/// <summary>
 /// Obtain the keypoints array from OclMat
 /// </summary>
 /// <param name="src">The keypoints obtained from DetectKeyPointsRaw</param>
 /// <param name="dst">The vector of keypoints</param>
 public void DownloadKeypoints(OclMat <float> src, VectorOfKeyPoint dst)
 {
     OclInvoke.oclSURFDownloadKeypoints(_ptr, src, dst);
 }