code: public int getUnknownCameraCount() {
  		int total = 0;
  		for (int i = 0; i < cameras.length; i++) {
  			if( !cameras[i].known) {
  				total++;
  			}
  		}
  		return total;
  	}
docs: Returns the number of cameras with parameters that are not fixed
  @return non-fixed camera count