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Network Camera, A New Favourite IN Future
2008-08-14

Network cameras are analogue or digital video cameras, plus an embedded video server having an IP address, capable of streaming the video. Along with the development of network, Network camera grows rapidly. It can spread image to other end of the earth through the network and the remote viewers do not need any specialized software. Only has a standard Web browser (such as Microsoft IE or Netscape) can they monitor their images conduct video.  Looking back video surveillance, it has suffered from low-resolution analog video monitor to the current high-definition digital monitoring. Although the current digital monitoring has not been able to completely replace analog video, video surveillance network is being in a very developing at an alarming rate. At the same time, more and more customers are favor to IP monitor. How to choose IP cameras Image quality Image quality is the soul of camera, which is one of the key index of advisement. Good image quality needs the good camera and imaging devices. The camera image quality of lens will affect the quality of signal outputted by imaging device. 1 lens Lens have many range and even the same type of lens, the image quality also have great differences, which is mainly due to material quality, processing accuracy of different lenses and other factors. At the same time it also lead to different grades of the lens prices From several tens of million yuan to the great differences. A good lens will have a very good performance at the various aberration correction, the sharpness, aperture factor and so on but its price will be high as several times and even 100 times. Image aberrations affect great image quality. Common aberration has following: spherical aberration, color, astigmatism and distortion. So lenses commonly used now are multi-chip, multi-coated lenses and multi-storey structure and its purpose is to solve the problem of aberration, making sharp image clarity, color fidelity. 2 CCD or CMOS CCD and CMOS have main difference in the manufacturing: CCD is integrated in the semiconductor crystal materials, while CMOS is integrated in another material known as metal oxide semiconductor material. They have no distinction at the principle. At the manufacturing process, CCD manufacturing process is more complicated and only a few manufacturers such as Sony, Panasonic, Sharp and other master this technology, so the CCD camera will be relatively expensive. In fact at the actual results, the gap of the current CCD and High CMOS is very small. The CMOS manufacturing costs and power consumption must be less than CCD, many low-grade camera manufacturers use ordinary CMOS sensitive components as a core component. In the same pixel, CCD imaging permeability and the sharpness are very good, in other word, color reproduction and exposure can guarantee the basic accuracy. But common the products of CMOS have general permeability and the capability of color reproduction is weak. Because of their own physical characteristics, there is a certain imaging quality gap between the general CMOS or CCD. However, due to low prices and high degree of integration, the low-grade CMOS camera has been widely used in the field At present, many low-end entry-camera use cheap low-grade CMOS chip, therefore, image quality is rather poor. CCD and CMOS merits can not generalize, but now, widespread used in the area of surveillance cameras, image quality of the CCD camera chip is better. Camera functions From this year's Several times exhibition, we can clearly see the trend of products that IP cameras are no longer limited to guns or desktop models. Along with the maturity of IP camera technology and the increasingly strong user demand, IP cameras also multiply A lot of kinds and gradually are moving toward market segments. Now not only on the market almost all the form of traditional cameras have a corresponding IP cameras, but also There are more varieties of derivatives for network transmission characteristics. With the development of technology, IP cameras will not be able to assess the development of space. As the level of market’s maturity continuously raises, IP cameras have extensive features and functions. Be clear to their basic functions, you Users boost checkmark Admission to the market to find the appropriate product. Limitative factors One of the factors: the bandwidth  Transmission bandwidth is the biggest bottlenecks at the network application of IP video cameras. Despite the current IP camera has H.264 compression, dynamic stream and other data traffic control technology, it is undeniable that to obtain a higher image quality it will certainly require a higher network bandwidth. According to the current compression technology, it is no problem to transfer megapixels images on the LAN. However, the current transmission pattern in the WAN: ADSL is limited by the technical and the actual upstream bandwidth is generally in about 512 K; Data or the cost of fiber is high. ADSL upstream bandwidth can only transfer barely the D1 real-time images at low quality. But as the technology advances, universal IP megapixels camera has been in close proximity, so IP video transmission become a big problem, because it is impossible for us to install local area network or fiber for each A video camera But we can believe: with the application of new technologies, modes of broadband access network innovation and the universal application of new technologies such as ADSL2 +, VDSL2, upstream bandwidth can reach a maximum 26 M. The two factors: cost Although the overall cost of IP cameras’ equipment in multi-channel and long-range is lower than the traditional control method, under standard definition requirements, the cost is higher than that of traditional cameras and DVR approach in a small area. This is only the calculation of the cost difference between the front-end cameras and video equipment. Relating to long-range approach, if ADSL lines can not meet the high-definition transmission, the rent of fiber broadband will result in high cost. This will directly affect whether that customers choose IP cameras. It seems this issue is currently in the breakthrough, with the rapid increase of output, IP cameras will continue to decrease costs, the network has gradually decreased costs. The fourth factor: the price Any wireless camera in the face of the coverage area beyond the line of control, it will encounter a problem that is long-distance transmission. Usually in the order of magnitude of the dozens of kilometers people general would choose wireless approach, A transmission distance of 20 km of broadband transmission equipment is the price of a few million, so this is definitely not the best solutions. If the 3 G's access costs quickly reduced to a certain extent with a wide range of applications, it will have a far-reaching impact o the existing transmission network video surveillance. Without the shackles of the line, coupling with the advantages of bandwidth, 3 G times will subvert the traditional monitoring pattern. Closing remarks IP camera has the advantage of being remote video monitoring of technical superiority, thereby it can expand the scope of application of image control, strengthen the management of the remote video images, video, information sharing. But the face the bottleneck problems, the most we talk about is: network bandwidth, image quality, delay, the system software compatibility, prices and other issues. Some of these issues have been improved, but some have not made substantive breakthrough. With the network infrastructure equipment constantly update, network video technology are improving. The 2008 Olympic Games which have been held in Beijing and the 2010 World Expo which will be held in shanghai will create a huge security monitoring market , And be one of the favorites as a new generation camera technology and network technology, network camera will achieve incalculable development and progress.

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