#### Previous topic

scipy.ndimage.grey_opening

#### Next topic

scipy.ndimage.morphological_gradient

# scipy.ndimage.iterate_structure

`scipy.ndimage.``iterate_structure`(structure, iterations, origin=None)

  Iterate a structure by dilating it with itself.

  Parameters: | structure : array_like Structuring element (an array of bools, for example), to be dilated with itself. iterations : int number of dilations performed on the structure with itself origin : optional If origin is None, only the iterated structure is returned. If not, a tuple of the iterated structure and the modified origin is returned.
  Returns: | iterate_structure : ndarray of bools A new structuring element obtained by dilating structure (iterations - 1) times with itself.

  See also

  `generate_binary_structure`

  Examples

      >>> from scipy import ndimage
      >>> struct = ndimage.generate_binary_structure(2, 1)
      >>> struct.astype(int)
      array([[0, 1, 0],
             [1, 1, 1],
             [0, 1, 0]])
      >>> ndimage.iterate_structure(struct, 2).astype(int)
      array([[0, 0, 1, 0, 0],
             [0, 1, 1, 1, 0],
             [1, 1, 1, 1, 1],
             [0, 1, 1, 1, 0],
             [0, 0, 1, 0, 0]])
      >>> ndimage.iterate_structure(struct, 3).astype(int)
      array([[0, 0, 0, 1, 0, 0, 0],
             [0, 0, 1, 1, 1, 0, 0],
             [0, 1, 1, 1, 1, 1, 0],
             [1, 1, 1, 1, 1, 1, 1],
             [0, 1, 1, 1, 1, 1, 0],
             [0, 0, 1, 1, 1, 0, 0],
             [0, 0, 0, 1, 0, 0, 0]])