code: def fill(image, mask=None, iterations=1):
      '''Fill isolated black pixels
      
      1 1 1     1 1 1
      1 0 1 ->  1 1 1
      1 1 1     1 1 1
      '''
      global fill_table
      if mask is None:
          masked_image = image
      else:
          masked_image = image.astype(bool).copy()
          masked_image[~mask] = True
      result = table_lookup(masked_image, fill_table, True, iterations)
      if not mask is None:
          result[~mask] = image[~mask]
      return resulf fill(image, mask=None, iterations=1):
      '''Fill isolated black pixels
      
      1 1 1     1 1 1
      1 0 1 ->  1 1 1
      1 1 1     1 1 1
      '''
      global fill_table
      if mask is None:
          masked_image = image
      else:
          masked_image = image.astype(bool).copy()
          masked_image[~mask] = True
      result = table_lookup(masked_image, fill_table, True, iterations)
      if not mask is None:
          result[~mask] = image[~mask]
      return result
docs: Fill isolated black pixels
      
      1 1 1     1 1 1
      1 0 1 ->  1 1 1
      1 1 1     1 1 1