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From: Saied on 26 Jun 2010 13:45
hey every one,here is my problem,I found a code which doing the following to an image
fftshift(fft2(image))
then he apply Gaussian high pass filter
then he make
iffshift(fft2(image))
I want to understand why he makes fftshift and fft2.I would like to see a link explains that as well if you can,and I would appreciate any explains here too.
Thanks every one :).
From: us on 26 Jun 2010 14:01
"Saied " <kezman_100(a)yahoo.com> wrote in message <i05eb2$7q$1(a)fred.mathworks.com>...
> hey every one,here is my problem,I found a code which doing the following to an image
> fftshift(fft2(image))
> then he apply Gaussian high pass filter
> then he make
> iffshift(fft2(image))
> I want to understand why he makes fftshift and fft2.I would like to see a link explains that as well if you can,and I would appreciate any explains here too.
> Thanks every one :).

a hint:
- peruse the many docs on this matter, eg

cleve moler's exposee

http://www.mathworks.com/moler/fourier.pdf

tmw's help system, eg,

http://www.mathworks.com/access/helpdesk/help/techdoc/math/brentm1-1.html

us
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