VFFT
Section: User Commands (1)
Updated: May 15, 1991
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NAME
vfft - virtual-very fast fourier transform
SYNOPSIS
vfft [-V] [-D2] [-double] [<] inputimage [> [-o]VFFT_file]
DESCRIPTION
VFFT (Virtual-Very Fast Fourier Transform) is specially designed to speed
image processing in frequency domain. It is in different format from regular
FFT (Fast Fourier transform). The VFFT is in 51% to 75% compressed format.
It takes less storage room, and runs 8 to 10 times faster than FFT version.
For VFFT to FFT conversion, use dcvtob program.
OPTIONS
- -D2
-
do a 2 dimensional Fourier transform. The default is 3-dimensional VFFT.
- -V
-
do very fast Fourier transform in separated planes (real & imaginary).
- -d
-
output double VFFT. The default is float VFFT.
NOTE
The input can be one of the following 6 type images:
HIPS, FITS, GIF, ICC, RLE, PNM, SUN-Raster, and TIFF
The output is a HIPS image.
Input can be any noncomplex format, double input can only output DVFFT.
SEE ALSO
vfftpass(1), vfftfilter(1), inv-vfft(1), dcvtob(1), tuner(1)
AUTHOR
Jin Guojun - 5/15/91
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- NOTE
-
- SEE ALSO
-
- AUTHOR
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