code: def get_image(self):
          
          if self._imgobj is not None:
              # quick optomization
              return self._imgobj.get_image()
  
          canvas_img = self.get_canvas_image()
          return canvas_img.get_image()
docs: Get the image currently being displayed.
  
          Returns
          -------
          image : `~ginga.AstroImage.AstroImage` or `~ginga.RGBImage.RGBImage`
              Image object.