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HT2FT
Section: C Library Functions (3)
Updated: 16 Mar 1998
Index
NAME
ht2ft - 2d hartley to fourier conversion
SYNTAX
#include <
xite/fht.h>
int ht2ft( IR_BAND inband, IC_BAND outband );
DESCRIPTION
ht2ftconverts a Hartley transform to a Fourier transform.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)
RESTRICTIONS
bands should have equal size, be quadratic, and havesize some power of two. Currently, only single precisionfloat values are accepted.
SEE ALSO
ht2ft(1),
fft2d(3),
fht2d(3),
ft2ht(3)
RETURN VALUE
0 => ok
1 => bad pixel type input
2 => bad pixel type output
3 => bad sizes
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
ID
$Id: ht2ft.c,v 1.26 1997/05/27 14:48:35 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- RESTRICTIONS
- SEE ALSO
- RETURN VALUE
- AUTHOR
- ID
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