Hello -

I'm looking to create an alarm (buzz/sound, etc), when the face is out of frame for a 30 seconds.  I'm not sure where to put an if statement using,     Rectangle[] faces = opencv.detect( 1.2, 2, OpenCV.HAAR_DO_CANNY_PRUNING, 40, 40 );.   Can anyone point a direction?  Thanks!
 

I'm using the following code:

1. import hypermedia.video.*;
2. import java.awt.Rectangle;
3. OpenCV opencv;
4. // contrast/brightness values
5. int contrast_value    = 0;
6. int brightness_value  = 0;
7. void setup() {
8.     size( 640, 480 );
9.     opencv = new OpenCV( this );
10.     opencv.capture( width, height );                   // open video stream
11.     opencv.cascade( OpenCV.CASCADE_FRONTALFACE_ALT );
    
12. }
13. public void stop() {
14.     opencv.stop();
15.     super.stop();
16. }
17. void draw() {
18.     // grab a new frame
19.     opencv.read();
20.     opencv.contrast( contrast_value );
21.     opencv.brightness( brightness_value );
22.     // proceed detection
23.     Rectangle[] faces = opencv.detect( 1.2, 2, OpenCV.HAAR_DO_CANNY_PRUNING, 40, 40 );
24.     // display the image
25.     image( opencv.image(), 0, 0 );
26.     // draw face area(s)
27.     noFill();
28.     stroke(255,0,0);
29.     for( int i=0; i<faces.length; i++ ) {
30.         rect( faces[i].x, faces[i].y, faces[i].width, faces[i].height );
31.     }
32. }