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Topic: fk-filter, velocity filter, frequency-wavenumber filter
Replies: 9   Last Post: Mar 12, 2010 4:44 PM

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Rune Allnor

Posts: 4,455
Registered: 12/7/04
Re: fk-filter, velocity filter, frequency-wavenumber filter
Posted: Mar 11, 2010 11:02 AM
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On 11 Mar, 16:47, "Hans " <> wrote:
> That would mean for me the need to look deeper into the way, how a 2-D Filter is defined in Matlab.

There is no such thing as a '2D filter' in matlab. Only
matrices. You are looking for something as simple as

y = real(ifft2(fft2(x).*H));

where x is your time-space data, H is your fk filter,
and y is the filtered data.

The 'hard' part is to fill in the numbers in H. You can
do that in a couple of minutes, once you have some sort
of idea what you want the filter to do.

Coming up with that idea is hard, though, as it requires
you to actually contemplate what you are up to, rather than
fiddling with ready-made software routines.


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