.INPUT FILE: VOL001
[Enter the name of the input file.]
.OUTPUT FILE: VOL002
[Enter name for output file.]
.NEIGHBORHOOD X, Y, & Z: 3 3 3
[Length of the neighborhood around a pixel. Must be an
Image/volume is "circularly closed" so that pixels on
boundaries have a neighbor on opposite boundary.
Variance is (1/N-1) * summation (over the neighborhood) of
the square of the difference between the pixel's intensity
and the average intensity of pixels in the neighborhood.
(Where N is the number of pixels in the the neighborhood.)