%show2DFourier.m

imageName = 'habitat.jpg';
I = double(imread(imageName));
sizeI = size(I);
numRows = sizeI(1);
numCols = sizeI(2);
Ig = squeeze(I(:,:,2));
imagesc(-numRows/2+1:numRows/2, -numCols/2+1:numCols/2, log(abs(fftshift(fft2(Ig)))));
colormap gray
axis square