First post here, though I've been using the forum for help for a while. Couldn't think of a suitable title for the thread...

I've got a camera and projector set up pointing at a surface and part of what I need to do is (on a key press) project a black filled window for a moment, so that the projector projects nothing, and in this time have the camera capture a still image of whatever is in the frame. Then I want to project that image afterwards. This is just a small part of a bigger project so it might not make sense why I would want to do that.

Anyway, the problem I'm having is getting the camera to capture during this time period (which is set to 1 second for the moment). The way it's working currently is that it's capturing the frame immediately before the black second is projected.

This is the code so far. I have made several attempts trying to get cam.read(); to work at 500 milliseconds but it hasn't worked. Any help would be greatly appreciated. Thanks!

2. import processing.video.*;
3. 
   
4. int captureTimerStart;
5. int delaytime = 1000;
6. 
   
7. 
   
8. boolean timer = false;
9. 
   
10. Capture cam;
11. 
    
12. 
    
13. PImage scene; // "scene" is the main projected image that will be updated with each new capture
14. 
    
15. 
    
16. 
    
17. void setup() 
18. {
19.   size(1400, 1050); // 1400 by 1050 is the correct size for setup uding MacBookPro laptop and InFocus projector
20.   scene = loadImage("sceneTest.jpg");
21.   image(scene, 0, 0);
22.   cam = new Capture(this, 1400, 1050);
23.   cam.settings();  // choose camera and quality settings
24. }
25. 
    
26. 
    
27. void draw() 
28. {
29.  if(keyPressed) 
30.  {
31.     if (key == 'b' || key == 'B' && timer == false) // if 'b' is pressed and timer is not running
32.     {
33.       captureTimerStart = millis();
34.       //captureTimer = millis();
35.       timer = true; // start the timer
36.       
37.       fill(0); // set colour to black
38.       rect(0, 0, 1400, 1050); //project a blank frame
39.       
40.       cam.read(); //capture the current frame
41.      
42.      }
43.  }
44.  
45.      
46.      if (millis() - captureTimerStart >= delaytime) // when timer reaches zero
47.      {
48.        image(cam, 0, 0);
49.      }
50.   
51.   }