From 4eb85189e547f6175ef0f626565ebf9ad51313de Mon Sep 17 00:00:00 2001
From: Dmitry Retinskiy <dmitry.retinskiy@itseez.com>
Date: Wed, 14 Aug 2013 15:30:35 +0400
Subject: [PATCH] bug #3094: added CV_Assert to PyrDown_ to check if source
 matrix is not empty

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

diff --git a/modules/imgproc/src/pyramids.cpp b/modules/imgproc/src/pyramids.cpp
index e7d315cb5..01e510e7d 100644
--- a/modules/imgproc/src/pyramids.cpp
+++ b/modules/imgproc/src/pyramids.cpp
@@ -191,6 +191,7 @@ pyrDown_( const Mat& _src, Mat& _dst, int borderType )
     typedef typename CastOp::type1 WT;
     typedef typename CastOp::rtype T;
 
+    CV_Assert( !_src.empty() );
     Size ssize = _src.size(), dsize = _dst.size();
     int cn = _src.channels();
     int bufstep = (int)alignSize(dsize.width*cn, 16);