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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