code: def coins():
      """Greek coins from Pompeii.
  
      This image shows several coins outlined against a gray background.
      It is especially useful in, e.g. segmentation tests, where
      individual objects need to be identified against a background.
      The background shares enough grey levels with the coins that a
      simple segmentation is not sufficient.
  
      Notes
      -----
      This image was downloaded from the
      `Brooklyn Museum Collection
      <https://www.brooklynmuseum.org/opencollection/archives/image/51611>`__.
  
      No known copyright restrictions.
  
      Returns
      -------
      coins : (303, 384) uint8 ndarray
          Coins image.
      """
      return _load("data/coins.png")
  
imports: import numpy
  import shutil
  from ..util.dtype import img_as_bool
  from ._registry import registry, registry_urls
  from ..None import __version__
  import os.path
  import os
label_desc: Use image node_id 20 for calling a global function with example usage: coins() and returns: _load