Major changes coming in the video surveillance industry

CCTV Handbook 2008 CCTV, Surveillance & Remote Monitoring

Changes in the core technology of an industry always offer new opportunities for the financial community. A major evolution, triggered by the need for higher recording image quality, is taking place in the video surveillance industry.

The financial market has already reacted to it, and the stock value of some newcomers has greatly increased in the last three years. This article is an attempt to explain the reasons and consequences of the current technology change in the closed circuit television (CCTV) market. In contrast to digital still cameras that are already between 5 and 7 megapixels, most CCTV cameras in the US record only in a resolution of 0,1 megapixel. Nevertheless, the change will not only affect the core camera industry, but it will also influence the other CCTV market players. Developers of video surveillance software are confronted with the challenge on how to handle high-resolution images of dozens of cameras with limited PC performance. It is like asking how one PC can run 20 HDTV streams or multiple video games at the same time.

The analogue situation: compatible and low resolution

How nice the world of video surveillance used to be. If you wanted to use the features of a new camera, all you had to do was to unplug the old model and plug in the new one. The TV standard from 60 years ago, based on coaxial cable and BNC connectors, made this possible. All cameras were compatible at the connector, but at best offered only resolutions of 0,35 megapixels (720 x 480 visible TV lines). Because of this, analogue video will never be able to achieve the megapixel resolution of modern digital cameras. This signal compatibility provided an easy way for low-cost camera manufacturers to penetrate and conquer the video market. They did not need to adhere to any kind of software compatibility or image compression, so video technology remained as it was, simple and compatible.

It was also easy to receive video signals on the computer. Video digitiser hardware delivered the required images to a computer-based video management program for displaying, processing and archiving purposes, without using a lot of computer resources. To digitise and store the images of many cameras, the image format was typically reduced to CIF (352 x 240 TV lines) with only 0,1 megapixel. This is the reason why today a cellphone with an integrated megapixel camera takes 30 times more detail than most of the security cameras in the world. The French government brought out a new video law in October 2006, which requires a minimum of 576 TV lines and 12 frames per second for recording. This is still only half the megapixel image, but certainly a first step. However, if this law were in the US, most security cameras would not be in compliance, even six years after 9/11.

Network changed the video paradigm

The arrival of network cameras changed everything. The image format was finally freed from the transmission method, since the same network connection allows transferring both small images and high-resolution megapixel images, just like on the Internet. The key benefit brought by network cameras was the possibility to easily transmit images within the company or globally via the Internet. But since an analogue camera was mostly used for image generation within the network cameras, resolution in the beginning remained as poor as it had always been. There was a downside to using network cameras, however, as it was impossible to transfer raw images due to bandwidth constraints. Instead, the images had to be compressed prior to being transmitted over the network. The camera's video compression chip solved that problem; but the receiving end, at the computer, was where the problems emerged. All of a sudden, video management programs had a new workload: decoding the compressed images.

Insufficient computing power

This is where the dilemma started, since the decoding process required a lot of computing power. While this was still feasible for a single camera, managing a dozen cameras created a real problem, which was solved by sending only small images with low frame rates to computer monitors. In a casino, for example, where full frame (30 Hz) and full TV (480 lines) recording is mandatory, typically two to four cameras can be managed and recorded by a single PC. For that reason this type of video is expensive and needs large, expensive server farms. MPEG-4 also requires enormous computing power, thus restricting the use of high-resolution cameras.

MPEG-4 video streams are stored on the hard disk as they arrive from the camera. Despite high compression ratios, this approach uses a lot of storage, since there is simply no time for reducing the frame rate. Integrating image analysis is also cumbersome, as the MPEG-4 stream has to be converted back to raw images. This is not only a dead-end approach, but it also restricts the use of network technology for high-resolution video systems.

Incompatibility slows down propagation

The problem when communicating with cameras from different manufacturers does not rest in the video standards (JPEG, MPEG) used, but in different protocols. This means that you cannot simply interchange network cameras as with analogue units. Existing camera manufacturers can produce as many cameras as they want; however, the cameras will only be sold once they have been integrated into video management software. Pushing this integration remains an exhausting task, as there are many small software firms providing video management systems, rather than a few large ones.

Decentralised and high-resolution into the future

To solve these problems, manufacturers need to use a decentralised approach for sharing the workload between cameras and video management software. By putting more intelligence, like video processing, motion detection or storage organisation into the camera, the demand for resources from the primary PC is reduced. In such systems, 10 times as many digital cameras can be recorded on the PC than analogue cameras, even in high resolution. In addition, buffering video data in the camera means that it can accommodate bandwidth fluctuations and network failures. Additionally, new megapixel systems are more cost efficient, because one single camera can overview a wider field with more details than an old analogue camera. This new decentralised system design, accompanied by high image resolution, will help camera manufacturers that develop both the intelligent software in cameras and the video management software on computers. This is good news for software-based camera manufacturers, but bad news for the copycats; unplugging the old camera and plugging in the new device will no longer work.

For more information contact Industrial Automation & Control, +27 (0)12 657 3600, burg@iacontrol.co.za, www.iacontrol.co.za



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