opencv - Mapping frames based on motion -

i need create 3 intermediate frames between 2 frames (previmg, nextimg), have found out motion of each pixel using calcopticalflowfarneback() function in opencv

  calcopticalflowfarneback(gray1, gray2, flow, pyrscale, pyrlevel, winsize,                            iter, polyn, sigma, method); 

then have created 3 intermediate frames calling function createnewframe(), following shift (func. argument) values 0.25, 0.5, 0.75

void createnewframe(mat & frame, const mat & flow, float shift, int & c, mat & prev, mat &next) {   (int y = 0; y < mapx.rows; y++)   {     (int x = 0; x < mapx.cols; x++)     {       point2f f = flow.at<point2f>(y, x);       mapx.at<float>(y, x) =  x + f.x/shift;       mapy.at<float>(y, x) =  y + f.y/shift;     }   }   remap(frame, newframe, mapx, mapy, inter_linear); } 

but not getting proper intermediate frames.. transition 1 frame other non smooth (flickering). problem in code ? need proper intermediate frames ? ?

i think should multiplying variable shift, not dividing it.

try replacing double loop in function createnewframe following one:

  (int y = 0; y < mapx.rows; y++)   {     (int x = 0; x < mapx.cols; x++)     {       point2f f = flow.at<point2f>(y, x);       mapx.at<float>(y, x) =  x + f.x*shift;       mapy.at<float>(y, x) =  y + f.y*shift;     }   }