.</p>  *  * @see <a href="http://docs.opencv.org/modules/video/doc/motion_analysis_and_object_tracking.html#buildopticalflowpyramid">org.opencv.video.Video.buildOpticalFlowPyramid</a>  */     public static int buildOpticalFlowPyramid(Mat img, List<Mat> pyramid, Size winSize, int maxLevel, boolean withDerivatives, int pyrBorder, int derivBorder, boolean tryReuseInputImage)     {         Mat pyramid_mat = new Mat();         int retVal = buildOpticalFlowPyramid_0(img.nativeObj, pyramid_mat.nativeObj, winSize.width, winSize.height, maxLevel, 