Hi ive managed to crop a still image from my webcam giving co-ordinates but i cant work out how to do it to the co-ordinates of the rectangle which apears using face detect. any suggestions (im quite new to processing btw)

-----code-------

import processing.video.*;
import FaceDetect.*;

FaceDetect fd;
Capture cam;


int MAX = 10;

int[] x = new int[MAX];
int[] y = new int[MAX];
int[] r = new int[MAX];
int[][] Faces = new int[MAX][3];

void setup(){

 size(640,480,P3D);
 cam = new Capture(this, 640, 480);
 fd = new FaceDetect(this);
 fd.start("haarcascade_frontalface_alt.xml", width,height,30);
 stroke(255,200,0);
 
 noFill();
}

void draw(){
 if (cam.available()) {
   cam.read();
   image(cam,0,0);

   Faces = fd.face(cam);
   int count = Faces.length;
   //    println(count);
   if (count>0) {
     for (int i = 0;i<count;i++) {
       x[i] = Faces[i][0];
       y[i] = Faces[i][1];
       r[i] = Faces[i][2] * 2;
       rectMode(CENTER);
       rect(x[i],y[i],r[i],r[i]);// co-ordinates i want to
//crop to
     }
   }
 }
}

--------code------------

Hi Seany and Marco,
I'm trying to do the same thing. Using Marco's code snippets I'm able to save black boxes the exact size of the facetracking rectangle, but with no face in them!

Here's my code, and help would be greatly appreciated:

import hypermedia.video.*;
PImage cropped;
OpenCV opencv;
int n = 0;

// contrast/brightness values
int contrast_value    = 0;
int brightness_value  = 0;


void setup() {

 size( 320, 240 );

 opencv = new OpenCV( this );
 opencv.capture( width, height );                  
 opencv.cascade( OpenCV.CASCADE_FRONTALFACE_ALT );  

}

public void stop() {
 opencv.stop();
 super.stop();
}

void draw() {

 opencv.read();
 opencv.flip( OpenCV.FLIP_HORIZONTAL );
 opencv.contrast( contrast_value );
 opencv.brightness( brightness_value );

 Rectangle[] faces = opencv.detect( 1.2, 2, OpenCV.HAAR_DO_CANNY_PRUNING, 40, 40 );

 // display the image
 image( opencv.image(), 0, 0 );

 // draw face area(s)
 noFill();
 stroke(255,0,0);
 for( int i=0; i<faces.length; i++ ) {
   rect( faces[i].x, faces[i].y, faces[i].width, faces[i].height );

   if (faces.length!=0)  

   {

     cropped=createImage(faces[0].width,faces[0].height,RGB);
     cropped.copy(faces[0].x,faces[0].y,faces[0].width,faces[0].height,0,0,faces[0].width,faces[0].height);
   }
 }
}

void keyPressed() {
 n = n+1;
 cropped.save("final" + n + ".jpg");
}

/**
* Changes contrast/brigthness values
*/
void mouseDragged() {
 contrast_value   = (int) map( mouseX, 0, width, -128, 128 );
 brightness_value = (int) map( mouseY, 0, width, -128, 128 );
}