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/*
* itrans-threshold.c
*
* Threshold and adaptive threshold peak searches
*
* (c) 2007 Thomas White <taw27@cam.ac.uk>
*
* dtr - Diffraction Tomography Reconstruction
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdint.h>
#include "control.h"
#include "imagedisplay.h"
#include "reflections.h"
unsigned int itrans_peaksearch_threshold(int16_t *image, ControlContext *ctx, double tilt_degrees, ImageDisplay *imagedisplay) {
int width, height;
int x, y;
unsigned int n_reflections = 0;
width = ctx->width; height = ctx->height;
/* Simple Thresholding */
for ( y=0; y<height; y++ ) {
for ( x=0; x<width; x++ ) {
if ( image[x + width*y] > 10 ) {
if ( ctx->fmode == FORMULATION_PIXELSIZE ) {
reflection_add_from_reciprocal(ctx, (signed)(x-ctx->x_centre)*ctx->pixel_size, (signed)(y-ctx->y_centre)*ctx->pixel_size,
tilt_degrees, image[x + width*y]);
} else {
reflection_add_from_dp(ctx, (signed)(x-ctx->x_centre), (signed)(y-ctx->y_centre), tilt_degrees, image[x + width*y]);
}
if ( ctx->first_image ) {
imagedisplay_mark_point(imagedisplay, x, y);
}
n_reflections++;
}
}
}
return n_reflections;
}
unsigned int itrans_peaksearch_adaptive_threshold(int16_t *image, ControlContext *ctx, double tilt_degrees, ImageDisplay *imagedisplay) {
int16_t max_val = 0;
int width, height;
unsigned int n_reflections = 0;
width = ctx->width; height = ctx->height;
/* Adaptive Thresholding */
do {
int max_x = 0;
int max_y = 0;;
int x, y;
/* Locate the highest point */
max_val = 0;
for ( y=0; y<height; y++ ) {
for ( x=0; x<width; x++ ) {
if ( image[x + width*y] > max_val ) {
max_val = image[x + width*y];
max_x = x; max_y = y;
}
}
}
if ( max_val > 50 ) {
if ( ctx->fmode == FORMULATION_PIXELSIZE ) {
reflection_add_from_reciprocal(ctx, (signed)(max_x-ctx->x_centre)*ctx->pixel_size, (signed)(max_y-ctx->y_centre)*ctx->pixel_size,
tilt_degrees, max_val);
} else {
reflection_add_from_dp(ctx, (signed)(max_x-ctx->x_centre), (signed)(max_y-ctx->y_centre), tilt_degrees, max_val);
}
if ( ctx->first_image ) {
imagedisplay_mark_point(imagedisplay, max_x, max_y);
}
n_reflections++;
/* Remove it and its surroundings */
for ( y=((max_y-10>0)?max_y-10:0); y<((max_y+10)<height?max_y+10:height); y++ ) {
for ( x=((max_x-10>0)?max_x-10:0); x<((max_x+10)<width?max_x+10:width); x++ ) {
image[x + width*y] = 0;
}
}
}
} while ( max_val > 50 );
return n_reflections;
}
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