Long-term since, analog TV monitor for mature technology, product series, the
application to get incisively and vividly. But with the application of further
improvement of imagination, users, analog TV monitor also gradually exposed its
congenital deficiencies: the first is difficult to solve problems, the second
signal transmission distances to achieve more remote monitoring of all kinds of
electricity, the interference of invasive appear more frustration.
Facing the confusion, digital simulation monitoring network monitor,
monitor, and digital network monitor can easily solve signal transmission
problem, long can realize more remote monitoring, and electricity interference
ability also greatly enhanced.
Due to the network video camera and monitor stage in the image just become
protagonist, maybe people to its previous life, is not understand the occasion,
this paper makes a brief introduction.
What is the network video cameras and server
Network video cameras and video server is the traditional network video
technology combined with a new generation of products, besides conventional
camera image capture all the functions, machine also has built-in digital
compression controller based on WEB, and the operating system, the video data
compression, through the LAN encrypted, INTERNET or wireless networks to end
users. And in their remote users can use the standard PC web browser, video
cameras and according to the network server IP address of the cabin, video
cameras and network access servers that can real-time monitoring, and targets of
the scene of real-time image data storage, edit and also can through the network
to control the camera lens, yuntai and comprehensive monitoring.
Network video cameras and server structure
Network camera lens, generally by the image sensor, A/D converter, video
encoder, controller and storage, network video server, external alarm/control
interface components.
Network video camera and the working process of the server is: image
signal input, through camera by the image sensor into electrical signals, A/D
converter signals into digital simulation signal, repass encoder according to
certain coding standard code, the compression under the control of the
controller, the network video server according to certain network protocol
upload LAN or INTERNET, the controller can receive and send to the alarming
signals, and required A control signal.
Network video cameras and server first collection of images. Camera
focused imaging (CCD image sensor to the target surface), but in these images
signals arrive CCD before through optical filter, the light that is can be
displayed.
Network video cameras and server 32-bit cpus, flash and dynamic memory is
network video cameras and brain and heart, the server has function of micro
computer, their common processing camera and network management, communication
between the camera, video exposure, the white balance clarity, and other aspects
of the quality of images. It also includes the management video compression, its
function is the element of these digital image data compression to contain less
as far as possible, and the data, which could realize pack packet network
transmission efficiency.
Network video server to network camera provide 10/100m bit of Ethernet
connection function, it adopts the TCP/IP, your RTP/RTCP, UDP, HTTP related
network protocol that allows users to network by IE browser video cameras and
server's IP address on the network video cameras and access server, watch the
real-time image, and control the camera lens and yuntai.
Network video camera and the external alarm server application
engineering, control interface provides practical for the external interface,
such as control of 485 interface, yuntai warning signal input and output of the
I/O port. Such as infrared detector alarm, then send warning signal to the
network video cameras and video cameras and web server, server automatically
adjust the direction and real-time video camera, On the other hand, when the
network video cameras and server to detect moving target, has also issued a
warning signal.
Network video cameras and server installation
Network video cameras and engineering aspects in the mainly three aspects:
one is the wiring, using the network cabling to transmit images, Second is the
Internet access, to realize the remote monitoring, Third, the main parameter
setting is involved some network parameters.
wiring
Video cameras and install a web server should make full use of existing
buildings and Internet architecture, environment monitoring first examine,
choose the best installation points, then from point to install the laying of
cable network access points, recently adopted RJ45 interface. Network video
cameras and server to recent distance control network access points in about 90.
The Internet also, consider of the installation points.
Internet access
Network video cameras and server to Internet remote monitoring, it needs
to be monitored in the field has a Internet line, for example, ADSL, still need
a broadband Internet access devices, such as a router or firewall. Multiple
network video cameras and server can share a Internet line, general 1 512K ADSL
can take 1 ~ 4 road network cameras and video server, of course, remote effect
is smooth in LAN.
Parameter Settings
Video camera, network and server IP address, authorized to set parameters,
etc, and video according to menu Settings. With IE browser video camera and the
network, network video cameras and server has a server factory default IP
address and manage account.
If you want, at the local video monitoring, which requires 1 computer and
1 set of special software, can undertake 24-hour monitor video. The computer can
use ordinary office computers, need to match hard disk video video images, all
the required reserves by every hour from 150 ~ compressed format different
500MB. Surveillance video cameras and video software by the network server
provides, timing, mobile video footage detection, etc.
On a router or firewall, broadband should set ADSL username, password, and
can automatic dial-up, If there is no fixed IP address, to set DDNS dynamic DNS,
To set port mapping, for each machine network video server mapping camera and a
port 1 IP address can bring more road network video cameras and server, it will
use socket to distinguish.
In computer, remote users with IE browser visit camera, the Internet and
computer can request a legitimate user account of the authorization. Remote
monitoring like a site visit, input domain name, username, password can see the
video image monitoring site. More complex, can design a website hyperlink, click
on the link, you can visit different video cameras and different network
servers.
Video cameras and network server and briefly
In the video cameras and network server should be considered when the
choose and buy, the application of the network environment, and place the
following properties can be made and balance.
1 and transmission of real-time image of bandwidth requirements: this is
the network video cameras and server important indexes of different image and
status (static, normal activities, high-speed motion) and image resolution and
transmit images, the number of frames network bandwidth difference is very big.
2 and video transmission delay sexual: transmission delay inevitable, but
different network video cameras and different values of the server time delay.
Delay will affect the monitoring results.
3, IE monitoring function: use WEB monitoring and management software to
choose, can provide the IE WEB form single image of the prison, video, control
and so on the function, need professional software, in monitoring image choose
without having to enter the camera and network video server IP address, the only
access to the WEB server to download system set in the name of monitoring, the
mouse to click the image can be related to realize monitoring function.
4, image compression algorithm: at present, the main network video camera
and the server is simply compression algorithm, JPEG, mpeg-4 h.264, three. M -
such as JPEG compression algorithm of image contrast is good, but the amount of
data is higher. Mpeg-4, h.264 compression algorithm higher compression ratio,
image high-definition, network transmission bandwidth is small, can be occupied
by remote video transmission of image transmission.
5, whether to support the dynamic IP automatic connection and dynamic DNS
(DDNS) : based on ADSL application environments, telecom providing dynamic IP
access, network video cameras and virtual server can be obtained by dialing to
dynamic IP address to access the INTERNET through computer, monitor the IP
address to access the network video cameras and video server,
6, whether to have ADSL automatic dial-up function: no, only with routers
PPPOE function.
7 and camera performance: the minimum illumination/SNR/level
definition/remote control (white balance, automatic control, backlit
compensation, filter switch etc),
8, whether to support the image adjust brightness, contrast, including:
such as colour,
9 and support type: general D1 resolution, CIF,
10, security mechanism to consider: multilevel password protection
unauthorized users can access,
11, support and monitoring network,
12, whether to support the remote control cloud mirror; RS485
13 and support access: if MODEM, ISDN, XDSL, LAN,
14 and support agreement, (such as TCP/IP, FTP, SMTP, HTTP, SMTP, etc;
DDNS DHCP,
15, whether to support the additional alarm input/output sensor,
16, whether to support the warning message function (send E-mail, FTP),
17, whether to support the software upgrades and upgrade approach (such as
through the LAN),
18 and support from video input/output interface way with,
19, whether to support the video video detection and loss of dynamic
detection,
20 and working environment temperature and humidity.
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