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/* wavelet/haar.c
*
* Copyright (C) 2004 Ivo Alxneit
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_wavelet.h>
static const double ch_2[2] = { M_SQRT1_2, M_SQRT1_2 };
static const double cg_2[2] = { M_SQRT1_2, -(M_SQRT1_2) };
static int
haar_init (const double **h1, const double **g1, const double **h2,
const double **g2, size_t * nc, size_t * offset,
const size_t member)
{
if (member != 2)
{
return GSL_FAILURE;
}
*h1 = ch_2;
*g1 = cg_2;
*h2 = ch_2;
*g2 = cg_2;
*nc = 2;
*offset = 0;
return GSL_SUCCESS;
}
static int
haar_centered_init (const double **h1, const double **g1, const double **h2,
const double **g2, size_t * nc, size_t * offset,
const size_t member)
{
if (member != 2)
{
return GSL_FAILURE;
}
*h1 = ch_2;
*g1 = cg_2;
*h2 = ch_2;
*g2 = cg_2;
*nc = 2;
*offset = 1;
return GSL_SUCCESS;
}
static const gsl_wavelet_type haar_type = {
"haar",
&haar_init
};
static const gsl_wavelet_type haar_centered_type = {
"haar-centered",
&haar_centered_init
};
const gsl_wavelet_type *gsl_wavelet_haar = &haar_type;
const gsl_wavelet_type *gsl_wavelet_haar_centered = &haar_centered_type;
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