code: def pixels_farther_than(self, depth_im, filter_equal_depth=False):
          
          # take closest pixel
          if filter_equal_depth:
              farther_px = np.where((self.data > depth_im.data) & (np.isfinite(depth_im.data)))
          else:
              farther_px = np.where((self.data >= depth_im.data) & (np.isfinite(depth_im.data)))
          farther_px = np.c_[farther_px[0], farther_px[1]]
          return farther_px
docs: Returns the pixels that are farther away
          than those in the corresponding depth image.
  
          Parameters
          ----------
          depth_im : :obj:`DepthImage`
              depth image to query replacement with
          filter_equal_depth : bool
              whether or not to mark depth values that are equal
  
          Returns
          -------
          :obj:`numpy.ndarray`
              the pixels