code: public int getUnknownCameraParameterCount() {
  		int total = 0;
  		for (int i = 0; i < cameras.length; i++) {
  			if( !cameras[i].known) {
  				total += cameras[i].model.getIntrinsicCount();
  			}
  		}
  		return total;
  	}
docs: Counts the total number of unknown camera parameters that will be optimized/
  
  @return Number of parameters