Looks like strongly tied to hardware. Ask the manufacturer if it has a Java library/driver. Otherwise, if it offers only a C (native code) driver, you have to write an interface with JNI or JNA.

I have the same problem. Now I use the library JMyron and try to  combine the brightness tracking function with using webcam as mouse function. It works well when it has only one brightest glob in the screen. However, if there are multi brightest globs, the camera just get to confuse. I guess "boolean[]" would control each mouse's availability, and give true/fales value to each new mouse...  I have no idea now

this is my code and if any one can continue it...:

import JMyron.*;
JMyron m;

int maxMice = 5;
// flags that control each mouse's availability
boolean[] isFree = new boolean[maxMice];

float objx = 320;
float objy = 240;
float objdestx = 320;
float objdesty = 240;

void setup(){
 size(320,240);
 m = new JMyron();//make a new instance of the object
 m.start(width,height);//start a capture
 m.trackColor(255,255,255,2);//R, G, B, and range of similarity
 m.minDensity(100); //minimum pixels in the glob required to result in a box
 println("Myron " + m.version());
 noFill();
}

void draw(){
 m.update();//update the camera view
 //background(255);
 drawCamera();//draw the camera to the screen
 int[][] b = m.globBoxes();//get the center points

 float avX=0;
 float avY=0;
   
 //draw the boxes
 stroke(255,0,0);
 for(int i=0;i<b.length;i++){
   rect( b[i][0] , b[i][1] , b[i][2] , b[i][3] );
   
   avX += b[i][0];
   avY += b[i][1];
 }

  if(b.length-1>0){
   avX/=b.length-1;
   avY/=b.length-1;
 }

//mouse follow
  if(!(avX==0&&avY==0)&&b.length>0){
   objdestx = avX;
   objdesty = avY;
 }
 objx += (objdestx-objx)/10.0f;
 objy += (objdesty-objy)/10.0f;
 noFill();
 
 ellipse(objx,objy,30,30);

}


void drawCamera(){
 int[] img = m.image(); //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();

}

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

Where did you get that piece of hardware? Do you have any link / documentation?