Processamento de Imagens usando JAI

import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
import java.awt.Color;

import javax.imageio.ImageIO;
import java.net.URL;
import javax.media.jai.*;
 

import javax.media.jai.iterator.*;
import javax.media.jai.iterator.RandomIter;
import javax.media.jai.iterator.RandomIterFactory;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.*;

import com.sun.media.jai.widget.DisplayJAI;
 
public class SwingCapture extends Panel implements ActionListener
{
  public static Player player = null;
  public CaptureDeviceInfo di = null;
  public MediaLocator ml = null;
  public JButton capture = null;
  public Buffer buf = null;
  public Image img = null;
  public VideoFormat vf = null;
  public BufferToImage btoi = null;
  public DisplayJAI imgpanel = null;
  public SpinnerNumberModel sm1;
  public JSpinner jsp1;

 
public SwingCapture()
{
setLayout(new BorderLayout());
setSize(320,950);
 
imgpanel = new DisplayJAI();
imgpanel.setSize(320,240);
imgpanel.setLayout(null);

capture = new JButton("Executa Processamento");
capture.addActionListener(this);
sm1 = new SpinnerNumberModel();
jsp1 = new JSpinner(sm1);
this.add(jsp1,"East");
String str1 = "vfw:ICatch (VI) PC Camera:0";
String str2 = "vfw:Microsoft WDM Image Capture (Win32):1";
di = CaptureDeviceManager.getDevice(str2);
ml = di.getLocator();

 
try {
player = Manager.createRealizedPlayer(ml);
player.start();
Component comp;
 
if ((comp = player.getVisualComponent()) != null)
{
add(comp,BorderLayout.NORTH);
}
add(capture,BorderLayout.CENTER );
add(imgpanel,BorderLayout.SOUTH);
}
catch (Exception e)
{
e.printStackTrace();
}
}

public PlanarImage RGBtoGray(PlanarImage entrada){
  PlanarImage saida=null;	
 if (entrada.getNumBands() > 1)
      {
     
      double[][] matrix = {{ 0.114, 0.587, 0.299, 0 }};
      ParameterBlock pb = new ParameterBlock();
      pb.addSource(entrada);
      pb.add(matrix);
      saida = JAI.create("bandcombine", pb, null);
      
      }
      
 return saida;
}
 public PlanarImage Zoom(PlanarImage entrada,float escalaX,float escalaY){
	
	ParameterBlock pb = new ParameterBlock();
	pb.addSource(entrada);
	pb.add(escalaY);
	pb.add(escalaY);
	pb.add(0.0F); pb.add(0.0F);
	pb.add(new InterpolationNearest());
	PlanarImage scaledImage = JAI.create("scale", pb);
	
   return scaledImage;
 }
 
 public PlanarImage sobel(PlanarImage entrada){
  PlanarImage saida=null;
  	
 if (entrada.getNumBands() > 1)
      {
      System.out.println("Numero de pixels pretos: 4" );	
     float[] sobel_h_data        = { 1.0F,  0.0F, -1.0F,
                                       2.0F,  0.0F,  -2.0F,
                                       1.0F,  0.0F,  -1.0F};
     float[] sobel_v_data        = {-1.0F,  -2.0F,  -1.0F,
                                       0.0F,  0.0F,  0.0F,
                                       1.0F,  2.0F,  1.0F};

     KernelJAI kern_h = new KernelJAI(3,3,sobel_h_data);
     KernelJAI kern_v = new KernelJAI(3,3,sobel_v_data);

      	// Create the Gradient operation.
      PlanarImage im1 =(PlanarImage)JAI.create("gradientmagnitude", entrada,kern_h, kern_v);
      
      saida = im1;
      }else
      {
      	System.out.println(" else ");
      }
      
 return saida;
}

public void processaImagem(Image img, String s) {


  // Obt�m primeira imagem em preto-e-branco
  BufferedImage bi1 = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_BYTE_GRAY);

    

  

    Graphics2D g2d = bi1.createGraphics();
    g2d.drawImage(img, null, null);
    g2d.dispose();

  PlanarImage imagem123 = PlanarImage.wrapRenderedImage((RenderedImage)bi1);
  if (imagem123 == null)
  	System.out.println("� null" );
  	
   PlanarImage imagemRes = Zoom(imagem123, 1,1);
   imgpanel.set(imagemRes);  
    System.out.println("-----Final------------------------------------" );
}
public static void main(String[] args)
{
Frame f = new Frame("Captura de Imagem");
SwingCapture cf = new SwingCapture();
 
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
playerclose();
System.exit(0);}});
 
f.add("Center",cf);
f.pack();
f.setSize(new Dimension(320,550));
f.setVisible(true);
}
 
 
public static void playerclose()
{
player.close();
player.deallocate();
}
 
 
public void actionPerformed(ActionEvent e)
{
  JComponent c = (JComponent) e.getSource();
 
  if (c == capture)
  {
    // Capturar um Frame
    FrameGrabbingControl fgc = (FrameGrabbingControl)
    player.getControl("javax.media.control.FrameGrabbingControl");
    buf = fgc.grabFrame();
 
    // Convert�-lo para imagem
    btoi = new
    BufferToImage((VideoFormat)buf.getFormat());
    img = btoi.createImage(buf);
 
     
    // Salva a Imagem
    saveJPG(img,"c:\\Foto.jpg");
    
    // Executar os procedimentos
   processaImagem(img,"c:\\Foto.jpg");
    
          
  }

Exception in thread "main" java.lang.NullPointerException
        at SwingCapture.<init>(SwingCapture.java:61)
        at SwingCapture.main(SwingCapture.java:163)
Java Result: 1
CONSTRUÍDO COM SUCESSO (tempo total: 17 segundos)