fixed compile error on VS2008

f6c8e237 · Maria Dimashova · 5e84ab02 · f6c8e237
Commit f6c8e237 authored Jul 30, 2010 by Maria Dimashova
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keypoint.cpp modules/features2d/src/keypoint.cpp +1 -1

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--- 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;
    }