code: def image_center(self):
      y_center = self.up + (self.down - self.up) / 2
      x_center = self.left + (self.right - self.left) / 2
      return y_center, x_center
  
imports: import enum
  from copy import deepcopy
  import numpy
  from skimage import img_as_ubyte
  from skimage.transform import rescale, resize
  from .countless2d import zero_corrected_countless
label_desc: Use image node_id 6 for calling the ObjectMask obj's underlying member method code with example usage: obj.image_center() and returns: y_center,  x_center