diff --git a/calculate_center.sh b/calculate_center.sh
new file mode 100644
index 0000000..36ab993
--- /dev/null
+++ b/calculate_center.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+echo "scale=2;${1}+((${2}-${1})/2.0)" | bc
diff --git a/fourcell/normalize.py b/fourcell/normalize.py
index 5b168fc..60a9fe3 100644
--- a/fourcell/normalize.py
+++ b/fourcell/normalize.py
@@ -24,7 +24,7 @@ def display (image) :
 	resized = image_resize(image, 800, 800)
 	cv2.imshow('img', resized)
 	
-	while True:
+	while cv2.getWindowProperty('img', cv2.WND_PROP_VISIBLE) > 0:
 		key = cv2.waitKey(0)
 		if key == 27:
 			cv2.destroyAllWindows()
@@ -244,7 +244,7 @@ def find_hole_punches (img) :
 	i = 0
 	for hp in holePunches :
 		hp['order'] = i 
-		#cv2.putText(img, str(i + 1), (hp['x'], hp['y']), cv2.FONT_HERSHEY_SIMPLEX, 20, (0, 0, 255), 5, cv2.LINE_AA, False)
+		cv2.putText(img, str(i + 1), (hp['x'], hp['y']), cv2.FONT_HERSHEY_SIMPLEX, 20, (0, 0, 255), 5, cv2.LINE_AA, False)
 		i+=1
 
 	return holePunches
@@ -382,7 +382,7 @@ print(f'Offset: {offset[0]},{offset[1]}')
 
 
 
-
+display(img)
 #normal = place(blank, rotated, 0, 0)
 
 #display(normal)
\ No newline at end of file