[SciPy-Dev] question of scope wavelet code

[Helder]

Hi. I'm not expert, so this is just an opinion.

I've been studing wavelets as a 'hobby' for about six months.
My intent is to perform denoising of mammographic images using them.

In my experience reading scientific papers I see be used: curvelets,
contourlets and ridgelets.
The other ones I never heard of.

Cheers.





Att,
*Helder C. R. de Oliveira*
EESC/Universidade de São Paulo
http://helderc.github.io


On Sun, May 10, 2015 at 5:07 PM, Ralf Gommers <ralf.gommers at gmail.com>
wrote:

> Hi all,
>
> As you may know, I forked PyWavelets a while ago and with the help of
> quite a few people started bringing it up to the standards needed for
> inclusion in scipy: https://github.com/rgommers/pywt. The last year I
> haven't had too much time for it, but I'd like to get back to it. That's
> also triggered by several PRs and proposed enhancements - there's quite a
> bit of interest for a fork that never actually had a release. This proposal
> https://github.com/rgommers/pywt/issues/58) to add contourlets triggered
> me to bring up what the scope of a (discrete) wavelets module in scipy
> should be.
>
> What's there now is still mostly what's listed in
> http://pywavelets.readthedocs.org/en/latest/. A few additions are/were
> no-brainers, like n-D inverse DWT and inverse SWT (stationary wavelet
> transform). But beyond that I realize that a bit of care is needed, because
> there's a huge array of variations on wavelets. Here's a quick list of what
> I'm aware of, ordered from most to least important in my perspective:
>
> - curvelets (https://en.wikipedia.org/wiki/Curvelet)
> - contourlets (http://en.wikipedia.org/wiki/Contourlet)
> - shearlets (http://en.wikipedia.org/wiki/Shearlet http://shearlab.org
> GPL)
> - chirplets (http://en.wikipedia.org/wiki/Chirplet_transform
> http://tfd.sourceforge.net/ GPL)
> - ridgelets (
> http://rsta.royalsocietypublishing.org/content/357/1760/2495.short)
> - wedgelets (http://projecteuclid.org/euclid.aos/1018031261)
> - noiselets (http://en.wikipedia.org/wiki/Noiselet)
> - surfacelets (http://dx.doi.org/10.1109/TIP.2007.891785)
> - bandelets (http://en.wikipedia.org/wiki/Bandelet)
>
> At least the first four items in this list seem to be quite widely used.
> I'd like some opinions on which (if any) of these people think would fit in
> scipy, and which ones should rather be kept in a wavelets-specific package.
>
> Also, if anyone has experience using the contourlet toolbox under
> discussion in issue 58, would be great to hear how it performed.
>
> Ralf
>
>
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>
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