diff --git a/exp/hough.py b/exp/hough.py
--- a/exp/hough.py
+++ b/exp/hough.py
@@ -59,11 +59,13 @@ class HoughTransform:
 			log.debug("alpha, beta: %s, %s",alpha,beta)
 			self._drawLine(img,alpha,beta,peaks,i)
 
+			res.append([])
 			keys=self._readLineKeys(alpha,beta)
 			for k in peaks:
 				(alphaDeg,d)=keys[k]
 				line=Line(alphaDeg*math.pi/180,d-self._diagLen//2)
-				res.append(self._transformOutput(line))
+				res[-1].append(self._transformOutput(line))
+			res[-1].sort(key=lambda line: line.d)
 			i+=1
 
 		self.show(img)