Update app.py

app.py

@@ -18,7 +18,7 @@ def preprocess(img):
 
     # Dilate the edges
     kernel = np.ones((3, 3))
-    img_dilate = cv2.dilate(img_canny, kernel, iterations=1)
+    img_dilate = cv2.dilate(img_canny, kernel, iterations=2)
     cv2.imwrite("4_dilate.png", img_dilate)
 
     # Erode the dilated edges