[PD] Opencv & pd

nosehair911 at bellsouth.net nosehair911 at bellsouth.net
Wed May 30 15:17:22 CEST 2007

I dont know if you have ever used pix_multiblob before. This would be my first option and I already 
had built a huge project using pix_multiblob before I realized that just tracking 5 blobs with 
pix_multiblob on a G5 dual 2Ghz with a Radeon 9800 XT and 3 gig of ram it was using up 98-104 
percent of my cpu on just tracking lone.  Try the pix_multiblob example.  The opencv app I built 
running on a powerbook g4 1.5Ghz with 512mb of ram only uses 38-45 of my cpu with the same 
movie.  In my project I am going to need to track at least 15 to 20 blobs if not more. You do the math.  
The reason I want to build it into an external is for convenience and for the learning process.  If you 
have any help to give I will be happy to learn from you.
> From: "nanodust" <nanodust at gmail.com>
> Date: 2007/05/30 Wed AM 08:07:45 EDT
> To: <pd-list at iem.at>
> Subject: Re: [PD] Opencv & pd
> > > For the last 2 weeks I have been trying to write a motion tracking 
> > > external using the blob motion tracker in opencv.  I had success 
> > > with writing a program that recieves a path to an avi and motion 
> > > tracks the blobs and prints their position.  Now I am writing the
> IOhannes m zmoelnig wrote:
> > otoh, why don't you just use the Gem framework?
> My thoughts *EXACTLY*
> Why spend time re-doing what exists? (for fun, perhaps ;)
> As it is, pix_blob works quite well - and if you need multiblob, update
> pd/gem from CVS - pix_multiblob works very well also, and is quite fast.
> *instancing* / id tracking is rare (not inherent to openCV either), but I
> was able to hack it well enough for my purposes.
> > if nothing else works, it might be simplest to just write your own 
> > application (without pd) and send the data to pd via your favourite 
> > protocol (FUDI, OSC, SMTP...)
> Indeed - for more complicated operations (face &  body recognition) I used
> opencv's haars, then sent the coordinates to GEM via OSC for various visual
> effects.
> From pd context, I don't see what benefit opencv blobs have over
> pix_multi/blob; but perhaps I am missing something!
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