August 07, 2023
Monitoring is physical basis for real-time monitoring of key departments or critical locations across industries. With it, management departments can obtain effective data, image or sound information, and track the process of sudden. Timely observation of abnormal events. Observation and memory to ensure effective and timely management and altitude, police force deployment, case management, etc. < /p>
Composition of a video surveillance system
A video surveillance system usually consists of four main parts: front-end, transmission, control, and display recording.
External interface includes one or more cameras and corresponding lens, pan/tilt, protective cover, decode driver, etc.
Transmission includes electrical and/or fiber optic cables, and possibly wired/wireless modem equipment, etc.
Control mainly includes switcher, PTZ lens controller, operation keyboard, type control communication interface, power supply and matching console, monitor cabinet, etc.
Display recording devices mainly include monitors, VCRs, multi-screen splitters, etc.
The history of video surveillance
The video surveillance system has evolved in just over 20 years, from analog surveillance in 1980s to hot digital surveillance and then to network video surveillance on rise, there has been a fundamental change. Now that IP technologies are gradually uniting world, we need to rethink history of development of video surveillance systems.
First generation video surveillance
Conventional analogue video surveillance (CCTV)
Use special equipment such as cameras, cables, VCRs and monitors. For example, a camcorder outputs a video signal through a special coaxial cable. Cables connect to specialized analog video equipment such as video splitters, routers, switchers, video recorders (VCRs), and video monitors.
Simulated video surveillance has many limitations
1. The limited monitoring capabilities only support local monitoring, which is limited by transmission length of analog video cable and cable amplifier. 2. Limited scalability Systems are typically limited by bandwidth of video splitters, matrices, and switches.
3. Big video load. The user must take out VCR or replace it with a new video tape for storage, and video cassette is easy to lose, steal or accidentally erase.
4. The main limiting factor is poor video quality. Video quality decreases as number of copies increases.
Second generation video surveillance
Analog-Digital Video Surveillance (DVR)
Anal-to-Digital Monitoring System is a semi-analogue-half-digital solution based on a DVR with hard drive DVR. From camera to DVR, a coaxial cable is still used to output video signal. The DVR supports video recording and playback, and can also support limited IP network access. Due to variety of DVR products and lack of a standard, this generation system is a non-standard closed system.
The DVR system still has many limitations
1. Complicated Wiring With an "analog to digital" solution, it is still necessary to run a separate video cable for each camera, resulting in complex wiring.
2. Limited scalability A typical DVR limitation is that it can only expand up to 16 cameras at a time.
3. Limited manageability To manage multiple DVRs or monitoring points, you need an external server and management software.
4. Limited remote monitoring/control You cannot access any camera from any client. you moYou can only access camera indirectly through DVR.
5. Risk of disk failure Compared to RAID redundancy and tape, "analog-to-digital" circuit has no protection for video recording and is easy to lose.
Third generation video surveillance
IPVS Future Integrated IP Video Surveillance System
There are significant differences between full IP video surveillance system and two previous solutions. The advantage of this system is that camera has a built-in web server and directly exposes an Ethernet port. Instead of generating images as continuous analog video signals, these cameras generate JPEG or MPEG4, H.264 data files that can be accessed, monitored, recorded and printed by any authorized client from anywhere on network.
All-IP video surveillance is a huge advantage
1. Simplicity
All cameras simply connect to network via low-cost wired or wireless Ethernet, allowing you to use your existing LAN infrastructure. You can use a Category 5 network cable or wireless network to transmit camera output images and pan/tilt/zoom (PTZ) control commands (even directly over Ethernet).
2. Powerful Centralized Management
The entire monitoring system can run on a standard industry server and a set of application management software.
3. Ease of upgrade and comprehensive scalability
Easy to add more cameras. In future, central servers can easily be upgraded with faster processors, larger disk drives, and more bandwidth.
4. Comprehensive remote monitoring
Any authorized client can directly access any camera. You can also access surveillance images through central server.
5. Reliable backup storage
Surveillance images can be permanently protected from hard drive failures using SCSI, RAID and tape backup technologies simultaneously.
Eight Principles of Video Surveillance
With increasing security awareness, CCTV has gradually entered homes of ordinary people. Surveillance solutions also appear one after another, so what are principles to follow when installing a surveillance system? To install a surveillance system, you must first take into account following 8 principles of video surveillance installation:
1. Real time monitoring system
This is especially important. It is precisely because monitoring system works in real time that monitoring system is so necessary.
2. Safety
The monitoring system has safeguards and privacy measures in place to prevent illegal entry into system and illegal operations.
3. Scalability
The monitoring system equipment has a modular structure, and system can be conveniently and flexibly expanded on hardware and software when monitoring scale, monitoring objects or monitoring requirements change, that is, there is no need to change network structure and main software and hardware equipment.
4. Openness
The monitoring system follows principle of openness. The system provides interfaces and tools in accordance with international standards of software, hardware, communication, network, operating system and database management system, so that system has good flexibility, compatibility and expandability. , and portability.The whole network is an open system, which is compatible with products of many monitoring manufacturers and can support secondary development.
5. Standard
The equipment and technologies used in monitoring system comply with general international standards. This can give you peace of mind.
6. Flexibility
The monitoring system is flexible in network configuration and system functions and can make full use of existing network resources of video surveillance subsystem. The system integrates other subsystems into it, which can meet business requirements of various monitoring departments. The software has comprehensive functions and is easy to configure.
7. Extended
The monitoring system is most advanced in terms of reliability and practicality. The entire system will remain state of art for ten years after completion, and equipment and technology used in system can be adapted to future developments and can be easily upgraded. It will be an advanced security system that adapts to future developments, features high reliability, good privacy, easy network expansion, reliable connection processing capability, and easy operation and operation of system.
8. Practicality
The video surveillance system is capable of performing functions required by project as standard. The system meets requirements of relevant domestic and foreign specifications that are actually required by project, is easy to implement and operate. From user's point of view, maximize use of existing resources, minimize system cost, and achieve a high performance-price ratio.
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