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HAAR
Section: C Library Functions (3)
Updated: 16 Mar 1998
Index
NAME
haar, haar1d, haari1d, haar2d, haari2d - 1D and 2Dforward and inverse Haar Transform
SYNTAX
#include <
xite/haar.h>
int haar1d( float* a1, float* a2, int size );
int haari1d( float* a1, float* a2, int size );
int haar2d( IR_BAND b1, IR_BAND b2 );
int haari2d( IR_BAND b1, IR_BAND b2 );
DESCRIPTION
`haar1d` - 1D forward Haar Transform (HT).
`haari1d` - 1D inverse HT
`haar2d` - 2D forward HT
`haari2d` - 2D inverse HT
a1 : input vector
a2 : output vector
size : size of a1 and a2.
b1 : input band
b2 : output band
Identical actual arguments are allowed for b1 and b2.
REFERENCES
N. Ahmed and K.R. Rao, Orthogonal Transforms forDigital Signal Processing, p. 263, Springer-Verlag, 1975.
H.C. Andrews and K.L. Caspari, "A generalizedtechnique for spectral analysis", IEEE Trans., Comput.,Vol. C-19, pp. 16-25, 1970.
N. Ahmed, T. Natarajan and K.R. Rao, "Cooley-Tukeytype algorithm for the Haar transform", Electronics Letters,Vol. 9, pp. 276-278, 1973.
RESTRICTIONS
Vectors a1 and a2 should have size some power of two.Bands b1 and b2 should have overlapping size some powerof two. Both bands should have pixel type Ireal_typ.
RETURN VALUE
haar1d and haari1d:
0 => ok
1 => negative size
2 => size not power of 2
haar2d and haari2d:
0 => ok
1 => bad pixel type band 1
2 => bad pixel type band 2
3 => bad size (not power of two)
SEE ALSO
fft2d(3),
fft2d(1),
fht2d(3),
fht2d(1),
haarTexture(3),
haarTexture(1)
AUTHOR
Tor Lønnestad, BLAB, ifi, UiO
ID
$Id: haar.c,v 1.12 1995/11/06 15:07:14 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- REFERENCES
- RESTRICTIONS
- RETURN VALUE
- SEE ALSO
- AUTHOR
- ID
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