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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!