Update app.py

app.py

@@ -3,7 +3,7 @@ import os
 import cv2
 import numpy as np
 from PIL import Image
-from paddleocr import PPStructure,save_structure_res
+from paddleocr import PPStructure, save_structure_res, draw_structure_result
 from paddleocr.ppstructure.recovery.recovery_to_doc import sorted_layout_boxes, convert_info_docx
 
 # Chinese image