Index: H:/OpenCVWorkspace/OpenCV2.2_Learn/include/opencv2/imgproc/imgproc.hpp
===================================================================
--- H:/OpenCVWorkspace/OpenCV2.2_Learn/include/opencv2/imgproc/imgproc.hpp	(revision 30)
+++ H:/OpenCVWorkspace/OpenCV2.2_Learn/include/opencv2/imgproc/imgproc.hpp	(revision 31)
@@ -828,6 +828,8 @@
 //! returns true iff the contour is convex. Does not support contours with self-intersection
 CV_EXPORTS_W bool isContourConvex( const Mat& contour );
 
+CV_EXPORTS_W void ConvexityDefects( const Mat& points, const vector<int>& hull, vector<CvConvexityDefect> &defects );
+
 //! fits ellipse to the set of 2D points
 CV_EXPORTS_W RotatedRect fitEllipse( const Mat& points );
 
Index: H:/OpenCVWorkspace/OpenCV2.2_Learn/modules/imgproc/src/contours.cpp
===================================================================
--- H:/OpenCVWorkspace/OpenCV2.2_Learn/modules/imgproc/src/contours.cpp	(revision 30)
+++ H:/OpenCVWorkspace/OpenCV2.2_Learn/modules/imgproc/src/contours.cpp	(revision 31)
@@ -1744,6 +1744,24 @@
     return cvCheckContourConvexity(&c) > 0;
 }
 
+void cv::ConvexityDefects( const Mat& points, const vector<int>& hull, vector<CvConvexityDefect> &defects )
+{
+	int nelems = points.checkVector(2, CV_32S);
+	int nhelems = (int)hull.size();
+    if (nelems < nhelems)
+	{
+		defects.clear();
+		return;
+	}
+	
+	// convert to CvMat (C API)
+	CvMat _points = Mat(points), _hull=Mat(hull);
+	// allocate storage for the defects
+	MemStorage storage(cvCreateMemStorage());
+    Seq<CvConvexityDefect> defectSeq( cvConvexityDefects(&_points, &_hull, storage) );
+	defectSeq.copyTo(defects);
+}
+
 cv::RotatedRect cv::fitEllipse( const Mat& points )
 {
     CV_Assert(points.checkVector(2) >= 0 &&