diff --git a/exp/hough.py b/exp/hough.py
--- a/exp/hough.py
+++ b/exp/hough.py
@@ -27,6 +27,7 @@ class LineBag:
 		res=[]
 		for (score,alpha,beta,peaks) in self._lines:
 			if any(abs(alpha-gamma)<10 and abs(beta-delta)<10 for (_,gamma,delta,_) in res): continue
+			# avoid intersecting lines
 			if any((beta-delta)!=0 and (alpha-gamma)/(beta-delta)<0 for (_,gamma,delta,_) in res): continue
 			res.append((score,alpha,beta,peaks))
 			if len(res)>=count: break
@@ -65,7 +66,7 @@ class HoughTransform:
 				(alphaDeg,d)=keys[k]
 				line=Line(alphaDeg*math.pi/180,d-self._diagLen//2)
 				res[-1].append(self._transformOutput(line))
-			res[-1].sort(key=lambda line: line.d)
+			res[-1].sort(key=lambda line: line.d if line.alpha<math.pi else -line.d)
 			i+=1
 
 		self.show(img)