code: def center_to_corner(cx, cy, h, w):
      xmin = cx - w / 2
      xmax = cx + w / 2
      ymin = cy - h / 2
      ymax = cy + h / 2
  
      return xmin, ymin, xmax, ymax
  
file_path: chitra/chitra/coordinates.py
imports: from typing import TYPE_CHECKING, List, Optional, Tuple, Union
  import numpy
  from imgaug.augmentables import bbs
label_desc: Use image node_id 4 for calling the BoundingBoxes obj's underlying member method code with example usage: obj.center_to_corner(cx, cy, h, w) and returns: xmin,  ymin,  xmax,  ymax