相位恢復算法

有會相位恢復算法的嗎？能幫我看看下面的代碼錯哪兒了嗎？不勝感激

2d centered Fourier transform，居中的傅里葉變換
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Citation for this code and algorithm:
% Tatiana Latychevskaia and Hans-Werner Fink
% "Practical algorithms for simulation and reconstruction of digital in-line holograms",
% Appl. Optics 54, 2424 - 2434 (2015)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% The code is written by Tatiana Latychevskaia, 2002
% The version of Matlab for this code is R2010b

function [out] = FT2Dc(u0);

[Nx, Ny] = size(1i,1j);

f1 = zeros(Nx,Ny);

for ii = 1:Nx