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// Shinohara Intensity Ratio
//
// shinohara_intensity_ratio
//
// Shinohara Intensity Ratio
//
//
//
// Inputs: 4
// Outputs: 1
// Constants: 1
#include <stdlib.h>
#include <math.h>
#include "ts.h"
typedef struct {
uint_t k;
} ts_shinohara_intensity_ratio_params_t;
ts_parameter_t const ts_shinohara_intensity_ratio_p = { .n_inputs = 4, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_shinohara_intensity_ratio_params_t) };
uint_t ts_shinohara_intensity_ratio_offset( ts_constant_t const *c )
{
( void )c;
return ( c ? ((ts_shinohara_intensity_ratio_params_t const *)c)->k > 0 ? ((ts_shinohara_intensity_ratio_params_t const *)c)->k - 1 : 0 : 0 );
}
int ts_shinohara_intensity_ratio(
fp_t * const *y, uint_t y_n,
fp_t const * const *x, uint_t x_n,
uint_t n, ts_constant_t const *c
)
{
TS_PROLOGUE( ts_shinohara_intensity_ratio_p );
if ( !c ) return -1;
uint_t k = ((ts_shinohara_intensity_ratio_params_t const *)c)->k;
if (k == 0 || n < k) return -1;
fp_t *intensity = calloc( n, sizeof( fp_t ) );
if ( !intensity ) return -1;
for( uint_t i = 0; i < n; ++i )
{
fp_t h = ts_h(x, i);
fp_t l = ts_l(x, i);
fp_t cl = ts_c(x, i);
fp_t o = ts_o(x, i);
fp_t range = h - l;
if( range == 0 )
{
intensity[i] = 0;
}
else if( cl > o )
{
intensity[i] = (h - cl) / range;
}
else
{
intensity[i] = (cl - l) / range;
}
}
for (uint_t j = 0; j < n && j < k - 1; ++j) y[0][j] = 0;
for( uint_t i = k - 1; i < n; ++i )
{
if( i == k - 1 )
{
fp_t sum = 0;
for( uint_t j = 0; j < k; ++j )
sum += intensity[j];
y[0][i] = sum / k;
}
else
{
y[0][i] = y[0][i-1] + (intensity[i] - intensity[i - k]) / k;
}
}
free( intensity );
return 0;
}
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