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Closed Circuit Television (CCTV) has been one of the pillars of security systems for decades. Gerardo Chávez Cuervo, responsable de Networking de Lilin, manufacturer of IP video solutions and traditional CCTV for business customers, says in this article that CCTV security systems increasingly rely on IP technology and HD-SDI, which have significant advantages over traditional analog systems.

Comparativa de imágenes de cámaras Megapixel

Comparison of images from Megapixel cameras

Closed Circuit Television (CCTV) system is a composite image transmission, basically, by a number of cameras and monitors, in which signals are transmitted from the cameras to monitors, but, How these devices have improved to suit the markets in recent years?

Until very recently, available technologies for CCTV were limited to two: Analog CCTV IP. For applications where high definition is not required but is required to maintain the low cost, CCTV analog option is a good time-and, will be-and most appropriate solution chosen by the market. Instead, the need for greater definition users choose to abandon the analog CCTV (whose definition, btw, is limited to the old standards of PAL / NTSC) and choose the IP equipment. While using data networks IP teams have no limitation on image quality, in recent times the market has noticed some problems when running a project with IP technology.

These problems are due to compression / encoding - transmission - decompression / decoding image, processes that reduce the quality of the initial image, adding a small delay in the transmission since it was captured by the camera until it is displayed in the monitoring post.

If the installation has not been carefully designed and executed, some bottlenecks in the network and lack of resources software / hardware decoding delay can make the image transmission is even greater. These disadvantages are the defendants by users and produce a certain dissatisfaction, especially where real time monitoring is important. This is where the new HD-SDI standard can make a difference, doing interesting application in places such as casinos, airports, urban safety, banks and other sites with high demands.

What is HD-SDI?

As suggested by its initial (High Definition Serial Digital Interfase) are a standard for transmitting high definition, based on a serial data. These series data travels across a single conductor (coaxial cable to fiber) at a rate close to 1.485Gb / s, and are used to transmit uncompressed digital video encoding and uncompressed. When using a coaxial cable can extend the connection to the 300 m, long as the cable is of good quality.

Since the image is transmitted without compressing and encoding, it has the highest quality for the format and no additional delay is added. This standard is currently used in broadcasting (producing, Editors and transmitters HD TV channels) and thus his success as a means of high definition that is already well tested. Following this, as an additional benefit when applied in CCTV, is that it can use CCD and other components currently used in broadcasting and, whose claims of quality, definition, stability and durability are extreme.

Application and future of HD-SDI CCTV

While systems based monitoring HD-SDI have obvious advantages, there are still some negative aspects that must be resolved. For example, connecting devices over long distances (by coaxial, limitada a 300 m in the best, unless used fiberoptic), the need for increased video storage capacity, the lack of popularity of computers and HD-SDI that are not produced in significant quantities make these costs are very high at the moment. Moreover, where there are special needs required greater definition to a device that can handle HD-SDI (present day, 720p and 1080p).

Over time more manufacturers will probably offer more variety of equipment in HD-SDI. And if the production quantities will lower costs permit devices, making this technology feasible in applications with less budget.

Nowadays, IP technology is one of the main allies in video surveillance and more companies are tending to install this type of solutions. But, What does this phenomenon is due?

• Digitization
The IP CCTV system used is composed of cameras that enable better decisions and higher image quality than analog systems, thus enabling quick and easy recognition of incidents, Access control, fire, among other events. This, coupled with the flexibility it gives the form of data transmission, power sent by a UTP cable, fiber or wireless link, makes can be used for virtually any need that may arise in the market.

• Storage
The cameras have configuration systems, administration and recording video. They also have smart functions such as event search, motion detection, face detection, audio detection, tamper detection, email submissions as alarm notification, among other advanced features such as cameras including iMegapro. Recording is done on the hard disk, image capture is simple, its consistent quality and allows access to videos via IP networks, ensuring greater accuracy of the system can offer another.

• Integration
Systems Closed Circuit TV can incorporate multiple additional devices to the system initially installed to expand the storage of images. The installation and integration of multiple equipment ensures effective control and verification of the installation of video surveillance. The IP systems are not only integrated with other technologies, but also enable remote access to all records in one screen.

• Economy
Contrary to what is believed, IP systems installations are cheaper because the extra wiring costs are lower and consuming, essentially, it allows the use of wireless networks. Not only saving wiring costs, but also the costs of installation and maintenance.

• New market trends
New trends also lead the market to choose HD equipment that provide panoramic views and scenes from different perspectives on live or recorded; all in high definition.

According to the alliance HDcctv, forecasting as to the 2016 -as we can see in the graph represented- market share of analog cameras will be seriously harmed by a loss of up to 20% market share in sales and new products as yet megapixel cameras and HD-SDI cameras grow up 10% market share. New technologies offer more megapixel resolution and image quality, so it tends to thrive in market share and conventional, analog, lose market quick steps.

Gerardo Chávez Cuervo

Responsable de Networking de Lilin Spain







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By • 1 June, 2012
• Section: Computer Security, CCTV