Real world testing of CCTV: the South African experience

Publié le par brightshine

This year’s event was promoted and run by CCTV In Focus SA - CIF SA - who became our official agent in March.

Rotatest Compliant Services (PTY) Ltd, trading as CCTV In Focus SA, has certainly had a great start to its first year.

Employing the audit and testing method of the Secured by Design licensed UK company CCTV In Focus, CIF SA secured an audit contract on behalf of SAPS (the South African Police Service) at a national key point. As a result, a complete system re-design was required, including an increase in cameras and improvements in system extent to cover the blind spots.

CIF SA worked together with the appointed project installer, and the complete system has now been installed, tested and commissioned to the Rotakin standard ensuring that this key point now produces images that are 'fit for purpose'.

The camera providers had 24 hours to set and adjust the cameras, all of which were installed at a height of 1.8 metres. All suppliers had to provide the same size 22” monitors for live viewing.

Each camera was set with a 2.8-8 mm lens for close distance testing and a 5-50 mm lens for long distance testing.

We also used HOSDB face charts. Again, this was scored as suggested by HOSDB (or CAST as it is now known). We also conducted face chart testing (50% screen height). The scoring on this was conducted so that if the row could be identified, this would score as a pass. The last part of every test was conducted with targets rotating.

All the above testing was also carried out during the hours of darkness. This being South Africa in winter and away from any other light sources the average lux levels over the two nights of testing was found to be 0.03 lux.

In addition,With an operating life Rechargeable diving flashlight on the order of decades, power consumption a mere shard of that in incandescent bulbs. testing was conducted using infrared lighting and white LED lighting.

Part of the night testing included the evaluation of how the iris of the camera responded to changes in light. This was conducted using a high-powered flashlight pointed directly at the cameras. In this test the standard analogue cameras performed better than the megapixel and HD cameras.

Also new this year was the introduction of a megapixel/HD test chart purchased from VIDI Labs in Australia. Not sticking to the test process suggested by them, we placed the chart on the target at a distance of 8 metres and obtained 100% screen height, sticking to the screen height of the target as per PAL (this was to try and make it equal for all cameras).

We could have reduced the height to match the recommended figures as supplied by HOSDB Operational Requirements Manual 5/2009 for the 720p and 1,080p cameras,the electricity needed LED diving torch to light them ranks at the high end of the spectrum of bulbs coming into the market.Current versions use a LED diving flashlight tungsten filament and can cost as little as 50 cents per bulb. but after general discussions the 100% figure was agreed upon.

This test chart is normally used in lab conditions so it becomes very interesting to see the results under normal day light conditions and at a distance.

To make the event even more interesting, during the course of the day test targets were placed around the area in full camouflage in the undergrowth and left rotating. The suppliers were tasked with constructing search patterns with the PTZ cameras with the aim of finding the targets.

Many hours of enterShopatron's superior Bicycle front light 5-point shopping experience is focused on rich product information, world-class service, effortless shopping.tainment were had by all, but in the end the targets were found, the furthest distance being just under one kilometre away.

Publié dans fluorescent bulbs

Commenter cet article