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/*
* This file is part of the HDRL
* Copyright (C) 2017 European Southern Observatory
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/*-----------------------------------------------------------------------------
Includes
-----------------------------------------------------------------------------*/
#include "hdrl_spectrum_shift.h"
#include <math.h>
#include <cpl.h>
/*----------------------------------------------------------------------------*/
/**
* @defgroup hdrl_spectrum1d_shift test, the xcorrelation methods are already
* covered by the correlation tests.
*/
/*----------------------------------------------------------------------------*/
double calc_gauss(double mean, double sigma, double x){
double exponent = - pow((x- mean), 2.0) / (2.0 * sigma * sigma);
double v = 1.0/(2.0 * CPL_MATH_PI * sigma * sigma) * exp(exponent);
return v;
}
hdrl_value gauss_func(hdrl_data_t lambda){
hdrl_data_t mean = 1500;
hdrl_data_t sigma = 250;
double v = calc_gauss(mean, sigma, lambda);
return (hdrl_value){v, 0.0};
}
hdrl_value absorption1_func(hdrl_data_t lambda){
hdrl_data_t mean = 1754;
hdrl_data_t sigma = .75;
double v = calc_gauss(mean, sigma, lambda);
return (hdrl_value){ exp(-v), 0.0};
}
hdrl_value absorption2_func(hdrl_data_t lambda){
hdrl_data_t mean = 1504;
hdrl_data_t sigma = .75;
double v = calc_gauss(mean, sigma, lambda);
return (hdrl_value){ exp(-v), 0.0};
}
cpl_array * get_wlengths(double start, double stop, double step){
cpl_size sz = (cpl_size)floor((stop - start) / step);
cpl_array * arr = cpl_array_new(sz, HDRL_TYPE_DATA);
for(cpl_size i = 0; i < sz; i++){
cpl_array_set(arr, i, start);
start += step;
}
return arr;
}
void test_on_slope(void){
cpl_array * wlenghts = get_wlengths(1e3, 2e3, 1.0);
hdrl_spectrum1D * gaussian =
hdrl_spectrum1D_create_analytic(gauss_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
hdrl_spectrum1D * absorption =
hdrl_spectrum1D_create_analytic(absorption1_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
hdrl_spectrum1D * gaussian_with_abs =
hdrl_spectrum1D_mul_spectrum_create(gaussian, absorption);
hdrl_parameter * par =
hdrl_spectrum1D_shift_fit_parameter_create(1750, 1730, 1770, 1740, 1760, 20);
hdrl_data_t offset = hdrl_spectrum1D_compute_shift_fit(gaussian_with_abs, par);
cpl_test_rel((1.0 + offset) * 1750., 1754., 1e-3);
hdrl_spectrum1D_delete(&gaussian);
hdrl_spectrum1D_delete(&absorption);
hdrl_spectrum1D_delete(&gaussian_with_abs);
cpl_array_delete(wlenghts);
hdrl_parameter_delete(par);
}
void test_on_peak(void){
cpl_array * wlenghts = get_wlengths(1e3, 2e3, 1.0);
hdrl_spectrum1D * gaussian =
hdrl_spectrum1D_create_analytic(gauss_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
hdrl_spectrum1D * absorption =
hdrl_spectrum1D_create_analytic(absorption2_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
hdrl_spectrum1D * gaussian_with_abs =
hdrl_spectrum1D_mul_spectrum_create(gaussian, absorption);
hdrl_parameter * par =
hdrl_spectrum1D_shift_fit_parameter_create(1500, 1480, 1520, 1490, 1510, 20);
hdrl_data_t offset = hdrl_spectrum1D_compute_shift_fit(gaussian_with_abs, par);
cpl_test_rel((1.0 + offset) * 1500., 1504., 1e-3);
hdrl_spectrum1D_delete(&gaussian);
hdrl_spectrum1D_delete(&absorption);
hdrl_spectrum1D_delete(&gaussian_with_abs);
cpl_array_delete(wlenghts);
hdrl_parameter_delete(par);
}
void test_compute_shift_xcorrelation(void)
{
cpl_array * wlenghts = get_wlengths(1e3, 2e3, 1.0);
hdrl_spectrum1D * gaussian = hdrl_spectrum1D_create_analytic(
gauss_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
hdrl_spectrum1D * absorption = hdrl_spectrum1D_create_analytic(
absorption2_func, wlenghts, hdrl_spectrum1D_wave_scale_linear);
cpl_size half_win = 1;
/* Test nulls */
hdrl_spectrum1D_compute_shift_xcorrelation(
NULL, NULL, half_win, CPL_FALSE);
cpl_test_error(CPL_ERROR_NULL_INPUT);
hdrl_spectrum1D_compute_shift_xcorrelation(
NULL, absorption, half_win, CPL_FALSE);
cpl_test_error(CPL_ERROR_NULL_INPUT);
hdrl_spectrum1D_compute_shift_xcorrelation(
gaussian, NULL, half_win, CPL_FALSE);
cpl_test_error(CPL_ERROR_NULL_INPUT);
hdrl_spectrum1D_compute_shift_xcorrelation(
gaussian, absorption, half_win, CPL_FALSE);
cpl_test_error(CPL_ERROR_ILLEGAL_INPUT);
hdrl_spectrum1D_delete(&gaussian);
hdrl_spectrum1D_delete(&absorption);
cpl_array_delete(wlenghts);
}
/*----------------------------------------------------------------------------*/
/**
@brief Unit tests of spectrum shift estimation module
**/
/*----------------------------------------------------------------------------*/
int main(void)
{
cpl_test_init(PACKAGE_BUGREPORT, CPL_MSG_WARNING);
test_on_slope();
test_on_peak();
test_compute_shift_xcorrelation();
return cpl_test_end(0);
}
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