Hi I'm trying to track my mouse with a web cam onto the screen so that the movement becomes a line. At the moment it takes the average movement and draws up a line, but there is also a lot of squares drawn out that I would like to get rid of. Pleaaaaaaase help me?

Best,
Jenny

This is how it looks at the moment:



The code I'm using is:
/*

the green oval is an averaged position of all the detected dark movement in the camera's view.

physical setup:
 - make sure there is a strong value contrast between your hand and a white background.
 - set all camera settings to "manual" for the most stable results.
 
last tested to work in Processing 0090

JTNIMOY

*/

import JMyron.*;

JMyron m;//a camera object

//variables to maintain the floating green circle
float objx = 160;
float objy = 120;
float objdestx = 160;
float objdesty = 120;

float[] xHist;
float[] yHist;
int xHistIndex = 0;
int yHistIndex = 0;

void setup(){
 size(1440,900);
  xHist = new float[1000]; // hur manga frames man kan lagra
  yHist = new float[1000];
 
 m = new JMyron();//make a new instance of the object
 m.start(width,height);//start a capture at 320x240
 m.trackColor(255,255,255,256*3-100);//track white
 m.update();
 m.adaptivity(10);
 m.adapt();// immediately take a snapshot of the background for differencing
 println("Myron " + m.version());
 rectMode(CENTER);
 noStroke();
}


void draw(){
 m.update();//update the camera view
 drawCamera();
 
 int[][] centers = m.globCenters();//get the center points
 //draw all the dots while calculating the average.
 float avX=0;
 float avY=0;
 for(int i=0;i<centers.length;i++){
   fill(80);
   rect(centers[i][0],centers[i][1],5,5);
   avX += centers[i][0];
   avY += centers[i][1];
 }
 if(centers.length-1>0){
   avX/=centers.length-1;
   avY/=centers.length-1;
 }

 //draw the average of all the points in red.
 fill(255,0,0);
// rect(avX,avY,5,5);

 //update the location of the thing on the screen.
 if(!(avX==0&&avY==0)&&centers.length>0){
   objdestx = avX;
   objdesty = avY;
 }
 objx += (objdestx-objx)/5.0f;
 objy += (objdesty-objy)/5.0f;
 fill(30,100,0);
 ellipseMode(CENTER);
 xHist[xHistIndex++] = objx;
 yHist[yHistIndex++] = objy;
 
 for(int i=1; i<xHistIndex; i++) {
     //ellipse(xHist[i],yHist[i],10,10);// hur tjockt streck (tva sista vardena)
     stroke(255,0,0);
     line(xHist[i-1],yHist[i-1],xHist[i],yHist[i]);
 }
}

void drawCamera(){
//  int[] img = m.differenceImage(); //get the normal image of the camera
 loadPixels();
 for(int i=0;i<width*height;i++){ //loop through all the pixels
//    pixels[i] = img[i]; //draw each pixel to the screen
 }
 updatePixels();
}

void mousePressed(){
 m.settings();//click the window to get the settings
}

public void stop(){
 m.stop();//stop the object
 super.stop();
}

jenny,

looking at the code... the squares are the points of which your "mouse" movement is averaged of. They are drawn in the first for-loop of your draw method. And because you're not clearing the background each frame, they add up.
http://processing.org/reference/background_.html