Posts Tagged ‘security cameras’

CCTV Surveillance Facts?

Thursday, March 5th, 2009

CCTV Surveillance Camera

CCTV camera statistics are often quoted to illustrate how we are all watched by 300 cameras a day, and how many millions of security cameras there are in the UK.

We’ve commented on these ‘facts’ previously and pointed out that they never seem to increase since we first quoted them over five years ago, and wonderment at how these numbers of installed surveillance cameras were ever established?

There was an interesting piece in The Guardian yesterday by Paul Lewis, with many links to research and the original documents that first cited (in some cases made-up) these claims.

David Aaronovitch has been snooping on statistics. His mission: to get to the bottom of the dubious claim, often quoted as fact, that the average Briton is caught on 300 CCTV cameras a day.

The statistic is fiction. Or at least was written as such when it first appeared in 1999 in the book The Maximum Surveillance Society. The author, Sheffield University’s Professor Clive Norris stated clearly in the book that the “contrived account” of a day in the life of a man called Thomas Reams was “a fictional construction” designed to mirror the reality of routine surveillance. That important detail appears to have been lost when the estimate was referenced in a landmark study for the Office of the Information Commissioner.

The original detective work of chasing these stats was carried out by David Aaronovitch in an article in The Times:

The mystery stat was sitting on one of our Times blogs and read “the average Brit is caught on security cameras some 300 times a day” and, God knows why, I just decided to chase the number down and find out where it came from. The colleague responsible for the blog referred me to a couple of news stories, and to a document issued by the office of an important and newsworthy quango.

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Olympic CCTV Plans already causing an upset …

Wednesday, January 14th, 2009

2012-cctvThe 2012 Olympics CCTV system in London will inevitably be a pretty big deal.

We spotted this article over on the SKY News website.

Number-plate recognition cameras as well as private networks, such as those of a shopping centre or car park, would all be accessible to allow authorities to track suspects throughout the capital.

Advanced computer intelligence systems would assist officers by filtering out all but the most relevant CCTV feeds coming into the control room, reducing time normally spent scrambling from one camera to the next.

Essentially it is what our fellow security experts across the pond call managing situational awareness, and what we would probably term sorting the wheat from the chaff!

We’re not sure why using pre-existing CCTV camera feeds more intelligently should upset Liberty, and wonder how upset they’re going to be when the final additional camera count for the City of London is totted-up?

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Sanyo HD 4000 Four Megapixel Full HD CCTV Camera promo site

Tuesday, December 23rd, 2008

Sanyo VCC-HD4000 4 Megapixels Full HD Network CameraSanyo have launched a new 4MP HD CCTV camera – their model VCC-HD4000.

They’ve built a rockin’ promo website to launch this new IP CCTV camera (switch your speakers on!).

It’s got a great specification, including:

  • 4 megapixel camera
  • built-in 10X optical zoom lens with auto-focus
  • 16X digital zoom in addition to the optical zoom
  • Day/Night capability with IR cut-filter
  • Dual stream H.264 and JPEG
  • POE (Power Over Ethernet) ready
  • SD memory card slot for video storage at the camera
  • USB port for direct attached USB HDD
  • HDMI port

Sanyo VCC-HD 4000 IP CCTV Camera now available to buy online from our webshop.

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Lux Light Level Chart

Monday, December 1st, 2008

Lux light levels chartLux levels are quoted by all IP camera manufacturers to indicate the low light level capabilities of their cameras.

The problem is that the lux scale means nothing to most of us, and we are often asked to give an indication of just what is meant by 1.0 lux or 0.01 lux.

Somehow, us saying “quite dark” or “very dark” never seemed very satisfactory!

We checked with Wikipedia:

The lux (symbol: lx) is the SI unit of illuminance and luminous emittance. It is used in photometry as a measure of the apparent intensity of light hitting or passing through a surface. It is analogous to the radiometric unit watts per square meter, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human brightness perception. In English, “lux” is used in both singular and plural.

That’s that cleared up then! ;-)

We don’t really think that the information on the Wikipedia page is quite what our CCTV camera enquirers are looking for, so we’ve created our own lookup lux chart with indicative pictograms to give you a visual representation of relative lux light levels.

Click the link to view the chart as a pdf – Lux Light Level Chart.

We hope that’s helpful?

You might also be interested in our article on IRE and Lux Levels.

If there’s any other CCTV terminology that we can de-mystify for you then please feel free to get in touch and let us know. You can use the comments below or visit our IP CCTV Forum.

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Megapixel Definition

Tuesday, November 25th, 2008

Megapixel resolution – what do we mean by megapixel?

Before network IP CCTV cameras came along the resolution of traditional analogue CCTV cameras (connected by co-ax) was measured in TeleVision Lines (TVL).

This TVL parameter indicated that if you ran your finger horizontally across a CCTV image this would be the number of vertical lines that you would be able to resolve. Obviously, the higher the number the greater the level of detail indicated.

The highest specification analogue colour CCTV cameras currently available can resolve to 540-560 TVL. Monochrome (black & white) analogue CCTV cameras perform slightly better and the best will claim somewhere around 620TVL.

Just to put these analogue TVL figures in perspective with the current IP camera performance – 540TVL is equivalent to 0.4 Megapixels.

Pixels is a term of resolution used commonly in the IT world. Computer monitors will have their resolution specified by means of a horizontal and a vertical pixel resolution e.g. 1440 x 900 pixels.

Digital still cameras also express their resolution capability in terms of pixels, of course nowadays these too all deliver megapixel images.

A typical megapixel IP CCTV camera might have a resolution specification of 1920 x 1080 pixels.

If you multiply the horizontal (1920) by the vertical (1080) pixels you get a total pixel count of 2,073,600 pixels.

This value may also be expressed as 2.073 Megapixels (Mega equals millions).

It is interesting to note that the co-ax connected analogue CCTV camera has been stuck at or below the current glass ceiling of 560TVL for about the past five years.

In an era when you can readily purchase a mobile phone with a built-in 8 megapixel camera, why would anybody install a security imaging solution based upon co-ax which is unlikely to ever exceed 1/20th of the performance of a mobile phone?

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