Update app.py

app.py

@@ -44,12 +44,15 @@ def find_boundary(label_value, mask):
 
 def send_response(mask):
       vertices=[]
+      test=[]
       for contour in mask:
-        vertices.extend(contour)
-      
+        test.extend(contour.ravel())
+        ar=contour.astype(str)
+        vertices.extend(ar.ravel())
       return vertices
 
 
+
 def extract_window_edges(window_contours):
     windows=[]
     for contour in window_contours: