cv.jit.trackgroup This object is used to manage the input and output of cv.jit.track. This object is used to manage the input and output of cv.jit.track. In order to improve on the robustness of a tracking method, it is useful to use a group of pixels, instead of just one, to track an object. That way, if a pixel gets lost or wanders off the object, the other pixels can continue tracking.	from the library : cv.jit Format : External Environment : jitter / max / msp freeware Max 4.x http://www.iamas.ac.jp/~jovan02/cv/download.html