code: def show_double_active_img(name, img):
      mat = img.astype(np.float32)
      mat = mat * 128.0
      mat = mat + 127.0
      mat[mat < 0] = 0
      mat[mat > 255] = 255
      cv2.imshow(name, mat.astype(np.uint8))
      return
  
imports: import numpy
  import cv2
  from scipy import ndimage
label_desc: Use image node_id 18 for calling a global function with example usage: show_double_active_img(name, img) without return types