Network video monitoring system, the composition
Network video server monitoring is the use of network resources to
transmit audio and video data, with less input, using a wide range of
characteristics, it consists of sle equipment, transmission equipment, the
monitoring center, the workstations.
1, front-end equipment: mainly include audio and data acquisition and
coding part (camera, network video server).
2, transmission equipment, mainly refers to the network system, existing
network cable network (LAN including PSTN, ISDN, XDSL, etc.), WAN, wireless
network (WLAN, satellite communication, etc) and wireless networks (CDMA, GPRS,
etc.).
3 and the monitoring center, the reduction of audio and the operation of
the system and the main storage management, video decoding equipment, storage
servers, monitoring systems management software, the TV wall, disk array, etc.
4, workstations, through the client software realization video browsing
and front equipment control.
Second, the network video monitoring mode
Digital hard disk video recorder (DVR) is the second generation of video
monitoring system, it is the most widely used video monitoring system, computer
hardware and is the integration of audio and video compression card, the
combination of two and promotes the development of video monitoring system, the
second generation of mature, casting its brilliant. Digital hard disk video
recorder for security and development work promised. The third generation of
video monitoring system at all digital network video monitoring, is eagerly
anticipating monitoring technology development. According to the network monitor
implementation, network transmission, video surveillance network, we can put
into the system under modes:
(a), digital camera + + of hard disk video recorder computer network
system
It is the most widely used network video monitoring system, through
setting port and playback, control of digital hard disk video recorder as a
server in remote client computer software or plug-in installation special
monitoring via the Internet users can see thousands of miles, realize single
road, multiple video remote monitoring and video. This way because of using
simulated camera, install require lots of coaxial cable wiring, input is larger.
(2), network video camera + simulate server + computer network system
Analog camera output signal is analog signals, computer processing of
digital signals, signal transmission network is in the digital signal, the
camera can simulate the analog signals converts digital signal, then directly
through the network transmission? The answer is yes. Network video server is
such a device. The video camera simulation analog/digital signals into digital
signals, then through high compression coding, compression, chip computer
networks output can be in the digital signal transmission in computer networks,
in the form of digital signal transmission video simulation signal. When the
video servers connected to the end of analog camera output signal, another end
plug in the computer, and then the Internet in Internet RenYiTai computer set
good gateway, routing, open our familiar IE browser, enter IP address or domain,
you can see in the computer monitor screen. If the analog camera equipped with
haeundae, we still can pass on to zoom camera computer, such as, rotating
operating control. Only a piece of string, no special digital hard disk video
recorder, realized the remote monitoring on the Internet.
(3), the network computer network system camera +
Network camera is simulated web video camera + server together, in the
camera inside built-in video/conversion, according to the network protocol
server functions, network communication and data transmission, also can receive
alarm signal and sent out alarm signal. As long as the network video camera
installed on the Internet can browse.
(4) network video monitoring system, wireless CDMA
China unicom CDMA depending on the move through video monitoring system,
wireless data communication function is CDMA and digital video coding function
integration into a convenient type products. The video camera image through it,
compression module compression by intelligent wireless terminals to realize
video data CDMA network, interactive and transmit/receive, encryption, decoding,
link control maintenance function, the real-time dynamic image to users of the
recent distance communication network unicom, it can control system through the
Internet from the real-time image information obtained. The system integrates
CDMA network and Internet network advantage, no matter where you are at any
time, can quickly access system, remote monitoring of anytime.
Third, video server basic structure, principle and characteristics
1, basic structure
In front of the network video servers that are actually encoder, since it
is the encoder will necessarily correspond with decoder. Encoder is according to
certain compression standard, the analog signals encoded in a computer network
can transmit digital signal, And Video Decoder (Video Decoder - the digital
signal is reductive into analog signals, through the simulation Video output
interface (NTSC/PAL) and the TV wall in the TV, display/monitor. When we use the
TV wall show video codec require configuration.
We can take video server can be regarded as a digital video disk with
machine, consists of one or more input analog video, digital image processor,
compression and has the function of network chip Web server, RJ - 45 network
entrance.
2, the basic principle
In the Web server embedded real-time operating system, video camera
analog/digital signal after conversion, high compression by compression, through
the internal bus chip to Web server IP address, and well equipped, after routing
network gateways, the user can directly with IE browser visit video image
browsing the Web server site, can carry out the zoom lens, times, and control of
operating camera. Yuntai
3, basic function characteristics
Four, network video server trend and prospects
Any product in the market is developing, any technology is mature, in the
application of any business is developing forward continuously. Let us together
to describe the development of network video server.
(a), the product function
1, image: high-definition image, real-time transmission of real-time means
little, high-definition is required delay image clarity, rich color required no
distortion.
2 and many users access: in video on loading multicast protocols, meet
many concurrent users access network congestion, and will not cause.
Intelligent video surveillance (3) : this is IntelligentVideo video
monitoring application, the higher in the network video cameras or embedded
intelligent video server for the monitoring module, for uninterrupted picture,
filters for users provide useful information, the key information. The fastest
way to abnormal condition warnings, minimize misstatement or omission, and
greatly improve the accuracy of alarm. Change by security personnel to monitor
screen monitoring and analysis of the model.
1) safety related category: identify suspicious activity, in the security
threats, security personnel before, Senior video motion detecting (AdvancedVMD),
object tracking (MotionTracking), FacialDetection facial recognition
(characters), vehicle identification (VehicleIdentification) and illegal
detention, such as someone ObjectPersistence (in public places a suspicious
objects, or from someone in sensitive for a long time).
(2) the safety related applications, such as automatic identification of
large customer characteristics, and notify the customer service personnel
timely. Find the crowd someone fall, promptly notify the store near the staff to
help. In addition, intelligent video system can help the patronage of retail
boss statistical number of customer, Transportation departments of traffic flow
control, etc.
Swedish Axis network communication Co., LTD. Has released its intelligent
video products, including AXIS242SIV video server and intelligent video
applications AXISIVM120 toll module, plan in the near future, illegal detention
launch plates recognition recognition system, etc. Compared with the foreign and
domestic intelligent video market now basically still blank. Generally in
monitoring system of "mentioned in the video intelligent surveillance" actually
still stays in the network video monitoring (ordinary digital control), IP
monitoring the concept, domestic manufacturers began to introduce foreign
well-known manufacturers of intelligent video software and hardware products and
technology, planning to use in the form of domestic OEM.
4 and support IPv6 network protocol
Computer network using Ipv4 agreement, IP address has been completed, the
allocation of resources will rapidly deplete, the development of the Internet by
severe restrictions, Relatively narrow network bandwidth restricts the vigorous
development of video broadband business, The hackers wickedly moments of
Internet security threat. Scientists have conducted fruitful research and
development. The next generation of the Internet will gradually opening up Ipv4
and Ipv6 address agreement, Ipv4 address is a 32-bit address is Ipv6, of the
two, 128 from 32 power increased to 262. The next generation of the Internet
network transmission rate will increase than now more than 1,000 times as
foundation, bandwidth may reach 40G bits per second (400 million). The next
generation of the Internet will fully construct strong network security system,
the hackers will not invasion of your network.
On December 25, 2005, China's first generation of Chinese Internet next
generation Internet demonstration project core network (CERNET2) formally
opened, it is the world's largest Ipv6 pure Internet protocol (6) the Internet,
which marks the next generation of the Internet, and the construction of overall
started in the next generation Internet development on first. The next
generation of the Internet first in China for the development of network video
provides the best platform for China's security, and provide a broad space for
development.
(2), application prospects
From the system application on video monitoring system, network
application and prospects, also is not a form can be all-encompassing.
Five, network video server advantage
Undeniable digital hard disk video recorder still is prevent industry
"eldest brother", but the video surveillance network is an inevitable trend.
Network video server has the following advantages.
1, installation and maintenance convenience
Maybe someone said, "now, the network bandwidth and optical fiber to run
the remote transmission, video image transmission speed and quality is better
than the network transmission. However, laying optical expensive cost and
complicated system engineering, let many customers and engineering contractor
unbearable. Due to the popularization of the computer network, the network place
can construct network monitoring systems, installation cost is reduced greatly.
2, use convenient, want to see see
Network monitoring is not limited by time, place and on-demand monitoring,
can selectively designated location of the image, without the need to watch the
image is not transmission, managing network bandwidth resources.
3 and more intelligent
To timely and automatically extract from the video of information that can
transfer and storage, storage, retrieval, machine backup storage, To make the
cameras are only in particular program events to transmit images.
4 and image attenuation, quality assurance
Adopted advanced digital compression technology, digital signal
transmission attenuation, quality is guaranteed. And video signal is simulated
by long distance transmission, signal will decay, need to configure video
amplifier compensation.
5, stable and reliable
Network video server using the embedded operating system, hardware using
high-performance chipsets, steady job.
Six, can realize the wireless network transmission
Using the network video camera, video server to convert digital signal,
signal in transportation, wiring difficult situation, can be established through
the digital wireless LAN, video signals, then send to the monitoring center of
the monitoring center released an Internet remote management department.
Wireless LAN is convenient, short cycle network, less investment, flexible
structure.
Six, network video server developing problems and countermeasures
In current network video server promotion problems need our solution.
1, high-definition video quality and relatively small network bandwidth
The current network resources are limited, broadband network in China's
popularization, the IP address of the relatively short, network bandwidth of
network security, narrow worries are restricted the development of network video
monitoring and bottleneck factor. Especially in remote areas, the network
monitoring are not understood. But in the network popularization, because the
network construction is not suitable for early audio signal flow of
transmission, slow, affect the monitoring results. Especially the video quality
and network bandwidth is a pair of contradictory, usually occupied higher
bandwidth video video quality is better, As the high quality video effect, so
the network bandwidth needs.
A: as soon as possible countermeasures to improve video compression
technology level, select advanced compression standard h.264 video quality and
can solve the network bandwidth this contradiction.
Measures to speed up the construction of two: and the next generation of
the Internet. Our next generation of the Internet in the research and
application of the world have walked in. The next generation of the Internet,
will support Ipv6 agreement to increase as geometric multiples into IP address,
100 to improve the network bandwidth and network speed, and can enhance the
safety of network.
2, the lack of uniform standards, the enterprise fragmented, and products
are mutually exclusive. The development of video encoder can only and the
development of video decoder himself, and supporting the use of other firms
cannot and video codecs, objectively also limits the development of the
industry.
Countermeasures: either by government led by industry, also can be
initiated, breaking partisan, enterprise jointly, experts in industry technical
specifications and standards, open protocols.
3, TV wall component big investment. Video monitoring system and network
video monitoring system, compared to component TV wall, need to input and
network video encoder supporting with the network video codecs, can network
video codecs, through digital conversion function of digital/simulation to
digital signals into analog signals reduction, and then connect up TV wall. Now
a video encoder/decoder network on market price for thousands of yuan,
investment is very big.
Countermeasures: through the establishment of standard technology,
industry development costs, reduce repeated inheritance and development of
semiconductor integrated circuit chip updates, falling prices, thus promoting
network video encoder/decoder technology maturity and prices fell.
Four, the improvement of the quality of personnel. The quality of the
employees for market development level is very important role.
Countermeasures: promoting network video server monitoring system of
intellectual education popularization and improve practitioners, the
professional skills and service level.
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