cvConvexHull2() 함수의 사용 CvSeq* cvConvexHull2( const CvArr* input, void* hull_storage=NULL, int orientation=CV_CLOCKWISE, int return_points=0 ); points Sequence or array of 2D points with 32-bit integer or floating-point coordinates. hull_storage The destination array (CvMat*) or memory storage (CvMemStorage*) that will store the convex hull. If it is array, it should be 1d and have the same numbe..