definition cameras, high-definition dome cameras, high-definition video encoder equipment, management Platform (NVR), high-definition display, storage system, transmission system and other products in each link, the development of high-definition technology in each link will profoundly affect the development pattern of the security industry. With the continuous evolution of high-definition display technology, the continuous advancement of the national three-network joint work, and the introduction of more and more detailed high-definition solutions, we have reason to believe that the comprehensive high-definition of the surveillance system is just around the corner.