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HT2FT
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
ht2ft - 2d hartley to fourier conversion
SYNTAX
ht2ft [-t <title>] <inimage> <outimage>
DESCRIPTION
ht2fttransforms a (single precision) real Hartleytransform to a (single precision) complex Fouriertransform. Note that the Hartley transform is fasterthan Fourier. If you need Fourier it may be fasterto compute the Hartley transform and then convert toFourier by means of ht2ft.
The Fourier transform is given by the Hartley transformas follows:
F(u,v) = Re{F(u,v)} + j Im{F(u,v)}
= H_e(u,v) - j H_o(u,v)
= (H(u,v) + H(-u,-v))/2 - j (H(u,v) - H(-u,-v))/2
For images with horizontal and vertical even symmetryH_o(u,v) equals zero, so that
F(u,v) = H_e(u,v) = H(u,v)
SEE ALSO
ht2ft(3),
fft2d(1),
fht2d(1),
ft2ht(1)
RESTRICTIONS
Input must be a single precision hartley transform
RETURN VALUE
0 => ok
1 => bad number of arguments
2 => couldn't read input file
3 => couldn't write output file
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
EXAMPLES
ht2ft monah.img monaf.img
ID
$Id: ht2ft.c,v 1.26 1997/05/27 14:48:35 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- SEE ALSO
- RESTRICTIONS
- RETURN VALUE
- AUTHOR
- EXAMPLES
- ID
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