Update app.py

app.py

@@ -177,7 +177,7 @@ def main():
             su_matrix = cv2.getPerspectiveTransform(su_pts1,su_pts2)  
             su_imagewrap = cv2.warpPerspective(puzzle,su_matrix,(450,450))
             su_imagewrap =cv2.cvtColor(su_imagewrap, cv2.COLOR_BGR2GRAY)
-             _, su_imagewrap = cv2.threshold(su_imagewrap, 127, 255, cv2.THRESH_BINARY)
+            _, su_imagewrap = cv2.threshold(su_imagewrap, 127, 255, cv2.THRESH_BINARY)
 
         sudoku_cell = splitcells(su_imagewrap)
         sudoku_cell_croped= CropCell(sudoku_cell)