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/* filter/gsl_filter.h
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*
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* Copyright (C) 2018 Patrick Alken
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __GSL_FILTER_H__
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#define __GSL_FILTER_H__
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#include <gsl/gsl_math.h>
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#include <gsl/gsl_vector.h>
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#include <gsl/gsl_movstat.h>
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#undef __BEGIN_DECLS
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#undef __END_DECLS
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#ifdef __cplusplus
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# define __BEGIN_DECLS extern "C" {
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# define __END_DECLS }
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#else
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# define __BEGIN_DECLS /* empty */
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# define __END_DECLS /* empty */
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#endif
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__BEGIN_DECLS
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/* end point handling methods */
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typedef enum
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{
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GSL_FILTER_END_PADZERO = GSL_MOVSTAT_END_PADZERO,
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GSL_FILTER_END_PADVALUE = GSL_MOVSTAT_END_PADVALUE,
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GSL_FILTER_END_TRUNCATE = GSL_MOVSTAT_END_TRUNCATE
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} gsl_filter_end_t;
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/* robust scale estimates */
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typedef enum
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{
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GSL_FILTER_SCALE_MAD, /* median absolute deviation */
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GSL_FILTER_SCALE_IQR, /* interquartile range */
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GSL_FILTER_SCALE_SN, /* S_n scale statistic */
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GSL_FILTER_SCALE_QN /* Q_n scale statistic */
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} gsl_filter_scale_t;
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/* workspace for Gaussian filter */
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typedef struct
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{
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size_t K; /* window size */
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double *kernel; /* Gaussian kernel, size K */
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gsl_movstat_workspace *movstat_workspace_p;
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} gsl_filter_gaussian_workspace;
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gsl_filter_gaussian_workspace *gsl_filter_gaussian_alloc(const size_t K);
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void gsl_filter_gaussian_free(gsl_filter_gaussian_workspace * w);
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int gsl_filter_gaussian(const gsl_filter_end_t endtype, const double alpha, const size_t order, const gsl_vector * x,
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gsl_vector * y, gsl_filter_gaussian_workspace * w);
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int gsl_filter_gaussian_kernel(const double alpha, const size_t order, const int normalize, gsl_vector * kernel);
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/* workspace for standard median filter */
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typedef struct
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{
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gsl_movstat_workspace *movstat_workspace_p;
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} gsl_filter_median_workspace;
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gsl_filter_median_workspace *gsl_filter_median_alloc(const size_t K);
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void gsl_filter_median_free(gsl_filter_median_workspace * w);
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int gsl_filter_median(const gsl_filter_end_t endtype, const gsl_vector * x, gsl_vector * y, gsl_filter_median_workspace * w);
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/* workspace for recursive median filter */
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typedef struct
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{
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size_t H; /* window half-length (K / 2) */
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size_t K; /* window size */
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void *state; /* workspace for min/max accumulator */
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double *window; /* array holding first window */
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const gsl_movstat_accum * minmaxacc; /* minimum/maximum accumulator */
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gsl_movstat_workspace *movstat_workspace_p;
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} gsl_filter_rmedian_workspace;
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gsl_filter_rmedian_workspace *gsl_filter_rmedian_alloc(const size_t K);
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void gsl_filter_rmedian_free(gsl_filter_rmedian_workspace * w);
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int gsl_filter_rmedian(const gsl_filter_end_t, const gsl_vector * x, gsl_vector * y, gsl_filter_rmedian_workspace * w);
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int gsl_filter_rmedian2(const gsl_vector * x, gsl_vector * y, gsl_filter_rmedian_workspace * w);
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typedef struct
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{
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gsl_movstat_workspace *movstat_workspace_p;
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} gsl_filter_impulse_workspace;
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gsl_filter_impulse_workspace *gsl_filter_impulse_alloc(const size_t K);
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void gsl_filter_impulse_free(gsl_filter_impulse_workspace * w);
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int gsl_filter_impulse(const gsl_filter_end_t endtype, const gsl_filter_scale_t scale_type, const double t,
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const gsl_vector * x, gsl_vector * y, gsl_vector * xmedian, gsl_vector * xsigma, size_t * noutlier,
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gsl_vector_int * ioutlier, gsl_filter_impulse_workspace * w);
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__END_DECLS
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#endif /* __GSL_FILTER_H__ */
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