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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 <assert.h>
#include "control.h"
#include "imagedisplay.h"
#include "reflections.h"
unsigned int itrans_peaksearch_threshold(ImageRecord imagerecord, ControlContext *ctx) {
int width, height;
int x, y;
unsigned int n_reflections = 0;
uint16_t *image = imagerecord.image;
double tilt_degrees = imagerecord.tilt;
uint16_t max = 0;
width = imagerecord.width;
height = imagerecord.height;
/* Simple Thresholding */
for ( y=0; y<height; y++ ) {
for ( x=0; x<width; x++ ) {
if ( image[x + width*y] > max ) max = image[x + width*y];
}
}
for ( y=0; y<height; y++ ) {
for ( x=0; x<width; x++ ) {
if ( image[x + width*y] > max/3 ) {
assert(x<width);
assert(y<height);
assert(x>=0);
assert(y>=0);
if ( imagerecord.fmode == FORMULATION_PIXELSIZE ) {
reflection_add_from_reciprocal(ctx,
(signed)(x-imagerecord.x_centre)*imagerecord.pixel_size,
(signed)(y-imagerecord.y_centre)*imagerecord.pixel_size,
tilt_degrees, image[x + width*y]);
} else {
reflection_add_from_dp(ctx,
(signed)(x-imagerecord.x_centre)/imagerecord.resolution,
(signed)(y-imagerecord.y_centre)/imagerecord.resolution,
tilt_degrees, image[x + width*y]);
}
n_reflections++;
}
}
}
return n_reflections;
}
unsigned int itrans_peaksearch_adaptive_threshold(ImageRecord imagerecord, ControlContext *ctx) {
uint16_t max_val = 0;
int width, height;
unsigned int n_reflections = 0;
uint16_t *image;
double tilt_degrees = imagerecord.tilt;
uint16_t max;
int x, y;
image = imagerecord.image;
width = imagerecord.width;
height = imagerecord.height;
max = 0;
for ( y=0; y<height; y++ ) {
for ( x=0; x<width; x++ ) {
if ( image[x + width*y] > max ) max = image[x + width*y];
}
}
/* Adaptive Thresholding */
do {
int max_x = 0;
int max_y = 0;;
/* 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 > max/10 ) {
assert(max_x<width);
assert(max_y<height);
assert(max_x>=0);
assert(max_y>=0);
if ( imagerecord.fmode == FORMULATION_PIXELSIZE ) {
reflection_add_from_reciprocal(ctx,
(signed)(max_x-imagerecord.x_centre)*imagerecord.pixel_size,
(signed)(max_y-imagerecord.y_centre)*imagerecord.pixel_size,
tilt_degrees, image[max_x + width*max_y]);
} else {
reflection_add_from_dp(ctx, (signed)(max_x-imagerecord.x_centre)/imagerecord.resolution,
(signed)(max_y-imagerecord.y_centre)/imagerecord.resolution,
tilt_degrees, image[max_x + width*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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