About-network-video:
video-solution:
Related-links:
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| Several digital monitoring
programmed of contrast solution
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Such programmes can be broken down into three sub-First, a few die with
"soft-network" of the programme, is the number-two combination of "centralized
control" of the programme, three die with a few "hard and soft network"
programme.
Die combination of several "soft group net" programme
DVR scattered in various regions (such as building a room, hard disk
recorder in which this relatively close to the front of the video source).
Ordinary collection of video cameras (analog) into the first hard drive
recorders, in which the completion of A / D converter, video compression and
network upload, video files stored on the hard drive. All the hard disk video
recorders have access network, the monitoring centre in the allocation of one or
more PC, PC to complete through remote monitoring, online video playback, file
backup, Haeundae-control functions. The programme similar to the all-digital
network camera programme, the difference is the use of a common front of the
camera and video stored in the front of the hard disk video recorders,
monitoring centre PC is no longer a video store. Its merits as follows:
1. Ethernet transmission of digital video without a direct video stored
on local hard drives, to avoid a network error, delay the impact of video
quality;
2. DVR use of RTOS operating system and the JFS file format,
the stability of the equipment itself, not Dead, free from viruses, is a
dedicated video recording equipment. Unlike the general use of PC operating
systems and WINDOWS FAT32 file format, stability and security are not
guaranteed;
3. Use of TI (Texas Instruments) DSP microprocessor to
complete the video compression using MPEG-4 compression format, is very suitable
for transmission on the network;
4. Front-end use of ordinary camera,
video images collected by network cameras better than good;
5. Demand
the use of Internet users access to hard drive recorders, will not be broadcast
because of turmoil caused by network congestion;
6. Video recording the
distribution by the front-end to complete more than one hard disk recorders,
control center no longer afford the image records, from the centre of the large
storage costs;
7. Does not require front-end local control can be set to
unmanned stations, cost savings;
8. Center for video files, can be directly
online playback, or download the first video to the local hard, the effect of
video playback is guaranteed.
Network Video Server
Its shortcomings:
1. Ethernet as the high error rate, the central monitor picture quality
can not be guaranteed. Because the network delay will cause some delay;
2.
Bandwidth can not be guaranteed. Because of insufficient bandwidth, the center
monitor screen easily Diuzhen;
3. Ethernet transmission of video is
compressed (General is the use of MPEG-4 compression), which is lossy
compression, the center will monitor screen distortion.
It applies to
video saved on the high quality requirements, and for monitoring the quality of
the general requirements of the occasion, such as monitoring and
management-level less to the economy as the starting point of the electricity,
public security, the bank's focus on network monitoring projects. Die with a few
"centralized monitoring" programme
In this scenario, hard drive
recorders in the monitoring center, all the video signal (analog) to enter
through the video of which (if the far distance, we can use optical
transmission). In which the completion of A / D converter, video compression and
network upload, video files stored on the hard drive. Monitor screen output to a
TV monitoring center of the wall, the monitoring centre in a PC configuration
for video playback, video file backup, the preservation of important screen
printing. Its merits as follows:
1. Monitoring good picture quality. The
programme is monitoring the screen, image compression, without a direct,
therefore monitor screen is no delay, no tailing, low distortion, without a cut,
clarity of up to 640 X 480;
2. Video files stored on local hard drives,
video recorders, due to the JFS file format, unlike the WINDOWS operating system
used in FAT/FAT32 file format, free from viruses, stability and security are
very high assurance;
3. Use TI's DSP and RTOS operating systems, the
equipment itself the stable performance, high reliability, security, good;
4. The programme is not real-time monitoring through the Internet, so
would not be affected by the impact of the network environment (Ethernet itself
has many defects, such as insufficient bandwidth, high error, the network delay,
etc.);
5. Using ordinary cameras (Panasonic or Sony), the acquisition of
the video image better than a good network cameras;
6. All hosts are
located in the monitoring center to facilitate the management and maintenance;
7. System control through a dedicated keyboard, a keyboard can be more
flexible control console, can cascade to other sub-control points, host the
video output interface rich, so the cost of different requirements of the
various sub-control and display applications, Have a very good adaptation;
8. Host of the network transmission functions can be controlled at any
time to expand the network, regardless of location restrictions.
Its
shortcomings for the front-end video monitoring center to use analog
transmission, distance and layout has also been restricted, otherwise it will
increase the cost of expenditure.
Applicable to the monitoring points
from the close monitoring from the centre to monitor the strength of higher
demand for security monitoring; to focus on security monitoring and management
for the main purpose of controlling the management of other departments for
secondary purposes, such as smart buildings, hotels, commercial plazas, museums
, And other building facilities. Die with a few "hard and soft network"
programme
In this scenario, hard drive recorders scattered in various
regions, close to the front of the video source. Ordinary collection of video
cameras into the first hard disk recorders, complete A / D converter, video
preservation, and local control points. In addition, each DVR restore two-way
video output (all the way to multi-screen composition, all the way to switch to
single-screen) by simulating Guangduan Ji access control centre, but also access
LAN. Monitoring Centre is located in the control of the keyboard and the TV
wall, completed on the lower level of the various regions of concentrated
surveillance, Haeundae-control. At the same time targeting a single PC, complete
the online video playback, file backup.
Web-users, through more than one
PC to complete remote monitoring, online video playback, file backup,
Haeundae-control functions. Its merits as follows:
1. Pm local control
and centralized control has very good picture quality assurance. Whether the
control center or the monitoring center, image compression, without a direct,
therefore monitor screen is no delay, no tailing, low distortion, without a cut,
clarity up to 1024 X 768;
2. Video files stored on the local hard drive
recorders, the equipment itself the stable performance, high reliability,
security, and video guaranteed, 3. Monitoring Centre to be completed on all
points of the cloth monitoring, the control center to be completed in the region
The monitoring, control center to monitor the centre only two-way video, saving
wiring and construction costs;
4. Cascade can control the keyboard, the
control center and monitoring centres to share the same physical link, saving
cabling costs, also set by user name and password management at any time at the
scope of management control;
5. Using ordinary cameras (Panasonic or Sony),
the acquisition of the video image better than a good network cameras;
6.
Monitoring Center screen monitor, Haeundae-analog control, quality, and without
delay. Video back to check on a network online, from the second video equipment
spending;
7. At the local control center is close to the front of the
monitor, for the time of the incident emergency response to the rapid
decomposition of the day-to-day control center monitor strength;
8. The
day-to-day monitoring intensity is not high and the overall need to monitor the
location, the establishment of the centralized control network, monitoring the
day-to-day strength Yaoqiubugao also need to control the part of the location,
network-based control. More advanced models have a variety of screen
composition, composition, switch the order interval can be personalized
settings.
Its shortcomings for complex cabling, to monitor cloth points
more scattered, isolated from the more remote monitoring center, import and
export more factories, schools, prisons, the freight yard, the Intelligent
Community Monitoring, adapted to the multi-level multi-user management needs.
Day-to-day monitoring of the use of high intensity simulation methods to monitor
the intensity of use of part of the lower number of ways. At the same time take
into account the cost of security and management needs.
In sum, the
above options have their advantages and shortcomings, mainly from the practical
requirements of security monitoring and management structure, consider the
situation of network, security and environmental monitoring, control and the
video quality is first and foremost, the network should be structured With the
reality of change.
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