About-network-video:
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Economic development to continuously improve the people's sense of security,
when the local traditional analog control methods can not meet certain
industries gradually large-scale, long-distance monitoring of demand, such as
trans-regional bank network monitoring, through the network will transmit images
for remote The centralized monitoring methods have emerged. At present, as the
Internet large-scale popular, remote monitoring have penetrated into education,
government, entertainment, hospitals, hotels, sports venues, security, and other
urban areas.
Familiar with the remote monitoring of people are aware that
the image after the intake of long-distance transmission of the main ways in
addition to the Internet, and fiber. Some people believe that through Guangduan
Ji and optical remote monitoring, its video image quality and transmission speed
is superior to network transmission, but its expensive cost and complexity of
cabling works people off. More importantly, the capacity of its network
relatively poor and can not meet the needs of large-scale monitoring project.
And network monitoring in which demonstrated its unique advantage: the places
where there are networks will be able to build network monitoring system. As
omit the traditional cabling and wiring maintenance costs, makes network
monitoring system installation costs greatly reduced. For users, network
monitoring is also not the time, place restrictions on the authorization of the
on-demand at any time under control, and that is plug-and-play, use very
convenient. Thus, IP network monitoring by the industry agreed that the next
video networking monitoring of the main trends.
Network Monitoring the
advantages and broad prospects have prompted domestic and foreign security firms
for research and development of network monitoring products, such as the
previous DVR, then the network cameras and video servers. These network products
due to the advanced digital compression technology will enable the transmission
bandwidth and storage requirements to smaller, to make up for lack of network
bandwidth caused by defects. In recent years, digital video surveillance system
the core equipment - network cameras and video servers because of a more
intelligent and powerful networking capabilities, network monitoring and become
the new darling of the market. According to Gartner Group predicted that in 2005
global sales of video servers will reach 42 billion U.S. dollars, an average
annual growth rate will reach 64 percent, while the growth rate of the Chinese
market is expected to more than the international standard. At the same time,
the rapid development of broadband technology driven, network monitoring camera
market will also be an annual growth rate of 57.5%.
"With the
improvement of network, IP network monitoring will be considerable development"
With people's living standards improve and enhance the security
requirements, the traditional sense of the simulation has been monitoring the
localization far from meeting market demand. And the rapid development of
network systems, making rely on the network for remote video monitoring
possible.
For large-scale monitoring system, the local monitoring
network monitoring relative has unparalleled advantages, concrete manifestation
of a more flexible approach in monitoring, system construction and maintenance
of relatively low cost, retain a greater volume of data, data retention means
more, Broader forms of data applications, system integration, higher. On the
other hand, web-based video surveillance breakthrough in time, geographical
restrictions, as long as the existing local network can create a network
monitoring system, eliminating the traditional cabling and wiring maintenance
costs and reduce the cost of monitoring; Authorized users in the circumstances,
we can at any time without geographical restrictions on-demand monitoring, and
Plug, that is used, that is to see.
It can be said that at this stage
through the network and network products have been truly realized scattered
cloth, centralized monitoring of remote transmission. In a number of specific
occasions, the network was effectively monitor the application by the vast
number of security firms and industry user's attention.
But worthy of
our attention is that the network video transmission network is the first
agreement proposed by the materials and did not. We know that image is a
constant flow of information and in-house Internet, information is not a
constant flow. In the course of image transmission, TCP (transmission control
protocol) first sent the information broken down into several packets, each
packet with a serial number and address to receive calibration, and insert some
correction information, and to ensure that portfolio Anxu Reliability of
transmission. And IP (Internet Protocol) packets through the network will be
transmitted to the remote host and is responsible for addressing the data
packets. At the other end, TCP packet to receive and verify the error, if error
occurred, TCP request a reissue of this particular data packets, only all the
data packets have been correctly received, TCP only with the serial number to
remodeling the original information. Based on these principles of the
transmission network, network video monitoring of the network have great
dependence. The huge flow of data and signals with the current relatively small
bandwidth available have led to the contradiction between people's IP network
video surveillance applications and is not very optimistic about the prospects,
and the image quality, network speed, transmission latency, network security
issues, Into sharp focus.
Although the network monitoring temporary
deficiencies exist, but we should also see that the network space for the
development of very great. The State Council promulgated the policy is to
encourage the building of the network, as the carrier IP network monitoring, IP
broadband development and improve the user will greatly enhance the monitoring
of the IP network's confidence. The number of domestic network operators have
each Moquancazhang, most security industry also believes that long-distance
transmission network should be monitoring the industry an important direction of
development. At the same time, its market prospects at home and abroad prompted
the Security makers will be developed to monitor the network monitoring products
as the company's research focus. According to foreign parties predicted that
network cameras in 2007 will account for half of the global market demand.
At present, domestic and international stakeholders in efforts to
improve and perfect the IP network video surveillance inherent defect, although
the short term it is very difficult to meet the needs of users, IP network video
surveillance technology can only be described as increasingly perfect, but it
can be predicted that the IP network will be charged with the network and
further improve the development has been made.
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