[jitter] Automatic multi-object tracking ?

Dear Max/MSP/Jitter community  (first post here so I am polite :) )

I'd like to share a few theorical problems I have on implementing a multi-object tracking with jitter. I'm quite new with Max/MSP but I have worked a lot with eyesweb. So please excuse me if I missed some really easy objects or patch I could use.

So the idea is multi-object tracking, and not color tracking. So far, I found the jit.track that can follow many objects. The main issue here is to provide the coordinates of the moving objects. From what I saw, it is mainly manually done by clicking with the mouse but this solution doesn't satisfy me.
In my patch, the objects could be extracted from the video with a simple frame difference and I would obtain a 1/0 matrix (or black and white image) with blobs of white pixels, 1 for each object. So my first question is here, what can I use to automatically find the coordinates (whatever it is, first pixel, or centroid) and area of several detected objects on screen? 

Second, I found few trackers on jitter besides a linear Kalman, are there some other librairies available with different trackers ? In my patch, it is really important that different objects don't mix with each other if their detected blobs collapse for a few frames on screen...

Thanks for reading (and maybe thinking ;)) about my questions !
I believe people who will read this post are interested in tracking objects. I'd love to see your works so don't hesitate to make some advertisment.

Bonne soirée (good evening in french)