How to perform 2 dimensional circular convolution

We have 'conv' and 'conv2' functions in matlab to find 1-D and 2-D linear convolution.

But for circular convolution we have only 'cconv' for 1-D convolution. Is there 2-D circular convolution function in matlab or there is any way to acheive 2-D circular convolution in MATLAB.

I tried using 'conv2(A,B,'same'), but it is not same as 2-D circular convolution.

Answer 1

[Matt J]

function z=cyconv(x,y)
%Non-Fourier domain cyclic convolution
%
%  z=cyconv(x,y)

 siz=num2cell(size(x));

 subs=cellfun(@(n)[2:n,1:n],siz,'uni',0);

 x=x(subs{:});

 z=convn(x,y,'valid');

[Palguna Gopireddy]

Thank you so much.

Answer 2

[Matt J]

Using FFTs

out = ifft2(fft2(A).*fft2(B));