HD SDI Cameras vs Megapixel Cameras
It is a hot topic widely discussed among manufactures, end-users and media which one will be more suitable for upcoming movie monitoring program between HD-SDI digital cameras and Mega-pixel IP digital cameras as both HD-SDI digital cameras and IP digital cameras can reach megapixel resolutions, and both are hot items in movie monitoring industry. This article is to show Proline UKs opinion.

The article will analyze and compare these 2 items from 6 aspects including operate, prospective, price, user-friendly and stability.


Capability


Network digital cameras can achieve it clip catching, development, movie stream program distribution and storage space, embedded Web page contains movie applications, and brilliant program digital cameras even own brilliant analysis functions. Consequently, program digital camera has all the primary features of it clip monitoring program, so movie monitoring program, in theory, can be constructed by only using the program digital cameras. Some people might not agree with this conclusion: If the program digital camera can build it clip monitoring program independently, what are NVR and VMS for? The reason of NVRs existence is due to storage space prospective shortage of SD cards of program digital cameras, and the chance of SD card storage space safety. As prospective of the SD card keep increasing and program protection technology developing, there will be revolutionary changes of it clip storage space way later on. The VMS system's main operate is to centralized management of devices. This operate can be distributed and deployed to program digital cameras while CPU performance getting greater and greater and the development of cloud computing technology. Therefore, in the program digital camera centered movie monitoring techniques, program digital cameras are the primary of the techniques.


On the other hand, The operate of HD-SDI digital camera is only movie catching, which is identical to the conventional CCTV analogue digital cameras, and only change is the picture improved from D1 to mp . So in the HD-SDI digital cameras centered movie monitoring program, HD-DVRs is the primary of this techniques.


Performance


HD-SDI digital cameras supporters will emphasis 2 points: picture quality and latency of stay movie.
HD-SDI Cameras stay movie has not been encoded, the picture quality is better than program digital cameras in principle, but it is only has mathematic meaning. As there is limitation for human eyes to identify picture details, so there is almost no difference between megapixel program digital cameras and HD-SDI digital cameras.
As for latency of stay movie, it basically doesnt exist for HD-SDI digital cameras. While for program digital cameras, the theoretical latency of program digital cameras at 30fps is 140ms, and 60fps is only 70ms. However, in actual applications latency of program digital cameras is normally more than one second because of unstable program, If program digital camera developers pay enough attention to this issue and finally reach this theoretical minimum latency, then there is no practical difference between IP digital cameras and SD-HDI digital cameras.


Cost


A transmitter component, which modulating megapixel movie alerts to HD-SDI alerts, is needed in HD-SDI digital cameras, while HD-DVR has a corresponding recipient component which demodulating HD-SDI alerts to megapixel movie alerts, this is expense for HD-SDI program, but several HD-SDI digital cameras can discuss one movie development processor of HD-DVR, while every program digital camera needs an separate movie development processor. If it is possible to make price down the several route megapixel movie development snacks, it will compensate the extra transmitter and recipient price of HD-SDI techniques.


At present, the price of HD-SDI modulating processor is high and the price of several route megapixel movie development snacks are also high, which leads to a heavy price for HD-SDI techniques. Anyhow, the processor price is depending on volume. So which kind of digital camera has cheaper will be decided by business.


User-friendly


A prospective advantage of HD-SDI centered movie monitoring techniques is that conventional monitoring techniques can easily upgrade to new one by just replacing analogue digital cameras and DVRs with HD-SDI digital cameras and HD-DVRs. However, the bandwidth of HD-SDI indication is far beyond the analogue movie indication. The re-wiring may be needed if the current coaxial-cables is not good enough. This the chance of this issue is still uncertain.


Current society is an details society, all new buildings have considered a layout of details factors, and it will become very easy to construct a IP program centered movie monitoring program. HD-SDI supporters sometimes claim the conventional installers have no idea of IP program. Actually, it is not as hard as they imagine. A lot of program integrators are considering expand to movie monitoring, which will help program integrators of movie monitoring greatly on the program construction. The advantage will be more obvious for those integrators with encounter of program construction as the merge of it clip monitoring and users other computer are increasing all the time.

Some people are complaining the complicated configuration of program digital camera. Actually, it is not a Inherent issue for program digital cameras. IT items user-friendly is up to the software design. By optimizing the software this issue can easily be solved.


Reliability


In a HD-SDI centered movie monitoring program, an separate subsystem consist of a HD-DVR and several digital cameras connected, Failed HD-DVR will lead to all related monitoring factors ineffective. In a program digital camera centered movie monitoring program, every digital camera is an separate subsystem, there is no depot point, so IP monitoring program is with greater stability.


Remark


Some DVR manufacturers prefer to support HD-SDI digital cameras because they wish to maintain the existing DVR business and items encounter. The players from IT industry usually prefer program digital cameras because they expect to optimize their encounter in networking industry. Which is the long run, IP digital cameras or HD-SDI cameras? Proline UK thinks that it s not necessary to make any final conclusion . What we need to do is to keep our eyes on both with an open mind. By analyzing both their advantages and disadvantages we can have a better understanding of movie protection industry and can keep on providing customers with near-to-perfect movie protection solutions.