We set u = 0, p = 0 initially, each having width andheight matching the input, then we can compute ρc = F2 −F1. Next, following Algorithm 1, we repeatedly apply theoperations in Eqs. 2-5 for a fixed number of iterations toenable the iterative optimization. To compute the divergence,we zero-pad p on the first column (x-direction) or row (ydirection) then convolve it with weights, wx, wy to computeEq. 6: