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Please help me understand this
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 :).
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 Saied
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6/26/2010 5:45:06 PM |
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"Saied " <kezman_100@yahoo.com> wrote in message <i05eb2$7q$1@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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 us1 (8054)
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6/26/2010 6:01:05 PM
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