1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* 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 "image.h"
ImageFeatureList *itrans_peaksearch_threshold(ImageRecord *imagerecord, ControlContext *ctx) {
int width, height;
int x, y;
uint16_t *image = imagerecord->image;
uint16_t max = 0;
ImageFeatureList *flist;
flist = image_feature_list_new();
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);
image_add_feature(flist, x, y, imagerecord, image[x + width*y]);
}
}
}
return flist;
}
ImageFeatureList *itrans_peaksearch_adaptive_threshold(ImageRecord *imagerecord, ControlContext *ctx) {
uint16_t max_val = 0;
int width, height;
uint16_t *image;
uint16_t max;
int x, y;
ImageFeatureList *flist;
flist = image_feature_list_new();
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);
image_add_feature(flist, x, y, imagerecord, image[x + width*y]);
/* 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 flist;
}
|
