The digital video security monitoring system is mainly for all-round 24-hour uninterrupted video monitoring of the public areas in the project; in the monitoring center, the real-time situation of each monitoring area inside and outside the whole building is displayed through the TV wall. Based on the transmission mode of Internet of things, the video security monitoring system of this project can realize the interconnection, intercommunication and mutual control of different equipment and systems, and realize the video monitoring Audio and alarm information collection, transmission / conversion, display / storage and control; identity authentication and authority management to ensure the safety of information; linkage with the alarm system, data interface with other business systems, convenient for later expansion, and connection with video signals of sports venues and sub control centers.

Specific design

1. System overview

The project is an integrated office building, video security monitoring system is mainly in the elevator car, entrance hall, entrance of each floor, underground parking lot and other places to set up cameras, not only considering the safety of public places, but also taking into account the privacy of important positions, camera layout should be strict and reasonable. 555 cameras suitable for the environment are set in the public area for comprehensive real-time monitoring; the transmission part of the whole digital video security monitoring system adopts six types of wiring.

2. Point distribution

According to the characteristics and positioning of the project, infrared cameras are required to ensure the monitoring effect. Such as entrance and exit, underground corridor, etc; Infrared hemispherical camera is selected for elevator car, elevator front room and corridor. Infrared high-speed ball cameras are used in large space areas such as the area outside the building, the entrance hall on the first floor and the roof platform.

There are 555 cameras in the system.

Design principles: infrared hemisphere installation area: staircase anteroom, elevator anteroom, both sides of corridor, corridor, main entrance and exit hall, main building and annex building entrance and exit; indoor fastball installation area: first floor, roof platform and other large areas; outdoor fastball installation area: middle school square and surrounding areas; infrared gun machine: underground garage lane, vehicle entrance and so on; elevator hemisphere: all electric power Inside the ladder.

System composition and structure: the system adopts network architecture, which can be expanded by workstation, workstation client and other ways to ensure that the key video images can be connected to the 110 monitoring system in the later stage.

The digital video security monitoring system of the project is basically consistent with the conventional analog monitoring system, which is composed of four parts: front-end equipment, transmission equipment, control equipment and display equipment.

3.1 system structure diagram

Design and application of video security monitoring system based on Internet of things technology

3.2 front end equipment

The camera part is installed on the monitoring site, including camera, lens, protective cover, bracket, pan tilt, etc. Its function is to take pictures of the monitoring area and convert it into electrical signals.

The camera part is the leading edge of the monitoring system and the “eye” of the whole system. It turns the monitored content into image signal and transmits it to the monitor of the control center. The quality of the camera part and the image signal it produces will affect the quality of the whole system.

Because the video security monitoring system is based on IP network transmission, except for IP cameras directly connected to the network, all other front-end elevator cameras are connected to the video encoder to complete the input of monitoring signal, digitize and compress the analog video signal to form IP data packet, which is transmitted to the designated destination address through the network. Each video encoder occupies one IP address on the network and encodes the front-end camera according to the principle of proximity.

The video codec supports at least two kinds of bitstreams, and the video stream control technology adopted by the system is variable bitstream management technology, that is, the bandwidth of any channel of video can be dynamically adjusted when the upper bandwidth is set.

3.3 transmission part

Transmission part from front-end equipment to video encoder: Shielded Video cable is used for video signal of front-end elevator camera, syv75-5 coaxial cable is used according to installation position of camera to ensure accurate transmission of monitoring information. Rvvp2 * 1.0 shielded twisted pair cable is used as control line. The power line is rvv2 * 1.0 cable. Six types of unshielded twisted pair are used from IP camera, video encoder to access switch; optical cable is used from access switch to core switch of monitoring center to ensure data bandwidth of backbone.

3.4 control center

The control center is the “heart” and “brain” of the whole system, and it is a project to realize the function of the whole system. Due to the large area of the whole project and the expansion space for phase II and subsequent buildings, it is required to adopt the current mainstream digital transmission solution, which is convenient for storage and control, and can also support network remote viewing.

The monitoring center uses the intelligent security monitoring box as the front-end camera access to provide video recording, retrieval, system management, video data storage and other services. The monitoring video is monitored on the wall, and the management and real-time monitoring operation of the system are realized through the monitoring client workstation. You can browse all the front-end videos and operate all the devices.

System configuration: display part: 46 “ultra narrow edge LCD splicing unit, 3 rows * 5 columns, brightness 450cd / m2, contrast 3000:1, splicing seam less than 7.3mm, viewing angle 178, response time 8ms, VGA / RGB / AV interface, including splicing screen supporting equipment.

Alarm plane control schematic electronic board, including camera control point (number), perimeter display; Key area alarm display.

3.5 network architecture design

Due to the use of digital monitoring, this scheme designs a monitoring network, which is separated from the working network, so as to ensure the safety and reliability of the system. According to the situation of camera access, the access switch of the monitoring system adopts 100m local Ethernet architecture, which can meet the demand of video monitoring data transmission. As all data must be transmitted through the central switch, the monitoring, storage data and video playback data of all cameras are transferred, so it is recommended to adopt 1000m Ethernet architecture, which can meet the demand of monitoring data transmission .

3.6 storage system design

Total storage capacity of each front end (GB) = / 1024

3、 System function

This scheme adopts a digital video monitoring system based on IP network, and its main functions include:

L system open and compatible

Open and compatible access: the system supports domestic mainstream manufacturers’ IPC access through onvif and psia protocols, with high openness and strong compatibility.

Open system: system development interface, supporting compatible access to other standard video monitoring platform.

Full Channel HD access: up to 500W pixel HD network video preview, storage and playback.

HD dual output / dual operation: the system supports HDMI, VGA dual HD (1080p) dual output and dual operation, greatly improving the preview definition and operation convenience.

The quality of the system is reliable

Patent Exir Technology: dot matrix infrared IPC products use Haikang independent patent, the world’s first rectangular spot lens, with four core technologies, namely surface emitting technology, black crystal packaging technology, double-sided composite lens technology, intelligent smartir technology, making the infrared monitoring picture center unexposed, uniform without dark angle, infrared distance up to 50-80 meters.

Delicate structure: precise heat dissipation design and efficient heat dissipation materials can control the temperature rise of the camera at a low level, and prolong the service life of IPC for one year. Patented black anti reflective sunshade can effectively prevent image blur caused by infrared interference and sunlight interference.

Intelligent hard disk management: the system supports disk pre allocation, pre allocation of indexes and video files under hard disk initialization, so as to eliminate the generation of disk fragments and prolong the life of hard disk; Support smart function, timely access to smart detection information of hard disk, accurate feedback of working state of hard disk, early warning, ensure safe and reliable data storage; support hard disk sleep, non working hard disk can enter sleep state in time, reduce power consumption, extend the service life of hard disk.

L convenient operation for users

One click Add: the system supports the automatic addition of IPC function. During operation, the IPC and NVR are connected to the network first, and then one click is added automatically on the system operation interface. The addition can be completed in one step, which greatly reduces the workload of construction and maintenance.

One click video recording: the system supports one click video recording plan, and can configure all channel motion detection functions with one click. It is a simple and convenient application for construction operation and later maintenance management.

One key positioning: the system supports 3D positioning operation function. As long as the position to be enlarged is selected, the ball machine can automatically display the image centered on the area on the screen. It can lock the target with one key, avoid complex operation, and greatly improve the operation efficiency.

One click Internet access: the system supports hiddns, a dynamic domain name resolution service system built by Hikvision, and UPnP (universal plug and play) functions. It doesn’t need to register and use a third-party domain name, and external network access is in place in one step.

One key call: the system can quickly call out the menu of the ball machine with one key under the PTZ control interface, which makes it more convenient to adjust the parameters of the ball machine. Saving investment cost

After the upgrade of the new encoding engine, the front-end high-definition IPC only needs 1 ~ 2M bit rate for 720p (130W pixels) and 3 ~ 4m bit rate for 1080p (200W pixels), which effectively reduces the network bandwidth and storage cost.

The system supports Poe switch and connects directly to high-definition IPC with POE function through network cable, which can not only transmit video signal but also supply power for it, effectively saving the cost of power wiring.

L real time image viewing

It shall be able to watch the image in real time according to the specified equipment and channel, and support the display, zoom, capture and video recording of the monitoring image. The quality of real-time monitoring image should be clear and fluent.

L remote control

It shall be able to remotely control various actions of front-end equipment through manual or automatic operation; it shall be able to set control priority, and corresponding measures shall be taken to ensure priority response to high-level user requests.

Retrieval and playback of historical images

It shall be able to retrieve, playback and download historical image data according to specified equipment, channel, time, alarm information and other elements; playback shall support normal playback, fast playback, slow playback, frame by frame advance and retreat, picture pause, image capture, etc.; it shall support zoom display of playback image.

The front-end encoder supports dual code streams to meet the requirements of real-time monitoring stream and storage stream. Different coding methods, definition and bandwidth can be adopted to meet the necessary real-time monitoring and storage strategies.

Human computer interaction of L system

Support web management; It should have intuitive, friendly and concise human-computer interaction interface; It should have the processing functions of video image segmentation display and information prompt; It should be able to reflect its own operation, and give instructions for normal, alarm, fault and other states.

L monitoring center protection

The monitoring host integrates the self-protection function of the general control center, integrates the maximum 4-way video coding channels for the video monitoring and remote self-test of the center, and has built-in 8-way alarm input and 4-way alarm output alarm control module, which can realize the central anti intrusion detection and central linkage alarm output through the linkage with the access control audible and visual alarm.

L user and authority management

The monitoring center shall have the function of authorizing and authenticating the access users. User and authority management can be performed independently or centrally by monitoring centers at all levels. The user and authority management module should define the user’s operation authority to the device, the authority to access the data and the authority to use the program. The users of the monitoring center shall have the right to obtain the historical images and real-time monitoring images within their jurisdiction. When they need to obtain the historical images and real-time images within their non jurisdiction, they shall obtain effective authorization. The system can provide locking and unlocking functions for exclusive control of front-end devices, and the locking and unlocking modes can be set.

Editor in charge: GT

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