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| 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
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