Gemma

On Tue, Mar 6, 2012 at 2:12 PM, Rodrigo Jose Firmino <[log in to unmask]> wrote:

Gracias Gemma,

Permissions and the way cameras are installed in Brazil won't be a problem for my survey as there is NO need to applying for permissions before installing any camera by any person (as long as they're within a private spot, even if it's pointed at public places).

BTW, do you have anything published about your survey?

Abrazos,

Rodrigo.

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Rodrigo J. Firmino
Professor em Gestão Urbana, Arquitetura e Urbanismo

Pesquisador CNPq

Programa de Pós-graduação em Gestão Urbana - PPGTU
Pontifícia Universidade Católica do Paraná – PUCPR
Av. Imaculada Conceição, 1155 - Prado Velho
Parque Tecnológico, Bloco 3, 2o Andar
CEP 80215901, Curitiba - PR
Tel.: +55 41 3271-2623

www.pucpr.br/rodrigofirmino

www.twitter.com/rodrigo_firmino

urbe - ISSN 2175-3369 | www.pucpr.br/urbe
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Em 06/03/2012, às 09:48, Gemma Galdon Clavell escreveu:

Also, bear in mind that some cameras 'obscure' certain areas due to privacy requirements... Impossible to know about this just by looking at them though.

Doing my field-work on CCTV in Spain, I reviewed the forms all public cameras have to submit to get permission to be installed, sating square meters to be surveilled, and pictures of the area to be surveilled. In my experience, they make up the numbers, using surface of area to control, and not real capabilities of the camera.

Some of the pics I have are very interesting, as they make you realize how invasive public surveillance is in your daily life in public space -they'd be great for an exhibition! Unfortunately, I cannot share them due to privacy concerns - :)

Gemma

On Sun, Mar 4, 2012 at 2:49 AM, Rodrigo Jose Firmino <[log in to unmask]> wrote:

Hi Dave,

Many thanks. Yes, it is useful. I found lots of "calculators" and the like around, and also some interesting piece of software that graphically show you how the scene will be: "CCTV design software" (check this out: http://www.jvsg.com/ip-video-system-design-tool/).

So I guess there is no one "magic number/angle" to be used and I'll have to learn a bit more about the specific types of cameras being surveyed in order to have a more precise map.

Best,

Rodrigo.

Em 03/03/2012, às 22:14, Dave BROOKS escreveu:

Hi Rodrigo
The UK Home Office SDB produced a good docuemnt back in 2003ish detailing percentage of what FOV you require to achieve ceratin outcomes. Check out their the UK Home Office Scienetific Development Branch web site.

I also use DRI (Detect, Recognise, Identify) with percentage of screen size. There should be plenty of similiar info around, as I am out of office at the moment and do not have access to my documents.

Hope this gives you a pointer.

Regards

Dave
Security Science
Securitty Research Centre
West Australia

________________________________
From: Research and teaching on surveillance [[log in to unmask]] On Behalf Of Rodrigo Jose Firmino [[log in to unmask]]
Sent: Sunday, 4 March 2012 8:43 AM
To: [log in to unmask]
Subject: CCTV "field of view"?

Dear all,

Does anyone know of any good/easy reference to guess an average "field of view" (FOV) for outdoor security cameras? Or is this not possible at all?

I realize that a combination of the kind of lenses and microships that different cameras have, result different FOVs (there are calculator for this: http://www.sweeting.org/mark/lenses/cctv.php), but I wonder if there is anyway to tell an average measure (in projection). I am surveying private cameras looking at public spaces and wanted to have an idea of how their FOVs can be drawn up on a map.

Any help, at all, would be most welcome.

Cheers,
Rodrigo.

-------------------------------------------------------------------
Rodrigo J. Firmino
Professor em Gestão Urbana, Arquitetura e Urbanismo
Pesquisador CNPq

Programa de Pós-graduação em Gestão Urbana - PPGTU
Pontifícia Universidade Católica do Paraná – PUCPR
Av. Imaculada Conceição, 1155 - Prado Velho
Parque Tecnológico, Bloco 3, 2o Andar
CEP 80215901, Curitiba - PR
Tel.: +55 41 3271-2623

www.pucpr.br/rodrigofirmino<http://bit.ly/rodrigofirmino>
www.twitter.com/rodrigo_firmino<http://www.twitter.com/rodrigo_firmino>

urbe - ISSN 2175-3369 | www.pucpr.br/urbe<http://www.pucpr.br/urbe>
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