bsp;void&nbsp;calcOpticalFlowFarneback(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;prev,
                                            <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;next,
                                            <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;flow,
                                            double&nbsp;pyr_scale,
                          