Re: wavelet decompose

Posted by Michael Schmid on Nov 07, 2013; 4:48pm
URL: http://imagej.273.s1.nabble.com/wavelet-decompose-tp5005489p5005490.html

Hi Rainer,

there is an alternative to wavelets: Simply do a bandpass filter in the Fourier transform.

With Process>FFT>Bandpass filter (suppress stripes=none, all autoscaling off) I have tried decomposing an image into three bands, 0-3, 3-40 and 40-400000 wavelength bands.
(for a small image, 400000 is close to infinity; I think that the program does not accept infinity here).

Then I have added these three contributions. Apart from a constant offset (which means one should to do the calculations on float images), the result was very close to the original (0.3% of the maximum pixel value or so).

Michael
________________________________________________________________
On Nov 7, 2013, at 13:54, Rainer M. Engel wrote:

> I'm searching for something like this but for ImageJ.
> http://registry.gimp.org/node/11742
>
> Thanks for your help.
>
> Regards,
> Rainer
>
> --
> Rainer M. Engel, Dipl. Digital Artist
> scientific|Media GbR
> Pichelsdorfer Str. 143
> 13595 Berlin
>
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> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

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