code: def testit(img_path):
      bgr = cv2.imread(img_path)
      decoder = WatermarkDecoder("bytes", 136)
      watermark = decoder.decode(bgr, "dwtDct")
      try:
          dec = watermark.decode("utf-8")
      except:
          dec = "null"
      print(dec)
  
imports: import cv2
  import fire
  from imwatermark import WatermarkDecoder
label_desc: Use image node_id 1 for calling a global function with example usage: testit(img_path) without return types