OpenCvSharp.Cv2.CalcOpticalFlowPyrLK C# (CSharp) Method

        public static void CalcOpticalFlowPyrLK(
            InputArray prevImg, InputArray nextImg,
            InputArray prevPts, InputOutputArray nextPts,
            OutputArray status, OutputArray err,
            Size? winSize = null,
            int maxLevel = 3,
            TermCriteria? criteria = null,
            OpticalFlowFlags flags = OpticalFlowFlags.None,
            double minEigThreshold = 1e-4)
        {
            if (prevImg == null)
                throw new ArgumentNullException(nameof(prevImg));
            if (nextImg == null)
                throw new ArgumentNullException(nameof(nextImg));
            if (prevPts == null)
                throw new ArgumentNullException(nameof(prevPts));
            if (nextPts == null)
                throw new ArgumentNullException(nameof(nextPts));
            if (status == null)
                throw new ArgumentNullException(nameof(status));
            if (err == null)
                throw new ArgumentNullException(nameof(err));
            prevImg.ThrowIfDisposed();
            nextImg.ThrowIfDisposed();
            prevPts.ThrowIfDisposed();
            nextPts.ThrowIfNotReady();
            status.ThrowIfNotReady();
            err.ThrowIfNotReady();

            Size winSize0 = winSize.GetValueOrDefault(new Size(21, 21));
            TermCriteria criteria0 = criteria.GetValueOrDefault(
                TermCriteria.Both(30, 0.01));

            NativeMethods.video_calcOpticalFlowPyrLK_InputArray(
                prevImg.CvPtr, nextImg.CvPtr, prevPts.CvPtr, nextPts.CvPtr,
                status.CvPtr, err.CvPtr, winSize0,maxLevel,
                criteria0, (int)flags, minEigThreshold);

            nextPts.Fix();
            status.Fix();
            err.Fix();
        }
        /// <summary>