docs: def __flip(self, sliceimg):
          """
          Flip if asked in self.flipV or self.flipH
          :param sliceimg: one image slice
          :return: flipp
          """
          if self.flipH:
              sliceimg = sliceimg[:, -1:0:-1]
  
          if self.flipV:
              sliceimg = sliceimg [-1:0:-1,:]
  
          return sliceimg