[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.
Alain
>
> 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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