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how to video capture only a portion of the screen

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I've been working on this code which has a live feed of a webcam in the centre of the screen, and when you press 'a' it takes a screen shot, and then displays it in a grid on the screen around the live feed. The problem is that it takes a full screen shot, so all the photos around the web cam are smaller, can anyone suggest something?
Thanks
heres the code so far:

import processing.video.*;

int w = 640;  
int h = 480; 
int fps = 25;  
int i = 0;
PImage img;
PImage img2;
PImage img3;
PImage img4;
PImage img5;
PImage img6;
PImage img7;
PImage img8;
Capture cam;  

void setup()
{
  size(screen.width, screen.height, P3D);  

  frameRate(fps);    

  cam = new Capture(this, w, h);  
  img = loadImage("person-1.tif" );
  img2 = loadImage("person-2.tif" );
   img3 = loadImage("person-3.tif" );
    img4 = loadImage("person-4.tif" );
     img5 = loadImage("person-5.tif" );
      img6 = loadImage("person-6.tif" );
       img7 = loadImage("person-7.tif" );
        img8 = loadImage("person-8.tif" );
}

void draw()
{
//drop blue moon logog in here
  if (cam.available() == true) {  
    cam.read();
  }

  image(cam, width/3, height/3, width/3, height/3); 
  //}else{
  //image(
  //  image(
  //}

  tint(17);             
  noTint();           
 image(img, 0, 0, width/3, height/3);
 image(img2, width/3, 0, width/3, height/3);
 image(img3, 2*width/3, 0, width/3, height/3);
 image(img4, 0, 266, width/3, height/3);
 image(img5, 2*width/3, 266, width/3, height/3);
 image(img6, 0, 532, width/3, height/3);
 image(img7, width/3, 532, width/3, height/3);
 image(img8, 2*width/3, 532, width/3, height/3);
  
  if (keyPressed == true) {
    if (key == 'a') {
      filter( BLUR, 3 );
      filter( POSTERIZE, 12 );
      if (i < 8) {
        i++;
      }
      else i = 0;
      saveFrame ("person-"+i);
    }
//    if (key == 'b') {
//      image(img, 0, 0, 200, 200);
//    }
  }
}


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