.sp
.LP
These routines are used to go to and from the Fourier Domain
and perform operations in the Fourier Domain.
.SH
SHORT DESCRIPTION OF ROUTINES
.IP "2D FFT -" 20
Compute the two-dimensional Forward/Inverse Fast Fourier Transform (FFT).
.IP "2D Hadamard -" 20
Compute the two-dimensional Forward/Inverse Fast Hadamard Transform (FHT).
.IP "2D Mag, Power, Phase-" 20
Compute 2D magnitude, power, or phase spectrum information. (formerly vspectra)
