Face Detection Null Pointer Exception - nullpointerexception

Question

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.highgui.VideoCapture;
import org.opencv.objdetect.CascadeClassifier;
public class WebCam extends JPanel implements ActionListener{
private BufferedImage image;
public JButton button = new JButton("capture");
int count = 1;
public WebCam() {
super();
button.addActionListener((ActionListener) this);
this.add(button);
}
public BufferedImage getImage() {
return image;
}
public void setimage(BufferedImage newimage) {
image = newimage;
}
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (this.image == null) {
return;
}
g.drawImage(this.image, 0, 0, this.image.getWidth(), this.image.getHeight(), null);
}
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("face capture");
frame.setSize(300,400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
CascadeClassifier faceDetector = new CascadeClassifier("C:\\opencv\\sources\\data\\lbpcascades\\lbpcascade_frontalface.xml");
WebCam anan = new WebCam();
frame.add(anan);
frame.setVisible(true);
Mat webcam_image = new Mat();
MatToBufImg mat2Buf = new MatToBufImg();
VideoCapture capture = null;
try {
capture = new VideoCapture(0);
}
catch (Exception e){
}
if (capture.open(0)) {
while (true) {
capture.read(webcam_image);
if (!webcam_image.empty()) {
frame.setSize(webcam_image.width(), webcam_image.height());
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(webcam_image, faceDetections);
for (Rect rect : faceDetections.toArray()) {
Core.rectangle(webcam_image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));// mat2Buf, mat2Buf);
}
System.out.println("...............face detected: " + faceDetections.toArray().length);
if (faceDetections.toArray().length == 0) {
System.out.println("Face not detected!");
}
mat2Buf.setMatrix(webcam_image, ".jpg");
anan.setimage(mat2Buf.getBufferedImage());
anan.repaint();
}
else {
System.out.println("problem");
}
}
}
capture.release();
}
#Override
public void actionPerformed(ActionEvent e){
System.out.println("hellohellohellohellohello");
int width = 943;
int height = 640;
BufferedImage image = null;
File f = null;
String ans = JOptionPane.showInputDialog(null, "Color/Grey");
System.out.println(ans);
BufferedImage bi = image;
ImageIcon ii = null;
Image newimg = bi.getScaledInstance(320, 220, java.awt.Image.SCALE_SMOOTH);
ii = new ImageIcon(newimg);
Image i2 = ii.getImage();
image = new BufferedImage(i2.getWidth(null), i2.getHeight(null), BufferedImage.SCALE_SMOOTH);
image.getGraphics().drawImage(i2, 0, 0, null);
RenderedImage resim = null;
if (i2 instanceof RenderedImage) {
resim = (RenderedImage) i2;
} else {
BufferedImage anlikResim = null;
if (!ans.equalsIgnoreCase("color")) {
anlikResim = new BufferedImage(
ii.getIconWidth(),
ii.getIconHeight(),
BufferedImage.TYPE_BYTE_GRAY);
} else {
anlikResim = new BufferedImage(
ii.getIconWidth(),
ii.getIconHeight(),
BufferedImage.SCALE_SMOOTH);
}
Graphics2D g = anlikResim.createGraphics();
g.drawImage(i2, 0, 0, null);
g.dispose();
resim = anlikResim;
}
try {
f = new File("C:\\opencv\\build\\java\\x64\\");
ImageIO.write(resim, "jpg", f);
System.out.println("yes");
} catch (Exception ex) {
}
}
}
I am working on a face detection project. It used to work perfectly fine but suddenly ceased to work properly. When I run the program it gives a NullPointerException at line 120. How can I fix this problem?