From 98f090e390313c0f3073187cd2775dfcb3d40ffc Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Wed, 18 May 2011 13:05:46 +0000
Subject: [PATCH] fixed bug with crash in HoughCircles & HoughLines when no
 circles/lines are detected (ticket #1066)

---
 modules/imgproc/src/hough.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/imgproc/src/hough.cpp b/modules/imgproc/src/hough.cpp
index 51d32602ee..b1a96715e8 100644
--- a/modules/imgproc/src/hough.cpp
+++ b/modules/imgproc/src/hough.cpp
@@ -1092,7 +1092,7 @@ const int STORAGE_SIZE = 1 << 12;
 
 static void seqToMat(const CvSeq* seq, OutputArray& _arr)
 {
-    if( seq )
+    if( seq && seq->total > 0 )
     {
         _arr.create(1, seq->total, seq->flags, -1, true);
         Mat arr = _arr.getMat();