diff --git a/exp/board_detect.py b/exp/board_detect.py
--- a/exp/board_detect.py
+++ b/exp/board_detect.py
@@ -13,7 +13,7 @@ import scipy.cluster
 import scipy.ndimage
 import scipy.signal
 
-from geometry import Line, point2lineDistance
+from geometry import Line
 from polar_hough import PolarHough
 from annotations import DataFile,computeBoundingBox
 from hough import show,prepareEdgeImg,HoughTransform