[PD] Pd/GEM and camera for tracking

[Jaime Oliver]

did you get the full 125fps?

On Mon, May 11, 2009 at 11:55 PM, jim <cinetron at passport.ca> wrote:
> 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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>>
>>
>>
>
>



-- 
Jaime E Oliver LR

joliverl at ucsd.edu
www.realidadvisual.org/jaimeoliver
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