Memahami Tentang EDGE DETECTION

KELOMPOK:
Kelas : 4IA11
Dina Amalia (50408283)
Risti Mustika Brilianti (50408732)

Tugas Pengolahan Citra kita membahas dan mencoba membuat EDGE DETECTION, pertama saya akan memperkenalkan EDGE DETECTION pendeteksian sisi itu apa? EDGE DETECTION adalah Sisi yang didefinisikan sebagai batas antara dua daerah yang memiliki perbedaan tingkat keabuan yang signifikan, sehingga dapat ditentukan berdasarkan nilai turunan pertama. Hal ini dilakukan dengan menghitung nilai gradien suatu piksel relatif terhadap piksel disekitarnya. Contoh:

aproksimasi turunan per-tama yang baik adalah operator Sobel dengan keuntungan efek smoothing.Karena dampak derivasi adalah meningkatkan noise, efek smoothing meru-pakan sautu fitur operator Sobel yang menguntungkan untuk mengurangi noise tersebut.

bentuk operasi sobel sebagai berikut:

horizontal:
sobel = {{-1,-2,-1},
{0 , 0, 0},
{1 , 2, 1}};

vertikal:
sobel = {{-1,0,1},
{-2,0,2},
{-1,0,1}};

Contoh EDGE DETECTION dengan menggunakan aplikasi program JAVA dan sudah berbasis GUI dalam pembahasan presentasi klompok saya seperti dibawah ini:

• menggunakan bentuk sobel horizontal:

kurang jelas? coba saya lampirkan source code dari sobel yang digunakan:
int c = 1;
double Gx=0, Gy=0, G;
boolean[][] b = new boolean[width][height];
int[][] array = new int[3][3];
int[][] sobel = {{-1,-2,-1},{0,0,0},{1,2,1}};

keseluruhan dari source code program ini :


/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

/*
* EdgeDetections.java
*
* Created on Nov 22, 2011, 5:02:27 AM
*/
//membuat folder edgedection//
package edgedetection;

import java.awt.Image;
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Timer;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
/**
*
*
*
*
* @author mondemonci
*/
public class EdgeDetections extends javax.swing.JFrame {
JFileChooser fc;
File file;
/** Creates new form EdgeDetections */
public EdgeDetections() {
initComponents();
fc = new JFileChooser();
fc.setFileSelectionMode(JFileChooser.FILES_ONLY);
DateFormat wk = new SimpleDateFormat("E, dd MMM yyyy");
DateFormat wk2 = new SimpleDateFormat("HH:mm:ss");
String si = wk.format(Calendar.getInstance().getTime());
jLabel5.setText(si);
Timer time = new Timer(1000, new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{

String jam, menit, detik;
Calendar now = Calendar.getInstance();
int h = now.get(Calendar.HOUR_OF_DAY);
int m = now.get(Calendar.MINUTE);
int s = now.get(Calendar.SECOND); if(h<10) jam = "0"+h;
else jam = String.valueOf(h);
if(m<10) menit = "0"+m;
else menit = String.valueOf(m);
if(s<10) detik = "0"+s;
else detik = String.valueOf(s);
jLabel6.setText(jam + ":" + menit + ":" + detik);

}
});
time.start();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
//
private void initComponents() {

jPanel1 = new javax.swing.JPanel();
jLayeredPane1 = new javax.swing.JLayeredPane();
jLayeredPane2 = new javax.swing.JLayeredPane();
jLabel2 = new javax.swing.JLabel();
jLayeredPane3 = new javax.swing.JLayeredPane();
jLabel3 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jButton2 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Edge Detection - Sobel");

jLayeredPane1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

jLayeredPane2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setText("No Picture Selected");
jLabel2.setBounds(10, 10, 320, 380);
jLayeredPane2.add(jLabel2, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLayeredPane2.setBounds(20, 50, 340, 400);
jLayeredPane1.add(jLayeredPane2, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLayeredPane3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel3.setText("No Picture Selected");
jLabel3.setBounds(10, 10, 330, 380);
jLayeredPane3.add(jLabel3, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLayeredPane3.setBounds(370, 50, 350, 400);
jLayeredPane1.add(jLayeredPane3, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLabel1.setText("Select a picture");
jLabel1.setBounds(10, 14, 120, 20);
jLayeredPane1.add(jLabel1, javax.swing.JLayeredPane.DEFAULT_LAYER);
jTextField1.setBounds(100, 10, 230, 30);
jLayeredPane1.add(jTextField1, javax.swing.JLayeredPane.DEFAULT_LAYER);

jButton1.setText("Browse");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton1.setBounds(340, 10, 90, 30);
jLayeredPane1.add(jButton1, javax.swing.JLayeredPane.DEFAULT_LAYER);

jButton3.setText("Clear");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton3.setBounds(440, 10, 80, 30);
jLayeredPane1.add(jButton3, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLabel5.setText("Load..");
jLabel5.setBounds(10, 480, 120, 14);
jLayeredPane1.add(jLabel5, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLabel6.setText("Wait..");
jLabel6.setBounds(120, 480, 110, 14);
jLayeredPane1.add(jLabel6, javax.swing.JLayeredPane.DEFAULT_LAYER);

jButton2.setText("Edge Detection");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton2.setBounds(550, 460, 170, 23);
jLayeredPane1.add(jButton2, javax.swing.JLayeredPane.DEFAULT_LAYER);

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLayeredPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 756, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLayeredPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 511, Short.MAX_VALUE)
);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);

pack();
}//

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:

int nilai = fc.showOpenDialog(this);
if(nilai==JFileChooser.APPROVE_OPTION){
file = fc.getSelectedFile();
jTextField1.setText(file.getName().toUpperCase());
if (jTextField1.getText().endsWith(".JPG")||jTextField1.getText().endsWith(".JPEG") || jTextField1.getText().endsWith(".PNG") || jTextField1.getText().endsWith(".GIF") || jTextField1.getText().endsWith(".BMP")) {

jTextField1.setText(file.getName());
ImageIcon icon = new ImageIcon(file.getPath());
Image img = icon.getImage();
Image newImg = img.getScaledInstance(300, 300, java.awt.Image.SCALE_SMOOTH);
ImageIcon icon2 = new ImageIcon(newImg);


jLabel2.setText("");
jLabel2.setIcon(icon2);

}
else{
jTextField1.setText("anda tidak memilih file Image");
}
}else{
jTextField1.setText("anda tidak memilih file");
}
jButton1.setEnabled(false);
}

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText("");
jLabel2.setIcon(null);
jLabel2.setText("No Picture Selected");
jLabel3.setIcon(null);
jLabel3.setText("No Picture Selected");
jButton1.setEnabled(true);
}

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
// TODO add your handling code here:
String nama = file.getName();
int threshold = 70;
String path = file.getPath();
BufferedImage bi = ImageIO.read(new File(path));

int width = bi.getWidth();
int height = bi.getHeight();

BufferedImage finalThresholdImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB) ;

int red = 0;
int green = 0;
int blue = 0;

int c = 1;
double Gx=0, Gy=0, G;
boolean[][] b = new boolean[width][height];
int[][] array = new int[3][3];
int[][] sobel = {{-1,-2,-1},{0,0,0},{1,2,1}};

for (int x = 0; x < width; x++) {
try {

for (int y = 0; y < height; y++) {
int color = bi.getRGB(x, y);

red = EdgeDetections.getRed(color);
green = EdgeDetections.getGreen(color);
blue = EdgeDetections.getBlue(color);

if((red+green+green)/3 < threshold) {
finalThresholdImage.setRGB(x,y,EdgeDetections.mixColor(0, 0,0));
}
else {
finalThresholdImage.setRGB(x,y,EdgeDetections.mixColor(255, 255,255));
}

}
} catch (Exception e) {
e.getMessage();
}
}
ImageIcon icon = new ImageIcon(finalThresholdImage);
Image newImg = icon.getImage().getScaledInstance(300, 300, java.awt.Image.SCALE_SMOOTH);
ImageIcon icon2 = new ImageIcon(newImg);
jLabel3.setText("");
jLabel3.setIcon(icon2);

} catch (IOException ex) {
Logger.getLogger(EdgeDetections.class.getName()).log(Level.SEVERE, null, ex);
}
}

private static int mixColor(int red, int green, int blue) {
return red<<16|green<<8|blue;
}
public static int getRed(int color) {
return (color & 0x00ff0000) >> 16;
}

public static int getGreen(int color) {
return (color & 0x0000ff00) >> 8;
}

public static int getBlue(int color) {
return (color & 0x000000ff) >> 0;

}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(EdgeDetections.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(EdgeDetections.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(EdgeDetections.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(EdgeDetections.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {
new EdgeDetections().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLayeredPane jLayeredPane1;
private javax.swing.JLayeredPane jLayeredPane2;
private javax.swing.JLayeredPane jLayeredPane3;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}

• tampilan EDGE DETECTION pada saat tampilan picture belum dimasukkan layar 1 digunakan untuk pengambilan picture asli dan layar 2 digunakan untuk setelah perubahan menjadi EDGE DETECTION.

· pada saat browse picture, kemudian pilih open

• setelah dibrowse maka akan tampil seperti contoh picture dibawah ini pada layar 1.

• kemudian pada tahap ini, dilakukan proses perubahan dari picture asli ke dalam EDGE DETECTION-nya.

catatan:

-kelemahan dari sobel itu sendiri adalah tidak bisa terlalu detail/rumit dalam suatu picture.

-kelebihannya dari sobel itu sendiri adalah sangat praktis dan mudah digunakan.