.sp
.LP
These routines operate on images which are in the frequency domain.
.SH
SHORT DESCRIPTION OF ROUTINES
.IP "Low-Pass Filter -" 20
Perform low-pass filtering on an image in the frequency domain.
.IP "High-Pass Filter -" 20
Perform high-pass filtering on an image in the frequency domain.
.IP "Band-Pass Filter -" 20
Perform band-pass filtering on an image in the frequency domain.
.IP "Band-Reject Filter -" 20
Perform band-reject filtering on an image in the frequency domain.
.IP "Inverse Filter -" 20
Perform image restoration by inverse filtering in the frequency domain.
.IP "Wiener Restoration -" 20
Perform image restoration by Wiener (least-squares) filtering.
.IP "Space-varying Restoration -" 20
Perform image restoration of space-varying point spread functions.
.IP "Bandlimited extrapolation -" 20
Perform bandlimited extrapolation or adaptive apodization
