241                 int qx0 = x + dx;  in operator ()()  local
244                 if (qy0 >= 0 && qy0 < mask0.rows && qx0 >= 0 && qx0 < mask0.cols && mask0(qy0,qx0))  in operator ()()
246                     int qx1 = cvRound(qx0 + flowX(qy0,qx0));  in operator ()()
247                     int qy1 = cvRound(qy0 + flowY(qy0,qx0));  in operator ()()
256                         if (qx0 > 0 && mask0(qy0,qx0-1))  in operator ()()
258                             if (qx0+1 < mask0.cols && mask0(qy0,qx0+1))  in operator ()()
260                                 dudx = (flowX(qy0,qx0+1) - flowX(qy0,qx0-1)) * 0.5f;  in operator ()()
261                                 dvdx = (flowY(qy0,qx0+1) - flowY(qy0,qx0-1)) * 0.5f;  in operator ()()
265                                 dudx = flowX(qy0,qx0) - flowX(qy0,qx0-1);  in operator ()()
266                                 dvdx = flowY(qy0,qx0) - flowY(qy0,qx0-1);  in operator ()()
269                         else if (qx0+1 < mask0.cols && mask0(qy0,qx0+1))  in operator ()()
271                             dudx = flowX(qy0,qx0+1) - flowX(qy0,qx0);  in operator ()()
272                             dvdx = flowY(qy0,qx0+1) - flowY(qy0,qx0);  in operator ()()
275                         if (qy0 > 0 && mask0(qy0-1,qx0))  in operator ()()
277                             if (qy0+1 < mask0.rows && mask0(qy0+1,qx0))  in operator ()()
279                                 dudy = (flowX(qy0+1,qx0) - flowX(qy0-1,qx0)) * 0.5f;  in operator ()()
280                                 dvdy = (flowY(qy0+1,qx0) - flowY(qy0-1,qx0)) * 0.5f;  in operator ()()
284                                 dudy = flowX(qy0,qx0) - flowX(qy0-1,qx0);  in operator ()()
285                                 dvdy = flowY(qy0,qx0) - flowY(qy0-1,qx0);  in operator ()()
288                         else if (qy0+1 < mask0.rows && mask0(qy0+1,qx0))  in operator ()()
290                             dudy = flowX(qy0+1,qx0) - flowX(qy0,qx0);  in operator ()()
291                             dvdy = flowY(qy0+1,qx0) - flowY(qy0,qx0);  in operator ()()
300                         uEst += w * (flowX(qy0,qx0) - dudx*dx - dudy*dy);  in operator ()()
301                         vEst += w * (flowY(qy0,qx0) - dvdx*dx - dvdy*dy);  in operator ()()