cvConvexHull2    1154 modules/calib3d/src/calibinit.cpp             CvSeq *hull = cvConvexHull2( &pointMat, temp_storage, CV_CLOCKWISE, 1 );
cvConvexHull2     570 modules/imgproc/include/opencv2/imgproc/imgproc_c.h CVAPI(CvSeq*) cvConvexHull2( const CvArr* input,
cvConvexHull2     505 modules/imgproc/test/test_convhull.cpp         hull1 = cvConvexHull2( points, hull_storage, orientation, return_points );