[PD] Pd/GEM and camera for tracking

[Jack]

Good ! Thanx a lot David.
++

Jack


Le 7 mars 09 à 15:40, David Kirkpatrick a écrit :

>
> Hi Jack,
>
> Yep, your chain is right. A minor difference is that I use two BNC  
> baluns (one with a BNC to composite adaptor attached), but it  
> should make very little difference. I also used a UTP cat 6 cable  
> instead of cat 5, but I used cat 5 baluns.
>
> I've used this chain in multiple theatrical projects without noise  
> issues, even with moving lights messing up the ambient light  
> levels. Obviously you would have a dodgy signal if you ran the UTP  
> cat 5 or 6 alongside a 3 phase lead or something, but apart from  
> that you should be fine. I had the cat 6 lead running through a  
> lighting grid full of 240V and it didn't degrade. It actually  
> seemed cleaner than doing everything with coaxial cable.
>
> David Kirkpatrick
>
>
>
> CC: pd-list at iem.at
> From: jack at rybn.org
> Subject: Re: [PD] Pd/GEM and camera for tracking
> Date: Sat, 7 Mar 2009 13:15:16 +0100
> To: djk_1200 at hotmail.com
>
> Hello David,
>
>
> Thanx for all this informations using an analogue camera.
> It's good to know there is FireWire extensions, but it is very  
> expensive (245 pound sterling !).
>
>
> If i understand, the system is like this :
> Analogue camera with BNC -> BNC baluns with power -> cat 5 cable ->  
> composite baluns with power -> composite to FireWire400 converter - 
> > FireWire400 to FireWire800 cable -> MacMini -> Pd/GEM ?
>
>
> I know that analogues cameras are good solutions, but with all this  
> stuff, there is no risk of noise ? ;) (tell me if i'm wrong).
> ++`
>
>
> Jack
>
>
>
>
> Le 7 mars 09 à 06:18, David Kirkpatrick a écrit :
>
>
>
> Hi Jack,
>
> I've done a fair bit of this sort of thing before. The most useful  
> setup i've found is:
>
> 1) Analogue monochrome CCTV camera. (Preferably with around 700  
> horizontal lines or so, very low lux, and self syncing)
> I use these. http://www.allthings.com.au/Catalogue/CCS/monochrome% 
> 20low%20light%20cctv%20dsp%20video%20camera.html
> You can then buy a C or CS lens that is the right angle for your  
> situation. For roof mounted stuff I use an ultra-wide angle  
> varifocal set to just before it noticably fisheyes.
>
> 2) Cat 5 balun connected to CCTV camera's analogue video output and  
> power input. This allows signal to be sent, and power to be  
> recieved via a single cheap UTP Cat 5 lead (i've gone 30 metres  
> with no noticable image quality loss, supposedly you can go much  
> further). Removes the need to run a mains power lead or coax lead  
> to the camera so setup is quick and easy, and reduces time spent  
> dangling from ladders. You can get sets of cat 5 baluns really  
> cheap on ebay.
>
> 3) Second cat 5 balun, on the other end of the cat 5 lead, placed  
> next to computer. Connect to a suitable power supply for your video  
> camera, and connect signal to a near zero latency industrial  
> firewire capture device such as a DFG/1394-1e. http:// 
> www.theimagingsource.com/en_US/products/converters/dfg13941e/ This  
> allows you to hook up to a to a desktop or laptop, including a mac  
> mini.
>
> Then you're done. Just set Pd to listen to the DFG/1394-1e. Image  
> will be clean and roughly equivalent to 720x576 res.
>
> This setup can also be modified to work with near infra-red light  
> instead of visible light if you want to avoid detecting lighting  
> changes as movement. Just tape three squares of primary red and  
> congo blue gel in front of the camera lens. Set up a few PAR56s to  
> flood the space with light. Add the same gel to the 56's as you did  
> to the camera and it will block almost all visible light. People  
> will glow bright white when viewed through the camera, but most  
> other stuff in the space will be close to invisible.
>
>
> Alternately, if you want to use a firewire board camera, you can  
> get something like a Lindy CAT5 FireWire Extender. They aren't  
> cheap but they extend the maximum length of a firewire run from  
> around 5m to 70m without quality loss.
>
>
> Regards,
>
> David Kirkpatrick
>
>
>
>
>
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