ok thanx everybody so far.

via the cv.jit plugin I figured out how to get the background substraction working (might not be to difficult for most of you... (well I got problems with my webcam and Jitter in general :) )

With the generated black/white picture I would like to manipulate a particle system as to let the particles "flow" over the masked forground area. But my knowledge in Javascript and Jitter are so limited I can't quite figure it out ...

Hope anybody could help me with the combination of foreground tracking and particle systems.

Please and thanx a lot Philipp