of adding analogue cameras to an IP/ network based video surveillance system, and HD-SDI cameras which allow the transmission of uncompressed and non- packetized Full HD (1080P) video over analogue cabling.
Technological Solutions HD Megapixel cameras offer a lot more than just remarkable ‘evidence’ quality images and a helpful display aspect ratio. They also come with a range of other features which equip operators to respond more effectively to any suspicious activity or emergency. Most of these ‘added value’ features are likely to be incorporated into a camera’s DSP chipset. The Samsung WiseNetIand WiseNetII DSP chipsets, for example, have been designed specifically to allow users to gain maximum benefit from megapixel camera technology. Although megapixel cameras can
capture very detailed images, one of the benefits is that there is the option to simultaneously transmit images at lower resolutions which include QVGA (320 x 240), VGA (640 x 480) and SVGA (800x 600) and with multiple compression methods available, different authorised users are able to simultaneously monitor live images at one location, record video
evidence at another or view live and recorded images on a Smartphone. At the same time, JPEG images of an incident can be attached to an alarm email notification with the additional facility of storing pre and post-alarm images on a camera’s internal SD memory card. Of course, more often than not,
users do not require the highest of resolutions across their entire site and it always comes back to understanding the operational requirement and then specifying cameras to match the specific requirements of the project. A security system will nearly always use HD megapixel cameras where they are required, coupled with standard resolution cameras for general overview purposes.
Progressive Scan It can be quite frustrating for end-users who have invested in PTZ domes, only to find that images captured when the camera is on the move, lack clarity, or have what is referred to as motion blur effect. If the end-user is an airport or port or is involved in some other mission critical activity, video recorded from a PTZ dome which is of a poor quality is likely to reduce confidence in a video
surveillance system which might be expected to provide identification grade images. Car parks, industrial estates and retail parks may not be regarded as high security applications, but they are environments where PTZ cameras are commonly installed and where blurred images can seriously impact on the ability of security personnel to make fast and effective decisions when an incident or emergency is taking place. Fortunately, yet again, technology has come to the rescue. A feature called Progressive Scan optimises high quality video capture and provides sharper image edges. The improvement is most noticeable on paused images, providing picture-perfect stills of, for example, number plates without any blurring.
HD-SDI Technology Until now, the capture, viewing and recording of high definition images has been synonymous with IP network systems. The technology however built into recently introduced HD- SDI cameras and DVRs allows the transmission of uncompressed and non-packetized Full HD (1080P) video over analogue cabling. One of the main benefits of this technology is that there is zero loss of image data and zero latency when viewing images. This makes the cameras ideal for applications where evidence grade images are required, such as airports, ports, banks, casinos and retail environments, but where is it not viable or cost effective, to transmit the images over a network.
Conclusion Whilst it is inevitable that in the future the vast majority of video surveillance systems will be IP based, there will always be situations where an analogue based solution best meets the requirements of specific projects. HD-SDI technology makes it possible for installers to offer their customers all the benefits of HD megapixel cameras without having to have any specialist knowledge of Ethernet cabling, switches, hubs and servers associated with IP based systems.
Activity on a site can be monitored from anywhere in the world.
www.netcommseurope.com NETCOMMS europe Volume III Issue 1 2012 23
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