How to perform 2 dimensional circular convolution

Question

Palguna Gopireddy 2022-3-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665734-how-to-perform-2-dimensional-circular-convolution

评论： Palguna Gopireddy 2022-3-10

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.

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Answer 1

Matt J 2022-3-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1665734-how-to-perform-2-dimensional-circular-convolution#answer_912114

在 MATLAB Online 中打开

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');