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  Optical fiber transmission 5 advantages to solve the high-de>>您当前位置:主页 > Industry-News >

Optical fiber transmission 5 advantages to solve the high-de

作者:admin 时间:2014-05-28 22:04

High-definition network camera represents a surveillance camera in the future. The optical transmission system as the representative of the high-speed network technology is becoming increasingly popular, high-speed network of ultra high speed backbone network and local area across large geographic range has become the norm for real-time transmission facilities, HD image large stream through network has become possible, but rates and fallingspace. These are opened the broad development space for the HD monitor.

High-definition network camera play a decisive role

As we know, the traditional standard monitoring is divided into analog, digital and network three types. Analogmonitor is analog camera, the back-end is matrix. The front-end digital monitoring and analog camera, the back-end is DVR. Front end network monitoring has two kinds, one is analog camera video encoder, a network camera, the back-end is platform. That is to say, the monitoring time, with analog cameras, network cameras, video encoder and other types of front-end analog camera.

The HD video sensor based on CMOS, the direct output of digital video CMOS sensor, direct compression via DSP or ASIC to digital high definition video signal in the camera, and then to the network transmission, than the cameradirectly output high-definition signal is more economical, and higher processing efficiency.

High-definition network camera in give people a clear visual experience at the same time, also put forward higher requirements on the network bandwidth. To get the extensive application, in addition to passive expect networkoperators to make some adjustments, the more need to take some alternatives to alleviate the high-definition videonetwork transmission broadband insufficient contradiction.

1, the use of advanced video compression standard

Active use of advanced video compression standard, ensure with the least amount of data to achieve the best image quality, at the same time, by combining coding image and intelligent technology, using local coding mode, can reduce the HD image transmission required network bandwidth to a considerable extent.

At present, the compression format mainstream has three kinds, respectively is JPEG, MPEG-4, H.264. JPEG is acompression single frame images, single picture of the effect is best, but the network bandwidth resource occupiedlarger; MPEG-4 and H.264 are continuous compression between frames. One of the most popular compressionformat H.264 compression efficiency is the highest, the H.264 video data compression, the need in the process of network transmission bandwidth less.

2, to provide dual stream support

In the realization of HD local video at the same time, the dual stream technology can both reduce the use and guarantee the local better image quality remote transmission bandwidth. HD video camera in remote monitoringenvironment, can provide a high rate stream for local HD storage, such as 720P/1080P coding, a low bit rate streamfor transmission over the network, such as QCIF/CIF code, taking into account local storage and network transmission. The bitstream format flexibly according to the network bandwidth, to achieve local HD storage, network transmission and rear low bit rate. In case of cyber source limited user can obtain, to ensure stable operation of the transmission system.

3, improve the added value of Intelligent Technology

Intelligent technology can improve the monitoring efficiency, it can bring the value of more than that, through coding and intelligent analysis of pre -, embedded intelligent analysis of high-definition network camera module can getvaluable information from the source to the background, can reduce the transmission pressure, truly effective transmission. HD camera to image analysis, and the transmission of the alarm signal to the backend system, which is different from the previous intelligent technology will transmit the image to the backend system and then by thesoftware to analyze the alarming. The way in the past need to occupy too much bandwidth and storage space, and the image signal loss during transmission, prone to false alarms. HD cameras because all signal processing in frontof camera, signal is the most complete, so the alarm accuracy is greatly improved, also can reduce the bandwidth.


4, improve the front-end cache technology

The front-end cache technology to design reasonable, ensure the equipment without loss of image. HD camera data storage capacity is limited, depending on the transmission and the back-end storage equipment. We can through the front-end cache design reasonable, to prevent the loss of data communication failure. For example, in the design of HD video camera system, optional on-board memory or other storage devices, and supports the work offline. In case of interruption of network anomalies, the data can be temporarily stored in a local network, andreturned to normal after a trip back to the server. Can also through the network management technology, to achieve front-end cache network is temporarily interrupted, the network recovered automatically upload video data, so as toensure the integrity of video.

5, establish and comply with industry standards

Monitor market manufacturers need to unite, make some general specification, seek common ground while reserving differences. The Onvif, PSIA and other standardization organizations to see video products and systems of standardization of hope. Video surveillance "plug and play" era that is not far away.

The advantage of optical fiber transmission

With the popularization of network transmission type for monitoring, but also affected by the network bandwidth constraints, transmission performance problems in large-scale remote project, on the current basis megapixels high-definition 720P standard calculation, the stream is about 2 times of that of D1, bandwidth of about 4M, and take the 1080P calculation, the stream is 5 times D1, the bandwidth is about 10M. The 100M Ethernet as an example, in the premise of ensuring smooth, actually also only carry 5 road about HD image, but if the same video source with a plurality of user access, bandwidth will be greater. For Gigabit Ethernet can take several road, for small scale HD monitoring system, can effectively solve, for large projects, will become a stumbling block to the transmission performance.

In recent years, due to the rapid development of optical communication technology, the optical fiber transmissionsystem cost is reduced greatly, so the optical fiber and optical transceiver application is more and more popular in the monitoring system. At present the author investigates discovery, optical fiber has been widely used in family andoffice of optical fiber access network, in the field of intelligent household, office automation, industrial controlnetwork, the airborne and military communication network. High demand for transmission bandwidth, transmission distance of HD video stream, fiber era high-definition surveillance is no longer a dream.

From the viewpoint of development, because of the characteristics of optical fiber transmission, the preferred transmission medium so that the optical fiber as the transmission of Digital HD signal. Optical fiber transmission has the following advantages:

1, broadband, high traffic

Optical frequency band is wide, the theory of 30 Tera Hz, can guarantee the bandwidth and quality of Digital HDsignal. Is the traditional copper cable can not match. This makes the fibers is ideal for high bandwidth datatransmission technology.

2, low loss, suitable for long distance transmission

The use of traditional cable transmission of Digital HD signal effective distance but for hundreds of meters, andoptical fiber can transmit hundreds of meters or even tens of kilometers away. Possesses very important significance for reducing the communication cost of HD signal, improve the reliability and stability of.

3, anti electromagnetic interference, no crosstalk interference, high security

Fiber is an insulator material changes, it does not suffer the interference of lightning interference, the nature, notaffected by electromagnetism, so as to provide a clearer signal than copper fiber; it is difficult to leak out from thefiber optical transmission in optical process. Thus, even though a lot of fiber optic cable, fiber number, also can be realized without crosstalk in optical cable, outside, also cannot eavesdrop on optical fiber transmission of information.

4, light weight, small volume in construction and maintenance

Its tensile strength is good, quality is small, but relatively small, so the cable can enlarge the maximum use of the wiring pipeline rate, and can reduce the installation problems. The following figure we can analyze the benefits of fiber, 1000 1km long double strand 8000kg weighing, and larger capacity of 1km long two fiber weight is only 100kg,which greatly reduces the need for expensive machinery must be maintenance support system, so the fiber to overcopper wire.

5, scalability

System for optical fiber transmission medium expansion ability is very strong, because the pass band optical fiber is very wide, and the corrosion resistant, long service life. Investment forming a physical link, can carry out the system upgrade and expansion on the basis of the original link, only need to replace equipment part, instead of replacing the original optical fiber network. Save the system greatly upgrade cost.

Optical fiber transmission technology provides unmatched flexibility and scalability to meet future needs. Optical fibercan provide much higher bandwidth than the copper wire, which makes it be used more and more for thetransmission of video signals, computer signals and HD signals. Fiber optic technology offers the best solution for HD video monitoring.

With the continuous improvement and development of the monitoring technology, high-definition network camera as one of the main direction of control technology, combined with the optical imaging technology, intelligent analysis technology, network transmission technology bring new change, continue to meet the demand of market competitionat the same time, tend to a perfect self realization. It profoundly affects the monitoring technical field, will profoundlychange the way we live.




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