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/*
* image.c
*
* Handle images and image features
*
* (c) 2006-2010 Thomas White <taw@physics.org>
*
* Part of CrystFEL - crystallography with a FEL
*
*/
#define _ISOC99_SOURCE
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include "image.h"
#include "utils.h"
/**
* SECTION:image
* @short_description: Data structure representing an image
* @title: Image
* @section_id:
* @see_also:
* @include: "image.h"
* @Image:
*
* The <structname>image</structname> structure represents an image, usually one
* frame from a large series of diffraction patterns, which might be from the
* same or different crystals.
*/
struct _imagefeaturelist
{
struct imagefeature *features;
int n_features;
};
void image_add_feature(ImageFeatureList *flist, double fs, double ss,
struct image *parent, double intensity, const char *name)
{
if ( flist->features ) {
flist->features = realloc(flist->features,
(flist->n_features+1)
*sizeof(struct imagefeature));
} else {
assert(flist->n_features == 0);
flist->features = malloc(sizeof(struct imagefeature));
}
flist->features[flist->n_features].fs = fs;
flist->features[flist->n_features].ss = ss;
flist->features[flist->n_features].intensity = intensity;
flist->features[flist->n_features].parent = parent;
flist->features[flist->n_features].name = name;
flist->features[flist->n_features].valid = 1;
flist->n_features++;
}
ImageFeatureList *image_feature_list_new()
{
ImageFeatureList *flist;
flist = malloc(sizeof(ImageFeatureList));
flist->n_features = 0;
flist->features = NULL;
return flist;
}
void image_feature_list_free(ImageFeatureList *flist)
{
if ( !flist ) return;
if ( flist->features ) free(flist->features);
free(flist);
}
struct imagefeature *image_feature_closest(ImageFeatureList *flist,
double fs, double ss,
double *d, int *idx)
{
int i;
double dmin = +HUGE_VAL;
int closest = 0;
for ( i=0; i<flist->n_features; i++ ) {
double ds;
ds = distance(flist->features[i].fs, flist->features[i].ss,
fs, ss);
if ( ds < dmin ) {
dmin = ds;
closest = i;
}
}
if ( dmin < +HUGE_VAL ) {
*d = dmin;
*idx = closest;
return &flist->features[closest];
}
*d = +INFINITY;
return NULL;
}
int image_feature_count(ImageFeatureList *flist)
{
if ( flist == NULL ) return 0;
return flist->n_features;
}
struct imagefeature *image_get_feature(ImageFeatureList *flist, int idx)
{
/* Sanity check */
if ( flist == NULL ) return NULL;
if ( idx > flist->n_features ) return NULL;
if ( flist->features[idx].valid == 0 ) return NULL;
return &flist->features[idx];
}
void image_remove_feature(ImageFeatureList *flist, int idx)
{
flist->features[idx].valid = 0;
}
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