code: def normalized_distance(self, image):
          
          return self.__distance(
              self.__original_image_for_distance,
              image,
              bounds=self.bounds())
docs: Calculates the distance of a given image to the
          original image.
  
          Parameters
          ----------
          image : `numpy.ndarray`
              The image that should be compared to the original image.
  
          Returns
          -------
          :class:`Distance`
              The distance between the given image and the original image.