Help for FFT2

PURPOSE

 FFT2 is a VICAR procedure that computes the forward and inverse complex 
 two-dimensional Fourier Transform.  It invokes program FFT22.

EXECUTION:

The following is the execution statement format for FFT2:

	FFT2 IN OUT SIZE PARAMS

where INP, OUT, SIZE, PARAMS are parameters discussed in their respective
parameter sections.
OPERATION:

The maximum image dimension (NL or NS) may not equal or exceed 4096; in
practice, this implies that the maximum dimension allowed for FFT22 is
4075.

See FFT22 for details of operation.  Details on the algorithm for the 
Fourier transform are given in HELP FFT22.

The output of the forward transform (and the input of the inverse)
is a two-dimensional Fourier-transform image in complex format.
Most Vicar programs do not support complex format, so if the user
wishes to do any processing on such an image with Vicar programs, 
one must generally first separate it into its REAL components using 
program CCOMP (q.v.),

WRITTEN BY:   L.W.Kamp  24 August 1985

COGNIZANT PROGRAMMER: L.W.Kamp

REV:          A. Scop   8 May 1995     (CRI) MSTP S/W CONVERSION
                                       Made portable for UNIX