1. public native Rectangle[] detect( float scale, int min_neighbors, int flags, int min_width, int min_height );
2. public Rectangle[] detect() {
3. return detect( 1.1f, 3, 0, 0, 0 );
4. }

 Maybe it's somewhere in the OpenCV frameworks files, but I can't track it down. I have little practical programming experience of this sort. What's goin on? Here is the code I'm using to troubleshoot.

2. import hypermedia.video.*;
3. import java.awt.Rectangle;
4. 
   
5. OpenCV opencv;
6. 
   
7. void setup() {
8. 
   
9.     size( 320, 240 );
10. 
    
11.     opencv = new OpenCV(this);
12.     opencv.capture( width, height );
13.     opencv.cascade( OpenCV.CASCADE_FRONTALFACE_ALT );    // load the FRONTALFACE description file
14. }
15. 
    
16. void draw() {
17.     
18.     opencv.read();
19.     image( opencv.image(), 0, 0 );
20.     
21.     // detect anything ressembling a FRONTALFACE
22.     Rectangle[] faces = opencv.detect(1.2, 3, OpenCV.HAAR_DO_CANNY_PRUNING, 20, 20);
23.     
24.     // draw detected face area(s)
25.     noFill();
26.     stroke(255,0,0);
27.     for( int i=0; i<faces.length; i++ ) {
28.         rect( faces[i].x, faces[i].y, faces[i].width, faces[i].height ); 
29.         rect( faces[i].x + 0.5*faces[i].width, faces[i].y + 0.34*faces[i].height, 5, 5 ); 
30.         
31.         if (!faces[i].isEmpty()) 
32.         {
33.           println("there is a face");
34.         }
35. 
    
36.         //never enters
37.          if (faces[i].width == 0) 
38.         {
39.           println("zero w");
40.         }
41. 
    
42.         print("(" + faces[i].x + "," + faces[i].y + ") ");
43.         println("w: " + faces[i].width + ", h: " + faces[i].height);
44.     }
45. }