Would it be posible to use PD together with a webcamera to follow a persons position in a room?

I want to send midi-control-values to ableton Live depending on a persons movements in a room. At the moment Im using arduino and a ping-sensor for the purpose, but I would be able to make much more complex stuff if I can follow the movements on more than one axis.

Im still a beginner in PD and I guess if its possible this would be kind of advanced stuff, but then I have something to work on! All tips or ideas regarding this are very welcome.

have a look in the help > Browser > examples > GEM > advanced > motion tracking

(something like that)

I find Processing(.org) a better application for handling the video, then you can cross communicate via the Open Sound Control protocol

I found a library named gridflow that seems to be great at doing what I want, anyone here who is using it?

I think I installed it right and everything seemed to work, until I come to the part with the motion tracking. There is an example named multiblob that is supposed to do just what I need, I get picture from the built in camera in my macbook pro (OS X 10.6.2) but the crosses that are supposed to follow the motion dont show up.

Anyone got any idea why?

I attach the patch and a picture (in a new post) that I found that shows what its supposed to be able to to.

http://www.pdpatchrepo.info/hurleur/multiblob.pd

...and the picture...

http://www.pdpatchrepo.info/hurleur/multiblob.png

anyone who downloaded the patch who got it to work?

i tried the multiblob object, but somehow didnt get the results i was hoping.
i ended up using eyesweb for tracking and send the xy coordinates to pd via osc.

has anybody worked with openCV...i think i read somewhere its already implemented? is that true?...looks great for tracking stuff.
http://opencv.willowgarage.com/wiki/

ok i looked it up
http://www.hangar.org/wiki
/lab/doku.php?id=start:puredata_opencv#download_install
its available for mac and linux

Jean Yves Gratius made a first attempt to implement OpenCV on Windows with his CVlib library.

http://s184785159.onlinehome.fr/drupal/?q=node/167

merci beaucoup, mrpropre!
i will try to figure out the download link and instructions with my lousy french.

Hi there !
is it possible that openCV library for windows xp works on w7 ?
i tried bud didn't succeed.
Did someone tried?