NOISE_SMOOTH

        NOISE_SMOOTH

    Smoothes an  input  image   using   the   noise   cheating   enhancement
    method.   This  method  works only for strictly positive images.  Values
    for adjacent pixels are summed until a given total  is  reached.   Then,
    the  total  is  divided  by the number of pixels added and the result is
    used for the output pixel value.  This smoothing is very non linear  (in
    particular  no  smoothing  occur  on  pixels stronger than the smoothing
    threshold).  A parameter allows to  restrict  the  averaging  to  nearby
    pixels only :  in this case the output image is not necessarily strictly
    positive.