[AstroPy] Interested in a wavelet toolbox?

[James Turner]

> I agree with Ricky here … a good wavelets toolbox belongs in Scipy because it’s
> useful to many scientist and engineers.

Should it be a scikit? Last I heard there was quite a lot of
resistance to adding new stuff to the SciPy core and the
expectation was that code in development would at least start
off as a scikit (but I haven't really been following the list
of late).

   https://scikits.appspot.com/about
   https://scikits.appspot.com/scikits

It seems like the only requirements are to name it something
like scikit-wavelets, put it on PyPI and use an OSI-approved
licence, so a package could *probably* be both a scikit and an
AstroPy affiliated package at the same time (whether that
makes sense if it eventually gets folded into scipy is another
matter)...

There's also bound to be some interest in this from the rather
active scikit-image community, who could probably help with
maintenance or even incorporate it there. There was some
discussion here recently about sharing code between AstroPy &
scikit-image but I can't remember the conclusion regarding
what should depend on what.

It definitely seems like a good thing to have available.

Cheers,

James.


>>  There are a few wavelet-related functions in scipy.signal already, but they
>> do not work together (e.g. scipy.signal.cwt is unrelated to
>> scipy.signal.morlet) and it is not clear how they are intended to be used.  I
>> have seen scipy discussions that propose throwing all that away and starting over.
>>
>> In case they are useful, here are my notes from the search:
>>
>> ===
>> - scipy.signal.wavelet : cwt(), only Mexican hat wavelet?  Poor documentation
>>
>> - kPyWavelet : https://github.com/Cadair/kPyWavelet/
>>   Linked from http://ocgweb.marine.usf.edu/~liu/wavelet.html
>>   Few users... real interest?
>>
>> - A Practical Guide to Wavelet Analysis
>> http://paos.colorado.edu/research/wavelets/
>>   Highly cited ... no python
>>
>> - pycwt
>> https://github.com/regeirk/pycwt
>>   Explicitly based on T&C code above
>>   # Tested.  Example code has a few minor bugs, but appears to be doing the
>> right thing
>>
>> - PyCWT
>> https://github.com/Unidata/pyCWT
>>   Simple, 1 file
>>   Based on T&C
>>   # Tested. No example code, but docstrings have examples (that don't work
>> as-is)  Source code is cleaner than pycwt.  scaleogram() has some issues.
>>  Need to input scales, not frequencies...
>>
>> - ObsPy
>> http://docs.obspy.org/master/tutorial/code_snippets/continuous_wavelet_transform.html
>>
>> - PyWavelets
>> http://www.pybytes.com/pywavelets/
>>   Part of MacPorts
>>   Good documentation effort
>>   Only one developer, but 5+ years effort
>>
>> - https://github.com/aaren/wavelets
>>
>> - https://pypi.python.org/pypi/waipy
>>   Based on T&C code
>>
>> - scipy wavelet discussions:
>> https://github.com/scipy/scipy/issues?utf8=✓&q=is%3Aissue+is%3Aopen+wavelet
>> ===
>>
>> In the end I forked Unidata/pyCWT, fixed a few things and used that
>> (https://github.com/rickyegeland/pyCWT).  On a second look I decided
>> regeirk/pycwt might have been the better implementation, but the interface and
>> documentation were not the best for getting started.
>>
>> Hope this helps.
>>
>> Regards,
>> Ricky Egeland
>>
>>
>> On Apr 2, 2015, at 12:47 PM, Amara Graps <amara at konteur.com
>> <mailto:amara at konteur.com>> wrote:
>>
>>> Greetings astropy-ers,
>>>
>>> I'm proposing the development of a wavelet library in Python to a
>>> (European Commission) funding agency and I'll need beta testing
>>> of some parts. I think it would be especially great to have the
>>> library be incorporated into AstroPy after it's written and tested
>>> because the funds for maintenance would end when the project ends..
>>> yet astronomers continue to love wavelets.
>>>
>>> Some large part of my Python wavelet library would be built upon this
>>> well-established (general purpose) Matlab toolbox:
>>>
>>> http://statweb.stanford.edu/~wavelab/Wavelab_850/index_wavelab850.html
>>>
>>> Does this sound useful and interesting to this group? If it does, please
>>> reply to graps at psi.edu. I'm gathering documentation of the AstroPy user
>>> community's interest and my testing and maintenance methodology in order
>>> to help the project get funded.
>>>
>>> Thanks very much in advance!
>>>
>>> Sincerely,
>>> Amara
>>>
>>> Amara Graps, PhD
>>> Lead Researcher,  University of Latvia
>>> Astronomijas institūts, Raiņa bulvāris 19, Rīga, LV-1050, Latvia
>>> amara at lu.lv  +371 / 28853907
>>> and
>>> Senior Scientist, Planetary Science Institute (PSI, USA),
>>> Aleksandra Caka iela, 96-31,
>>> Riga, Latvia LV-1011
>>> http://www.psi.edu/about/staff/graps/graps.html
>>> graps at psi.edu  +1 / 644-6250
>>> _______________________________________________
>>> AstroPy mailing list
>>> AstroPy at scipy.org
>>> http://mail.scipy.org/mailman/listinfo/astropy
>>
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