[PD] Opencv & pd

[nanodust]

> > 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!