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Obtain a periodic convolution matrix for 2D signal

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Following matlab code generates a periodic convolution matrix for 1D case. Can somebody tell me the way to generate the matrix for 2D case?
In the following, s is a 1D signal and g is a 1D kernel. I want to generate the convolution matrix when s is a 2D signal.
%h=ifft(fft(s).*fft(g));
h_mat=ifft(fft(eye(length(s))).*fft(g));
%h1 = h_mat*s;

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R2018a

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