From e383d39598e4f09063067ed2f4953d8dbd756b3a Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <vadim.pisarevsky@gmail.com>
Date: Wed, 9 Jan 2013 17:53:19 +0400
Subject: [PATCH] fixed bug #2679

---
 modules/imgproc/src/templmatch.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/imgproc/src/templmatch.cpp b/modules/imgproc/src/templmatch.cpp
index 5e1ad20343..0a3b95d7c7 100644
--- a/modules/imgproc/src/templmatch.cpp
+++ b/modules/imgproc/src/templmatch.cpp
@@ -346,7 +346,10 @@ void cv::matchTemplate( InputArray _img, InputArray _templ, OutputArray _result,
                 }
 
                 if( numType == 2 )
+                {
                     num = wndSum2 - 2*num + templSum2;
+                    num = MAX(num, 0.);
+                }
             }
 
             if( isNormed )