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: [email protected] > From: [email protected] > Subject: Re: [PD] Pd/GEM and camera for tracking > Date: Sat, 7 Mar 2009 13:15:16 +0100 > To: [email protected] > > 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 > > > > > > Find car news, reviews and more Looking to change your car this year? > _________________________________________________________________ > View photos of singles in your area. Click Here > http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fdating%2Eninemsn% > 2Ecom%2Eau%2Fchannel%2Findex%2Easpx%3Ftrackingid% > 3D1046247&_t=773166080&_r=Hotmail_Endtext&_m=EXT _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
