[PD] Pd/GEM and camera for tracking

jim cinetron at passport.ca
Tue May 12 08:55:39 CEST 2009


I've tried the FireFly under Linux. It worked well. I don't remember if
I tried it with PD/Gem but should be fine. I used Coriander
http://damien.douxchamps.net/ieee1394/coriander/ to create a
videoloopback device for V4L use.
jim


On Mon, 2009-05-11 at 23:02 -0700, Jaime Oliver wrote:
> Hi,
> 
> I am about to buy one of these FireflyMV's. It's 350$ with shipping to
> california.
> 
> Has anyone actually tried them?
> 
> There is a new version with usb2.0, do any of you think it would be
> easier than 1394 to get these working under linux?
> 
> best,
> 
> J
> 
> On Fri, Mar 6, 2009 at 10:06 AM, Martin Schied <crinimal at gmx.net> wrote:
> > 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
> > 60fps at 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
> >
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> >
> 
> 
> 





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