Finding Out the Fourier and Inverse Fourier Transform of an Image

A = [ 0 0 0 0 0 0 0 0;

         0 0 0 0 0 0 0 0;

         0 0 0 1 1 0 0 0;

         0 0 0 1 1 0 0 0;

         0 0 0 1 1 0 0 0;

         0 0 0 1 1 0 0 0;

         0 0 0 0 0 0 0 0;

         0 0 0 0 0 0 0 0]

iptsetpref('ImshowTruesize','manual') figure;

subplot(3,2,1); imshow(A); title('Original Image');

subplot(3,2,2); mesh(A); title('Mesh Plot of Original Image');

B = fft2(A);

subplot(3,2,3); imshow(B); title('2-D FFT of Original Image');

subplot(3,2,4); mesh(B); title('Mesh Plot of 2-D FFT');

C = ifft2(B);

subplot(3,2,5); imshow(C); title('Inv 2-D FFT of Above Image');

subplot(3,2,6); mesh(C); title('Mesh Plot of Inv 2-D FFT');