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
119
120
121
122
|
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
enum BUTTON {LEFT};
enum KEYS {SPACE};
bool mButton[1] = { false };
bool key[1] = { false };
void CallBackFunc(int event, int x, int y, int flags, void* userdata);
void thresholdArea(Point, Mat &);
void explore(int, int, int, Mat &, vector<bool> &, Vec3b);
int main(int argc, char **argv) {
//Create matrix to store image
Mat image;
Point mPos, target;
int key = 0;
//initialize capture
VideoCapture cap;
//access primary camera
//cap.open(0);
//Create window to show
namedWindow("window", 1);
//load test image
image = imread("lena.bmp", IMREAD_COLOR);
do {
//copy webcam stream to image
//cap >> image;
//print image to screen
imshow("window", image);
//get mouse events
setMouseCallback("window", CallBackFunc, &mPos);
if (mButton[LEFT]) {
mButton[LEFT] = false;
target.x = mPos.x;
target.y = mPos.y;
thresholdArea(target, image);
int x = 0;
}
//reload test image if 'enter' key pressed
if (key == 13) {
image = imread("lena.bmp", IMREAD_COLOR);
}
key = waitKey(16);
} while (key != 27); //press escape to exit
destroyAllWindows();
return 0;
}
void CallBackFunc(int event, int x, int y, int flags, void* userdata) {
Point *p = (Point*)userdata;
p->x = x;
p->y = y;
if (event == EVENT_LBUTTONDOWN) {
mButton[LEFT] = true;
}
}
void thresholdArea(Point target, Mat &image) {
Vec3b color;
Vec3b pPix = image.ptr <Vec3b>(target.y)[target.x];
vector<bool> isSeen(image.cols * image.rows, false);
//color of pixel at mouse click (as 24-bit number)
int center = pPix[0] << 16 | pPix[1] << 8 | pPix[2] << 0;
//new color of region
color[0] = 255;
color[1] = 0;
color[2] = 255;
explore(center, target.x, target.y, image, isSeen, color);
int i = 0;
}
void explore(int center, int x, int y, Mat &image, vector<bool> &isSeen, Vec3b color) {
Vec3b pPix = image.ptr <Vec3b>(y)[x];
//color of current pixel (as 24-bit number)
int pColor = pPix[0] << 16 | pPix[1] << 8 | pPix[2] << 0;
//exit if out of bounds
if (x < 0 || x >= image.cols || y < 0 || y >= image.rows)
return;
if (isSeen[y * image.cols + x])
return;
//flag pixel as seen
isSeen.at(y * image.cols + x) = true;
//if current pixel color is within + or -10% of center pixel
if (pColor > center - 0xffffff * .1 && pColor < center + 0xffffff * .1) {
image.ptr <Vec3b>(y)[x] = color;
}
else
return;
//explore 8-neighbors
explore(center, x + 1, y, image, isSeen, color);
explore(center, x - 1, y, image, isSeen, color);
explore(center, x, y + 1, image, isSeen, color);
explore(center, x, y - 1, image, isSeen, color);
explore(center, x - 1, y + 1, image, isSeen, color);
explore(center, x - 1, y - 1, image, isSeen, color);
explore(center, x + 1, y - 1, image, isSeen, color);
explore(center, x + 1, y + 1, image, isSeen, color);
}
|
