Separable Transform: 2-D FFT

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% Note: only part of the code are shown here, look at the original M file to check out details

% ----------- Section 2: FFT --------------------------------------
% intuition on image transform 
% example: natrual image:   lena and lowlibrary
% and artificial image:     stripes

% 1. Bright Dot in the center <-----> DC componet <-----> low pass characteristics of image:
% 2. Any idea what does the slant lines mean?
% (continue ...)

% Back to 1-D case
% Step function <---> Sinc


% look at the stripes again:

% Take a non-trivial example:

% Architects often talk about the balance between horizontal and vertical lines

% Now see how this is true in frequency domain
% Take part of this image (256x256), do 2-D FFT

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