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Diffstat (limited to 'gsl-1.9/wavelet/haar.c')
-rw-r--r-- | gsl-1.9/wavelet/haar.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/gsl-1.9/wavelet/haar.c b/gsl-1.9/wavelet/haar.c new file mode 100644 index 0000000..8591cfd --- /dev/null +++ b/gsl-1.9/wavelet/haar.c @@ -0,0 +1,81 @@ +/* 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; |