Hello Martin and thanx for your reply, In fact, i need a camera to track people in a space (indoor). The camera will be on the ceiling. There is 5 meters between the ceiling and the floor. With the coordinates of people, i will turn on/off differents lamps on a statue placed in the center of the space. So i need a camera working on a MacMini with MacOSX.5 and Pd and GEM. The last MacMini has a FireWire 800 and 5 USB 2.0. I saw the point grey website, but i can't find price on it. However, they talk about 10 meters cable for FireWire 800. Do you know a model and its price ? Today, I tried a Unibrain Fire-i™ Digital Board Camera and it seems good (FireWire 400 : 89 euros + 19 euros with lens) But i never tried it in installation. ++
Jack Le 6 mars 09 à 18:06, Martin Schied a écrit : > hey all, > > Jaime Oliver schrieb: >> mmh, I don't really know about lengths. I think there is a limit >> to how long your firewire cable should be. I usually work with >> analog cameras in linux where cables can be long ad I capture with >> a pci card. >> >> I think a cheap option that I've seen working well with macs is >> the unibrain fire-i: >> http://www.unibrain.com/Products/VisionImg/Fire_i_DC.htm >> >> you can buy lenses and chain them, not more than 30fps though, >> >> J > lengths between firewire 400 devices is usually 4.5m, but you can > daisy chain them up to 16 times giving you 72 metres. it's not very > recommendable to make long chains, as every plug may be a "weak > point" in your chain. firewire 800 can have longer cables, but i > don't know... > > Jack schrieb: >> Thanx for the reply. The models are too big for me. I need a >> smaller camera (something like a cube) because the installation >> must be discreet. Have you something else to suggest ? >> Chris : what do you think about Sony driver ? I can't use a PCI >> card because i will work with a macmini. >> ++ > > as manufacturer of small firewire cameras there's also "point > grey". I don't know exactly about cost, and didn't try them on my > own but they often were recommended by people doing tracking, also > being said they were affordable, especially the "firefly mv" which > delivers 60...@640x480 and even higher frame rates at lower > resolutions. > > that's what they say about macintosh (seems to work): > http://www.ptgrey.com/support/kb/index.asp?a=4&q=173 > > i also made tests with usb webcams (only on linux and windows), > some with usable results but most of them are crap. to be usable > they should support "real" usb2.0 for high frame rates at full > sensor resolution (usually 640x480), without compression and have > ccd sensors for better quality and light sensitivity. (finding out > usb version and other technical stuff can be real pain from > manufacruerer sites, usually you'll have to try them). > image quality was always worse than cheap video cameras - but as an > advantage they were not interlaced like usual consumer video > cameras. cable lengths can be extended by usb hubs or "repeater" > cables several times, but that's also the "many-connectors - many > errors" thing > > @Jack: what exactly will your tracking method be based on? natural > features? colors? markers? with some luck a cheap usb webcam could > be good enough and also really small. (yeah, i'm a fan of using > cheap consumer producs and having trouble with them - be warned) > > cheers, > Martin _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
