Security video surveillance system ** Generation video Surveillance: Traditional Analog Closed-circuit video Surveillance system (CCTV) :
It relies on specialized equipment such as cameras, cables, video recorders and monitors. For example, a video camera outputs a video signal through a dedicated coaxial cable. The cable is connected to special analog video equipment, such as video image splitter, matrix, switcher, cassette recorder (VCR) and video monitor. There are a number of limitations in the simulation of CCTV:
The limited monitoring capability supports only local monitoring and is limited by the length of the analog video cable transmission and the cable amplifier.
Systems with limited scalability are usually limited by the input capacity of video splitter, matrix and switcher.
The VCRS must be removed from the VCRS or replaced with new VCRS that are liable to be lost, stolen, or accidentally erased.
Low video quality is the main limiting factor. Video quality decreases with the number of copies.
** Generation of Video monitoring: Current "Analog-digital" monitoring system (DVR) :
"Analog - digital monitoring system based on digital hard disk video recorder DVR core analog and digital solutions, still use a coaxial cable from the camera to the DVR output video signal, through DVR support video recording and playback at the same time, and can support IP network access limited, with multifarious DVR products, there is no standard, so this generation system is standard closed system, DVR system there are still a lot of limitations:
The analog-digital approach to complex wiring still requires separate video cables to be installed on each camera, resulting in wiring complexity.
A typical DVR with limited scalability is limited to 16 cameras at a time.
Limited manageability you need external servers and management software to control multiple DVRS or monitoring points.
Limited remote monitoring/control capabilities you cannot access any camera from any client. You can only access the camera indirectly through the DVR.
Disk failure risk Compared to RAID redundancy and tape, "analog-digital" video is unprotected and easy to lose.
Third Generation Video Surveillance: Future complete IP video Surveillance system IPVS:
The all-IP video surveillance system is significantly different from the previous two schemes. The advantage of this system is that the camera has a built-in Web server and provides the Ethernet port directly. These cameras generate JPEG or MPEG4 data files that can be accessed, monitored, recorded, and printed by any authorized client from any location in the network, rather than producing images in the form of continuous analog video signals. The great advantages of all-IP video surveillance system are as follows:
Simplicity - All cameras are simply connected to the network via a cost-effective wired or wireless Ethernet, enabling you to leverage existing LAN infrastructure. You can use 5 types of network cables or wireless networks to transmit camera output images and horizontal, vertical, and PTZ control commands (even directly over Ethernet).
Powerful central control - an industry standard server and a set of control management applications can run the entire monitoring system.
Easy to upgrade with full scalability - easily add more cameras. The central server will be able to easily upgrade to faster processors, larger disk drives, and more bandwidth.
Full remote monitoring - any authorized client has direct access to any camera. You can also access the monitoring images through the central server.
Rugged redundant storage - Uses SCSI, RAID, and tape backup storage technologies simultaneously ** to protect monitoring images from hard drive failures.