KPG1_FFTBR

Takes the inverse (Backward) FFT of a real image

Description:

The input array should hold a Fourier transform of a purely real image, in Hermitian format as produced by KPG1_FFTFR, or KPG1_HMLTR. The inverse FFT of this image is taken and returned in OUT.

Invocation

CALL KPG1_FFTBR( M, N, IN, WORK, OUT, STATUS )

Arguments

M = INTEGER (Given)
Number of columns in the input array.
N = INTEGER (Given)
Number of rows in the input array.
IN( M, N ) = REAL (Given)
The input array (a Fourier transform of a real image, stored in Hermitian format).
WORK( ∗ ) = REAL (Given)
Work space. This must be at least ( 3∗MAX( M, N ) + 15 ) elements long.
OUT( M, N ) = REAL (Returned)
The inverse FFT of the input array (a purely real image). Note, the same array can be specified for both input and output, in which case the supplied values are overwitten.
STATUS = INTEGER (Given and Returned)
The global status.