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Re: wavelet decompose

Posted by Rainer M. Engel on Nov 08, 2013; 12:27pm
URL: http://imagej.273.s1.nabble.com/wavelet-decompose-tp5005489p5005501.html

Dear Michael,

thank you for this advice. I made a quick test myself and it works as
described. The only thing that would remain, is making it truely
lossless but it's very close, as you wrote.

Best regards,
Rainer


Am 07.11.2013 17:48, schrieb Michael Schmid:

> 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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