code: def depth_map(self):
      if self._depth is not None:
          return self._depth
      else:
          _depth = self.read_depth()
          return _depth
  
imports: import os
  import abc
  import numpy
  import imageio
  import PIL
  from PIL import Image
label_desc: Use image node_id 6 for calling the CapturedDepth obj's underlying member method code with example usage: obj.depth_map() and returns: self, _depth