From f6c8e237f01f2337b8ab77b2396655bf3434811e Mon Sep 17 00:00:00 2001
From: Maria Dimashova <no@email>
Date: Fri, 30 Jul 2010 14:36:04 +0000
Subject: [PATCH] fixed compile error on VS2008

---
 modules/features2d/src/keypoint.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/features2d/src/keypoint.cpp b/modules/features2d/src/keypoint.cpp
index 9ce7311..6df98cb 100644
--- a/modules/features2d/src/keypoint.cpp
+++ b/modules/features2d/src/keypoint.cpp
@@ -143,7 +143,7 @@ float KeyPoint::overlap( const KeyPoint& kp1, const KeyPoint& kp2 )
         float triangleAreaB = b_2 * sinAlpha * cosAlpha;
 
         float intersectionArea = segmentAreaA + segmentAreaB - triangleAreaA - triangleAreaB;
-        float unionArea = (a_2 + b_2) * M_PI - intersectionArea;
+        float unionArea = (a_2 + b_2) * CV_PI - intersectionArea;
 
         ovrl = intersectionArea / unionArea;
     }
-- 
2.7.4