Archive for August, 2011

Ethical CCTV Surveillance

Monday, August 22nd, 2011

The University of Reading is to lead a new €5.3m European Union funded research centre that will examine the social and ethical challenges the surveillance industry faces.

One area the new Centre will examine is the possibility of integrating video analysis and context information to provide privacy-awareness filtering at the camera end, reducing the amount of unnecessary CCTV recording. These cameras can be taught to spot, and in turn record, only people or events of potential interest to organisations such as the police, with the ability to delete irrelevant persons/objects needlessly captured in the image.

This technology would allow both event-spotting-and-alerting as well as recording and transmission, making retrieval of significant images more efficient. This would be particularly helpful when having to examine footage from a huge number of cameras during live situations, such as the recent riots.

The use of video technology in security is a contentious issue with unclear privacy laws. A UK Borough Council recently lost a landmark ruling for using CCTV to spy on the movements of a family to verify they resided in a given school catchment area.

CCTV cameras are an effective tool used by the police to combat crime. However, access to private information about an innocent bystander’s lifestyle that is also captured and may be liberally processed, perhaps for criminal intent, could be construed as dangerous and an assault on their right to privacy. The News of the World’s ‘hacking’ allegations of illegal access to people’s phone messages is a prime example.

Reading and its project partners have established the European Virtual Centre of Excellence for Ethically-guided and Privacy-respecting Video Analytics (VCE VideoSense), the first centre of its type. It brings together leaders in video analytics with the aim of ensuring that ethical and privacy issues are taken into account when developing security video technology, rather than as an after-thought.

Professor Atta Badii, the Director of the new Centre who also leads the Intelligent Systems Research Laboratory at the University of Reading’s School of Systems Engineering said: “The University of Reading and the VideoSense Consortium are delighted to announce the launch of the VCE. Video analytics is a controversial but an important technology. The current phone-hacking controversy has highlighted how vulnerable our privacy is in what is a fast-moving technological world.

“We must ensure that ethical and privacy issues are taken into account so we are afforded both the security protection and privacy respect we deserve, and not one at the expense of the other. With this new European Centre of Excellence, together with world-class research centres in video analytics, privacy law and ethics, we are embarking on a rolling programme of open innovation in socio-ethically responsible technology which shall be ‘privacy preserving’. This will ensure any intrusion on people’s privacy is minimised by design, and not simply assumed to be an inevitable price of national security protection.”

In the meantime organisations should look to installation companies to ensure that CCTV is installed in the most effective manner and protects the privacy of their visitors and neighbours. There are already in place British and European industry standards and codes of practice and reputable companies will have these accreditations and be ready to explain how they adhere to these demanding standards.

High Definition and Megapixel Video Surveillance

Friday, August 19th, 2011

The growing popularity of IP-based video systems in the video surveillance market provides the ability to capture high-resolution images through megapixel video.  With both high definition (HD) and Megapixel systems offering enhanced imaging, there is often confusion as to the differences between these technologies. In a recent article Raul Calderon SVP Marketing at Arecont Vision gives his perspective.


Megapixel Versus High-Definition (HD) camera resolution

HD may be considered a subset of megapixel. HD is defined by specific resolutions at specific frame rates with a specific aspect ratio. Any camera with a resolution of more than a million pixels is by definition a megapixel camera. The lowest resolution in the megapixel range in the security market is around 1.3 megapixels, which provides 1280 x 1024-pixel resolution (or 1.3 million pixels), to resolutions as high as 10 megapixels (3,648 x 2,752 pixels

HD camera resolution

HD refers to cameras with a standardised resolution of 720p or 1080p. The numbers 720 and 1080 refer to the horizontal resolution. Therefore, 720p HD camera resolution provides images that are 1280 x 720 pixels (921,600 pixels – not megapixel), and 1080p HD cameras provide 1920 x 1080-pixel resolution, or 2.1 megapixels. The HD video format also uses an aspect ratio of 16:9 (rather than 5:4 or 4:3), and the frame rate is standardized at 60, 50, 30 or 25 fps (depending on your TV).

IP video systems have momentum

According to a report by TechNavio Insights IP video surveillance is poised for significant growth among end-users and large organisations. The benefits of software-driven functionality and the control, scalability and broad availability of video are often listed as factors contributing to this growth. However, among the biggest performance features of IP surveillance is the ability to provide a broad range of video resolutions. With H.264 compression and programmable resolutions and streaming, the new standard for video resolution can be defined simply as “whatever the application calls for”. With IP/megapixel video, surveillance cameras assigned to cover critical areas can now capture any level of resolution up to 10 megapixel images (3,648 x 2,752 pixels – nearly five-times the resolution of a 1080p camera).

Using combinations of surveillance cameras with varying resolutions

With the ability of today’s megapixel cameras to be adjusted to specific surveillance locations at different resolutions, cameras of varying resolutions can be combined on the same network. Core areas can then be viewed and recorded with higher resolution quality while secondary areas are viewed at less resolution with slower frame rates. Video analytics can also be applied to trigger megapixel streaming only when automatically activated. This approach conserves valuable bandwidth to optimize existing network pipelines as well as recorder storage space.

The higher resolution provided by megapixel cameras also allows system designers to use fewer surveillance cameras to cover larger areas without losing detail, and with reduced infrastructure and cabling costs. In addition to reducing the initial installation costs of a system, these benefits translate directly into greater return-on-investment (ROI) and lower total cost of ownership.

Advantages of IP megapixel video

One of the advantages of IP megapixel video is versatility of resolution performance. Another factor contributing to the rapid rise of IP megapixel imaging is the ease of network system connectivity. Previously, every single surveillance camera had to have a “home run” coaxial cable running to the video recorder, which increased cabling costs exponentially. However, improved networking infrastructure enables connection of multiple cameras with fewer cables, and the use of Power-over-Ethernet (PoE) even allows power to be supplied to cameras on the same CAT-5 cables as video and control signals (rather than needing localised power or a distributed power supply).
The move to megapixel camera resolution

The developments related to H.264 video compression make bandwidth and storage requirements of megapixel images in IP-based systems comparable to those of standard resolution images. Megapixel cameras are also comparable in price to standard-resolution cameras. When you consider the ability to use fewer megapixel cameras to cover larger areas than analogue cameras, the result is a related savings on infrastructure and labour costs. These are all reasons why IMS Research predicts a significant increase in the installation of networked video surveillance systems, and that more than half the network cameras shipped by 2014 will be high-definition or megapixel resolution.

Whether you prefer megapixel cameras or its subset HD based on your specific needs, the wide range of high resolution cameras today provides a powerful palette of imaging tools for industry professionals. It’s crystal clear that better systems are a direct result of the superior imaging possible with these high-resolution camera technologies.

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