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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
| import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import java.io.File;
public class CircleDetection {
private static BufferedImage grey;
private static int[][] sobelX;
private static int[][] sobelY;
private static double[][] sobelTotal;
private static String path = System.getProperty("user.dir");
private static int maxX = 0;
private static int maxY = 0;
private static int maxR = 0;
private static int threshold = 300;
public static void main(String[] args) throws Exception{
//ensures all the file systems required are in order
File originalFile = new File("test5.png");
File originalDirectory = new File(path+"\\result");
if(!(originalDirectory.exists() && originalDirectory.isDirectory())){
try{
originalDirectory.mkdir();
}catch (Exception e){
e.printStackTrace();
}
}
//runs the required processes for circle detection, ie sobel edge detection
toGrayScale(originalFile);
edgeDetection();
//creates and outputs images for the sobel sweep in x and y direction, and the combined sobel output
BufferedImage img = new BufferedImage(grey.getWidth(), grey.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
for(int i = 0; i< grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight(); j++){
img.setRGB(i, j, sobelX[i][j]);
}
}
File outX = new File(path+"\\result\\sobelX.png");
ImageIO.write(img, "png", outX);
BufferedImage ing = new BufferedImage(grey.getWidth(), grey.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
for(int i = 0; i< grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight(); j++){
ing.setRGB(i, j, sobelY[i][j]);
}
}
File outY = new File(path+"\\result\\sobelY.png");
ImageIO.write(ing, "png", outY);
BufferedImage total = new BufferedImage(grey.getWidth(), grey.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
double max = 0;
for(int i = 0; i< grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight(); j++){
if(sobelTotal[i][j]>max){
max = sobelTotal[i][j];
}
}
}
for(int i = 0; i< grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight(); j++){
//maps every pixel to a grayscale value between 0 and 255 from between 0 and the max value in sobelTotal
int rgb = new Color((int)map(sobelTotal[i][j], 0,max,0,255),
(int)map(sobelTotal[i][j], 0,max,0,255),
(int)map(sobelTotal[i][j], 0,max,0,255), 255).getRGB();
total.setRGB(i,j,rgb);
}
}
total = changeBrightness(20.0f, total);
File out2 = new File(path+"\\result\\sobelTotal.png");
ImageIO.write(total, "png", out2);
//outputs an image showing every pixel that is above the threshold
BufferedImage totalColour = new BufferedImage(grey.getWidth(), grey.getHeight(), BufferedImage.TYPE_INT_ARGB);
for(int i = 0; i < grey.getWidth(); i++) {
for(int j = 0; j < grey.getHeight(); j++) {
Color c1 = new Color(0,255,0);
if(sobelTotal[i][j] > threshold) {
totalColour.setRGB(i, j, c1.getRGB());
}
}
}
File outThreshold = new File(path+"\\result\\totalGreen.png");
ImageIO.write(totalColour, "png", outThreshold);
//runs circle detection and outputs an image of the original with the circle detected superimposed in red
BufferedImage totalCircles = new BufferedImage(grey.getWidth(), grey.getHeight(), BufferedImage.TYPE_INT_ARGB);
circleDetection(total);
total = changeBrightness(0.5f, total);
totalCircles.getGraphics().drawImage(total, 0, 0, null);
Graphics2D g = totalCircles.createGraphics();
g.setColor(Color.RED);
double a = maxX - maxR * Math.cos(0 * Math.PI / 180);
double b = maxY - maxR * Math.sin(90 * Math.PI / 180);
g.drawOval((int)a,(int)b,2*maxR,2*maxR);
File outfinal = new File(path+"\\result\\totalCircles.png");
ImageIO.write(totalCircles, "png", outfinal);
}
//maps the given value between startCoord1 and endCoord1 to a value between startCoord2 and endCoord2
private static double map(double valueCoord1,
double startCoord1, double endCoord1,
double startCoord2, double endCoord2) {
double ratio = (endCoord2 - startCoord2) / (endCoord1 - startCoord1);
return ratio * (valueCoord1 - startCoord1) + startCoord2;
}
//converts given file into a grayscale image
private static void toGrayScale(File f) throws Exception{
BufferedImage img = ImageIO.read(f);
grey = new BufferedImage(img.getWidth(), img.getHeight(), img.TYPE_BYTE_GRAY);
grey.getGraphics().drawImage(img, 0 , 0, null);
}
//runs all the functions required to complete edge detection
private static void edgeDetection(){
calcSobelX();
calcSobelY();
combineSobel();
}
//performs the horizontal sobel sweep, sets up the matrix using a 3x3 array and runs through
//every pixel to calculate the sobel result
private static void calcSobelX(){
sobelX = new int[grey.getWidth()][grey.getHeight()];
int[][] base = new int[3][3];
base[0][0] = -1;
base[1][0] = -2;
base[2][0] = -1;
base[0][1] = 0;
base[1][1] = 0;
base[2][1] = 0;
base[0][2] = 1;
base[1][2] = 2;
base[2][2] = 1;
for(int i = 0; i<grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight();j++){
sobelX[i][j] = getSobelResult(i,j,base);
}
}
}
//performs the vertical sobel sweep, sets up the matrix using a 3x3 array and runs through
//every pixel to calculate the sobel result
private static void calcSobelY(){
sobelY = new int[grey.getWidth()][grey.getHeight()];
int[][] base = new int[3][3];
base[0][0] = -1;
base[0][1] = -2;
base[0][2] = -1;
base[1][0] = 0;
base[1][1] = 0;
base[1][2] = 0;
base[2][0] = 1;
base[2][1] = 2;
base[2][2] = 1;
for(int i = 0; i<grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight();j++){
sobelY[i][j] = getSobelResult(i,j,base);
}
}
}
//a series of if statements to account for any edge cases to ensure no errors, calculates
//the sobel result for any pixel and kernel
private static int getSobelResult(int x, int y, int[][] base){
int result = 0;
if(x==0 && y ==0){
for(int i = 0; i <= 1; i++){
for(int j = 0; j <= 1; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x==0 && y==grey.getHeight()-1){
for(int i = 0; i <= 1; i++){
for(int j = -1; j <= 0; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x==0 && y !=0){
for (int i = 0; i <= 1; i++) {
for (int j = -1; j <= 1; j++) {
result += new Color(grey.getRGB(x + i, y + j)).getRed()* base[j + 1][i + 1];
}
}
}else if(x==grey.getWidth()-1 && y ==0){
for(int i = -1; i <= 0; i++){
for(int j = 0; j <= 1; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x!=0 && y ==0){
for(int i = -1; i <= 1; i++){
for(int j = 0; j <= 1; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x==grey.getWidth()-1 && y==grey.getHeight()-1){
for(int i = -1; i <= 0; i++){
for(int j = -1; j <= 0; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x==grey.getWidth()-1 && y!=grey.getHeight()-1){
for(int i = -1; i <= 0; i++){
for(int j = -1; j <= 1; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else if(x!=grey.getWidth()-1 && y==grey.getHeight()-1){
for(int i = -1; i <= 1; i++){
for(int j = -1; j <= 0; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}else{
for(int i = -1; i <= 1; i++){
for(int j = -1; j <= 1; j++){
result += new Color(grey.getRGB(x+i,y+j)).getRed()*base[j+1][i+1];
}
}
}
return result;
}
//performs the algorithm to combine the horizontal sweep and vertical sweep
private static void combineSobel(){
sobelTotal = new double[grey.getWidth()][grey.getHeight()];
for(int i = 0; i <grey.getWidth(); i++){
for(int j = 0; j<grey.getHeight(); j++){
sobelTotal[i][j] = Math.round(Math.sqrt(Math.pow((double)sobelX[i][j],2) + Math.pow((double)sobelY[i][j],2)));
}
}
}
private static void circleDetection(BufferedImage image) throws Exception {
//sets the radius relative to 1/6 of the smallest side of the image, helps reduce space taken in memory during
//runtime
int radius;
if (image.getHeight() < image.getWidth()) {
radius = image.getHeight() / 6;
} else {
radius = image.getWidth() / 6;
}
//sets a 3D space array of ints to hold 'hits' in x, y, and r planes
int[][][] A = new int[image.getWidth()][image.getHeight()][radius];
BufferedImage newImage = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
for (int rad = 0; rad < radius; rad++) {
for (int x = 0; x < newImage.getWidth(); x++) {
for (int y = 0; y < newImage.getHeight(); y++) {
//if the given pixel is above the threshold, a circle will be drawn at radius rad around it and if it
//is a valid coordinate it will be accumulated in the A array and plotted in the pointSpace image
if (sobelTotal[x][y] > threshold) {
for (int t = 0; t <= 360; t++) {
Integer a = (int) Math.floor(x - rad * Math.cos(t * Math.PI / 180));
Integer b = (int) Math.floor(y - rad * Math.sin(t * Math.PI / 180));
if (!((0 > a || a > newImage.getWidth() - 1) || (0 > b || b > newImage.getHeight() - 1))) {
Color c = new Color(newImage.getRGB(a, b));
Color c1;
if (c.getBlue() == 255) {
c1 = new Color(c.getRed(), c.getGreen() + 1, 0);
} else if (c.getGreen() == 255) {
c1 = new Color(c.getRed() + 1, 0, c.getBlue());
} else {
c1 = new Color(c.getRed(), c.getGreen(), c.getBlue() + 1);
}
newImage.setRGB(a, b, c1.getRGB());
if (!(a.equals(x) && b.equals(y))) {
A[a][b][rad] += 1;
}
}
}
}
}
}
}
//iterates to find the max value in the A array
int max = 0;
for (int x = 0; x < image.getWidth(); x++) {
for (int y = 0; y < image.getHeight(); y++) {
for (int r = 5; r < radius; r++) {
if (A[x][y][r] > max) {
max = A[x][y][r];
maxX = x;
maxY = y;
maxR = r;
}
}
}
}
//outputs the pointSpace image
System.out.println(maxX + " " + maxY + " " + maxR);
File newfile = new File(path + "\\result\\pointSpace.png");
ImageIO.write(newImage, "png", newfile);
}
//changes the brightness of an image by the factor given
private static BufferedImage changeBrightness(float brightenFactor, BufferedImage image){
RescaleOp op = new RescaleOp(brightenFactor, 0, null);
image = op.filter(image, image);
return image;
}
} |
Détection de cercle
Répondre avec citation
Partager