cv.jit.mean Computes the mean value of each pixel over time. Computes the mean value of each pixel over time. Works a lot like the regular Max object "mean". In order to clear the matrix, you must send the "reset" message rather than "clear", as "clear" will not reset the internal frame counter to zero. Accepts any data type or planecount. Note, however, that due to rounding errors, char and long calculations are going to deviate downwards from the actual mean. If accuracy is an issue, or you plan to feed cv.jit.mean a large number of frames, convert to floating point beforehand.

from the library : cv.jit Format : External Environment : jitter / max / msp freeware Max 4.x http://www.iamas.ac.jp/~jovan02/cv/download.html