how do i simulate a 4f correlator

Question

eden london 2016-6-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/288789-how-do-i-simulate-a-4f-correlator

回答： eden london 2016-6-9

im trying to simulate a 4f correlator, and for some reason i cant get it to work. The code that simulates the 4f correlator is this:

     [xgrid ygrid]=meshgrid(1:1024);
     grid=(xgrid-512).^2 +(ygrid-512).^2;
     lens=exp((1i*pi*(pixsize^2)/((-f)*w)).*grid);
     move=fft2(exp((1i*pi*(pixsize^2)/(f*w)).*grid));
    img=padarray(h1cof,[pf pf]);
    bl1=ifftshift(ifft2(fft2(img).*move));
    al1=bl1.*lens;
    bh2=ifftshift(ifft2(fft2(al1).*move));
    ah2=bh2.*padarray(h2ft,[pf pf]);
    bl2=ifftshift(ifft2(fft2(ah2).*move));
    al2=bl2.*lens;
    rescof=ifftshift(ifft2(fft2(al2).*move));