docs: def _resize_if_required(self):
          """
          :return:
          """
          # orig_dtype = self.binar_segmentation.dtype
  
          # if orig_dtype == np.bool:
          #     segmentation = self.binar_segmentation.astype(np.int8)
          # else:
          #     segmentation = self.binar_segmentation
          if self.resized_segmentation is None:
              # segmentation = self.binar_segmentation
              segmentation = self.segmentation
  
              segmentation = segmentation[::self.degrad, ::self.degrad, ::self.degrad]
              voxelsize_mm = self.voxelsize_mm * self.degrad
  
              if self.resize_mm_1d is not None:
                  logger.debug("resize begin")
                  new_voxelsize_mm = np.asarray([self.resize_mm_1d, self.resize_mm_1d, self.resize_mm_1d])
                  import imtools
                  prev_shape = segmentation.shape
                  segmentation = imtools.image_manipulation.resize_to_mm(segmentation, voxelsize_mm=voxelsize_mm,
                                                                         new_voxelsize_mm=new_voxelsize_mm, order=0)
                  voxelsize_mm = new_voxelsize_mm
                  logger.debug("resize finished, old shape = {}, new shape = {}".format(str(prev_shape), str(segmentation.shape)))
                  # logger.debug("segmentation min={}, max={}".format(np.min(segmentation), np.max(segmentation)))
              self.resized_segmentation = segmentation
              self.resized_voxelsize_mm = voxelsize_mm