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feature_compute_descriptors.c
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feature_compute_descriptors.c
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#include "header.h"
#include "proto.h"
void feature_compute_descriptors(
int octave_nbr,
int interval_nbr,
double ***gauss_pyr_image,
int *gauss_pyr_width,
int *gauss_pyr_height,
double ***dog_pyr_image,
feat_struct *feat_arr,
int feat_nbr
)
{
int feat_ind;
feat_struct feat;
int octave;
int interval;
int i;
int j;
double xinterval;
double xi;
double xj;
double sigma;
double sigma_octave;
double ori;
int width;
int height;
double *image;
int descr_width;
int hist_nbr;
double ***hist_arr;
int hist_i;
int hist_j;
for ( feat_ind= 0 ; feat_ind< feat_nbr ; feat_ind++ ) {
feat= feat_arr[feat_ind];
octave= feat.octave;
interval= feat.interval;
i= feat.i;
j= feat.j;
xinterval= feat.xinterval;
xi= feat.xi;
xj= feat.xj;
sigma= feat.sigma;
sigma_octave= feat.sigma_octave;
ori= feat.ori;
width= gauss_pyr_width[octave];
height= gauss_pyr_height[octave];
image= gauss_pyr_image[octave][interval];
descr_width= 4;
hist_nbr= 8;
hist_arr= feature_descriptor_histogram(
width,
height,
image,
i,
j,
ori,
sigma_octave,
descr_width,
hist_nbr
);
/*
Convert descr_width*descr_width descriptor array of histograms
into a vector stored directly inside the feature
*/
feature_descriptor_convert_histogram(
hist_arr,
descr_width,
hist_nbr,
&feat_arr[feat_ind]
);
/*
Free hist_arr
*/
for ( hist_i= 0 ; hist_i< descr_width ; hist_i++ ) {
for ( hist_j= 0 ; hist_j< descr_width ; hist_j++ ) {
free(hist_arr[hist_i][hist_j]);
}
free(hist_arr[hist_i]);
}
free(hist_arr);
} /* loop on the features */
}