Video Tracking in Java

 import java.awt.*;
 import java.util.*;
 import java.awt.event.*;
 import java.awt.image.*;
 
 public class PickNTrack extends Frame {
 	static int kWidth ; //The overall size of your video
 	static int kHeight ;
 	static long elapsedTime; //For evaluating performace
 	static long now;
 	static int x = 0; //these are the x and y position of the dot you are drawing
 	static int y = 0;
 	static int redGoal = 210; //these describe the color you are chasing
 	static int greenGoal = 20; //255, 255, 255 would be white
 	static int blueGoal = 20;
 	static PixelSource ps; //this object from vbp.jar gives you access to video pixels
 	static ImageWrangler iw; //this object from vbp.jar converst from arrays to images
 	static PickNTrack myWindow;
 	static Image myImage; // An image for displaying the video frame
  	static boolean scanning = true;
 
 	PickNTrack() { //this is like startmovie
 		kWidth =320;
 		kHeight =240;
 	}
 	 public static void main(String args[]) { //always the first method called
  		myWindow = new PickNTrack();
  		myWindow.setSize(kWidth,kHeight);
 		myWindow.show();
 		myWindow.toFront();
 		myWindow.setLayout (null);
 
 		//These are the two objects that you are using out of vpb.jar
 		ps = new PixelSource(kWidth,kHeight);
 		iw = new ImageWrangler(ps.vidWidth,kHeight,ps.getMasks());
 
 		//add a listener for shutting the window, give it a method to call (thisWindowClosing)
 		myWindow.addWindowListener(new java.awt.event.WindowAdapter() {
 			public void windowClosing(java.awt.event.WindowEvent e) {
 				myWindow.thisWindowClosing(e);
 			}
 		});
 		//add a listener for clicking the mouse in the window, give it a method to call (MouseClicked)
 		myWindow.addMouseListener(new java.awt.event.MouseAdapter() {
 			public void mouseClicked(java.awt.event.MouseEvent e) {
 				myWindow.MouseClicked(e);
 			}
 		});
 		//add a listener for pressing a key , give it a method to call (KeyPressed)
 		myWindow.addKeyListener(new java.awt.event.KeyAdapter() {
 			public void keyPressed(java.awt.event.KeyEvent e) {
 				myWindow.KeyPressed(e);
 			}
 		});
 
 		/////////This is the main loop///////
 		while (scanning) //you may want to farm this out to a thread
 			{
 			 LookAtAFrame(); //we look through all the pixels
 			 myWindow.repaint(); // we paint the winner
 			}
 
 	}
 	static void LookAtAFrame() { //this is where the action is, where we go pixel by pixel through the video
  		int[] rgb;
  		int worldRecord = 60000; //some huge number
 	 	ps.grabFrame(); //grab a frame
 		for (int row = 0; row < kHeight; row++) {
 //REPEAT FOR EACH ROW OF PIXELS
 			for (int column = 0; column < kWidth; column++){
 //REPEAT FOR EACH PIXEL IN THE ROW
 				rgb = ps.getPixel(column,row);
 				int diff = Math.abs(rgb[0] - redGoal) +Math.abs(rgb[2]-blueGoal) + Math.abs(rgb[1 ] - greenGoal);
 					if (diff < worldRecord) {
 						//if the difference is smallest for this pixel
 						x = column; //remember this position
 						y = row;
 						worldRecord = diff ;
 						//reset the record
 					}
 			}//END FOR EACH PIXEL IN A ROW
 		}//END FOR EACH ROW OF PIXELS
 		try {Thread.sleep(1);} catch(InterruptedException e) {}
 		myImage = iw.imageFromArray(ps.getPixelArray()); //make a picture
 		elapsedTime = System.currentTimeMillis()-now; //for checking performance
 		now = System.currentTimeMillis();
 	}	 // end of lookat frame
 
 	public void update(Graphics g){ //avoid flicker, don't clear the screen
 		paint(g);
 	}
 	public void paint(Graphics g) { //this is where we paint
 		if (myImage != null){
 			g.drawImage(myImage,0,0,this);//the background video
 			g.setColor(Color.black);//black
 			g.fillOval( x-5,y-5,10,10);//the dot for tracking
 			g.setColor(new Color(redGoal, greenGoal, blueGoal));//black
 			g.fillOval( x-4,y-4,8,8);//the dot for tracking
 		}
  	}
  	public boolean MouseClicked(java.awt.event.MouseEvent evt){
 		//this repicks the color you are chasing
  		int[] rgb;
  		int x = evt.getX();
  		int y = evt.getY();
  		rgb = ps.getPixel(x,y);
  		redGoal = rgb[0];
 		greenGoal =rgb[1];
 		blueGoal = rgb[2];
  		System.out.println ("clicked x" + x + " y" + y + " R" + redGoal + " G" + greenGoal + " B" + blueGoal);
  		return(true);
  	}
 	public boolean KeyPressed(java.awt.event.KeyEvent e){ //pop up dialog
 		String whichKey =e.getKeyText(e.getKeyCode());
 		if (whichKey.equals("S")) { //press “s” to get video settings
 			ps.videoSettings();
 		}else if (whichKey.equals("T")) { //press “t” to see performance
 			System.out.println ("Time: " + elapsedTime + " ms/frame ");
 		}
 		return(true);
 	}
  	 void thisWindowClosing(java.awt.event.WindowEvent e) {
  		scanning = false;
  		System.out.println ("quit");
 		dispose();
 		ps.killSession();
 		System.exit(5);
 	}
 }