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i.ifft - Inverse Fast Fourier Transform (IFFT) for image processing.


imagery, transformation, Fast Fourier Transform


i.ifft --help
i.ifft real=name imaginary=name output=name [--overwrite] [--help] [--verbose]
[--quiet] [--ui]

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

real=name [required]
Name of input raster map (image fft, real part)

imaginary=name [required]
Name of input raster map (image fft, imaginary part

output=name [required]
Name for output raster map


i.ifft is an image processing program based on the algorithm given by Frigo et al. (1998),
that converts real and imaginary frequency space images (produced by i.fft) into a normal


The current mask is respected when reading the real and imaginary component files; thus,
creating a mask is a primary step for selecting the portion of the frequency space data to
be included in the inverse transform. The module wxGUI vector digitizer can be used to
create masks while viewing the real or imaginary component image. Alternatively r.circle
can be used to generate high-, low- and donut filters specifying the DC point as
circle/ring center. When i.ifft is executed, it (automatically) uses the same GRASS region
definition setting that was used during the original transformation done with i.fft.

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