Hi!
I'm using for the first time the openCV library for a school project.
I'm trying to track blobs on form a movie file. It all works well, but the problem is the the identified blobs don't appear to be " fixed". If you run the code you will see a line starting from the mouse position that should point at the centroid of  ONE of the two blobs, but it constantly changes from one to the other. Doing some research i saw that probably the issue is that the blobs don't have specific IDs....but i couldn't find any example of how to solve that in processing....

Can anyone help me?? :)

1. import hypermedia.video.*;
   
   OpenCV opencv;
   
   void setup() {
   
     size( 800, 548 );
   
     // open video stream
     opencv = new OpenCV( this );
     opencv.movie( "prova.mov", width, height );
   }
   
   void draw() {
   
   
   
     opencv.read();                  // read a new frame
     image( opencv.image(), 0, 0 );  // and display image      // grab frame from camera
     opencv.threshold(80);    // set black & white threshold
     fill(250, 0, 255, 80);
     noStroke();
     ellipse(mouseX, mouseY, 50, 50);
     // find blobs
     Blob[] blobs = opencv.blobs( 10, width*height/2, 100, true, OpenCV.MAX_VERTICES*4 );
   
     // draw blob results
     for ( int i=0; i<blobs.length; i++ ) {
       //        beginShape();
       //        for( int j=0; j<blobs[i].points.length; j++ ) {
       //            vertex( blobs[i].points[j].x, blobs[i].points[j].y );
       //        }
       //        endShape(CLOSE);
     }
   
   
     int X01= blobs[0].centroid.x;
     int Y01=blobs[0].centroid.y; 
   
   
     int myX= blobs[1].centroid.x;
     int myY=blobs[1].centroid.y;
   
     //  println(X01 + " " + X);
   
     if (dist(mouseX, mouseY, myX, myY)>10) {
       fill(255);
       textSize(48);
     //  text("Sound1", 0, 50);
       println("X "+ myX + " " +myY);
     }
     else if (dist(mouseX, mouseY, X01, Y01)<=5) {
       fill(255);
       textSize(48);
      // text("Sound2", 0, 50);
     }
   
     stroke(255);
     line(mouseX, mouseY, myX, myY);
    // line(mouseX, mouseY, X01, Y01);
   }