getting the most prominent green object in the scene

edit

I am trying to recognize pedestrian traffic signal.I am converting the image to HSV color space, then applying in-range function to get only green lights.

This is my code:

public void onManagerConnected(int status) {
   switch (status) {
      case LoaderCallbackInterface.SUCCESS:
      {
         Log.i(TAG, "OpenCV loaded successfully...................");
         Mat img = null;
         try {
            img = Utils.loadResource(getBaseContext(), R.drawable.glarrygreen, Highgui.CV_LOAD_IMAGE_COLOR);
         } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }
         Mat mHSV = new Mat();
         Mat mRgba2=new Mat();
         Mat mHSVThreshed=new Mat();
         Imgproc.cvtColor(img, mHSV, Imgproc.COLOR_BGR2HSV,3);
         //This works for red lights
         Core.inRange(mHSV, new Scalar(0, 64, 200), new Scalar(69, 255, 255), mHSVThreshed);
         //this works for green lights
         Core.inRange(mHSV, new Scalar(85, 64, 200), new Scalar(170, 255, 255), mHSVThreshed);
         Imgproc.cvtColor(mHSVThreshed, img, Imgproc.COLOR_GRAY2BGR, 0);
         Imgproc.cvtColor(img, mRgba2, Imgproc.COLOR_BGR2RGBA, 0);
         Bitmap bmp = Bitmap.createBitmap(img.cols(), img.rows(), Bitmap.Config.ARGB_8888);
         Utils.matToBitmap(mRgba2, bmp);
      }
   }
}

Here is my input and output images

Now I need to filter out other green signals in the scene.How do I do this?How do I get the most prominent green signal in the scene.