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problem using tracking in OpenCV

[1 Reply]
- 18-Nov-2010 01:26 PM
- Forum: Contributed Library Questions
Hi!

I'm trying to do some simple motion tracking with processing and the OpenCV library.

my programming skills are bare minimum, but I'm eager to learn and excited at how fast processing is at getting visible results.

anyway, what ive got untill now is this:
2. import hypermedia.video.*; // Imports the OpenCV library
3. OpenCV opencv; // Creates a new OpenCV Object
5. void setup() {
7. size( 480, 320 );
8. opencv = new OpenCV( this ); // Initialises the OpenCV object
9. opencv.capture( 480, 320 ); // Opens a video capture stream
10. }
12. void draw() {
14. opencv.read(); // Grabs a frame from the camera
15. opencv.absDiff(); // Calculates the absolute difference
16. opencv.convert( OpenCV.GRAY );
17. opencv.blur( OpenCV.BLUR, 4 );
18. opencv.threshold(10);
19. opencv.remember(); // Remembers the current frame
22. Blob[] blobs = opencv.blobs(20, 200, 4, true, 200); //Blob detection
23. stroke(255,0,0);
25. println(blobs.length);
27. if(blobs.length <= 1) {
28. float midtpunktx = blobs[0].centroid.x;
29. float midtpunkty = blobs[0].centroid.y;
30. rect(midtpunktx-5, midtpunkty-5, 10, 10); //drawing rectangle at blobs[0]
31. }
33. image( opencv.image(), 0, 0 ); // Display the difference image
34. opencv.restore();
35. }
up until blob detection it gives me a black/white image of the motion in frame.

Then I'm trying to get the x and y coordinates from the largest blob.

which doesn't seem to work.

blob.length returns "0" no matter how I tweak the settings of opencv.blobs()

Ive tried different solutions and asked a programmer friend for help, but nothing yielded results.

If anyone can help me out, It will greatly appriciated.

-hammedhaaret

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