Re: Frequency Filtering in Time Dimension?

Posted by Herbie on Oct 30, 2018; 2:15pm
URL: http://imagej.273.s1.nabble.com/Frequency-Filtering-in-Time-Dimension-tp5021367p5021373.html

Jacob,

I must admit that using "*Array.fourier" won't help because it doesn't deal
with complex-valued signals. (I wasn't aware of this fact.)

Consequently, you need to follow one of Michael's suggestions.

Good luck

Herbie

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Good day Jacob,

if you mean point-wise filtering in time this can of course be done either
by 1D-convolution or 1D-FFT. The latter is made easy by the following macro
command:

*Array.fourier(array, windowType)*
Calculates and returns the Fourier amplitudes of array. WindowType can be
"none", "Hamming", "Hann", or "flat-top", or may be omitted (meaning
"none"). See the TestArrayFourier macro for an example and more
documentation. Requires 1.49i.

HTH

Herbie

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Jacob Keller-2 wrote

> Hi All,
>
> is there a way to do high-pass/low-pass filtering in the time dimension?
> Or
> a suggestion for a workaround?
>
> All the best,
>
> Jacob Keller
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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