docs: public boolean process(ImagePyramid<I> image , Rectangle2D_F64 targetRectangle ) {
  
  		boolean success = true;
  		updateCurrent(image);
  
  		// create feature tracks
  		spawnGrid(targetRectangle);
  
  		// track features while computing forward/backward error and NCC error
  		if( !trackFeature() )
  			success = false;
  
  		// makes the current image into a previous image
  		setCurrentToPrevious();
  
  		return success;
  	}