Re: 2D FFT
- From: Richard Owlett <rowlett@xxxxxxxxxxxxx>
- Date: Mon, 02 Feb 2009 08:47:07 -0600
illywhacker wrote:
On Feb 2, 11:04 am, "cherriegeller" <cherrie.gel...@xxxxxxxxx> wrote:
Could someone please explain the concept of 2D FFT in more layman terms?
Most if not all the resources i read about 2D FT for image processing are
loaded with lots of mathematical formulaes which I believe are important,
but have problems understanding. I just want a basic conceptual idea about
the technique before using some freeware to compute the 2D FT of a brain
image.
Why don't you start with the 1D FFT? Do you understand that? Or, to
paraphrase an old joke, first understand the FFT in N dimensions, and
then set N = 2.
illywhacker;
I'm another that has no feel for a 2D Fourier Transform (discrete OR continuous). In the "1D" case we can build on a demonstration of how only odd harmonics of a sine wave can be added to approach a square wave. Is there a similar demo for the "2D" case?
For example I have a gut feeling that a 2D transform of elevation data in the region of the San Andreas Fault or the Great Rift Valley would show a prominent feature. But what vector space would it be in?
.
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