[Insight-users] Polar transforms

[Jakub Bican]

Hi Luis,

here is my contribution to ITK. There are 4 classes - polar transform
(forward and reverse), permute axes transform and "compose transforms"
transform - what they should do is descibed in former mails (below).

Tests to all the classes are attached.

I added my authorship credits to doxygen \author tag to documentation of
each class.

It would be nice to review the classes: i am quite new to ITK so i am not
sure whether i followed all ITK's good habits and standards, etc. It is not
necessary, but i suppose that it will ensure usefulness of classes for other
users and prevent contribution of useless or bad code.

Please, feel free to change anything neccessary - e.g. class names, docs,
implementation, tests, .. anything :). Just let me know.


Cheers,

            Jakub Bican



----- Original Message ----- 
From: "Luis Ibanez" <luis.ibanez at kitware.com>
To: "Jakub Bican" <jakub.bican at matfyz.cz>
Cc: <insight-users at itk.org>
Sent: Thursday, May 19, 2005 5:39 PM
Subject: Re: [Insight-users] Polar transforms


>
>
> Hi Jakub,
>
>
> Thanks for your willingness to contribute your code to ITK.
>
> We will be happy to add your transform to the toolkit.
>
> Could you please send us the files (.h and .txx) along with
> a test for this transform.  The test should exercise all the
> methods of the new class.
>
> Please let us know too how do you want the credits for authorship
> to be listed in the header file.  Typicall we follow the Doxygen
> format of:
>
>
>    \author John Doe, Department of Surgery, University of Zion
>
>
>
>    Thanks
>
>
>       Luis
>
>
>
> ---------------------
> Jakub Bican wrote:
>
> >
> > Hi all,
> >
> > i am implementing a multidimensional polar transform. It transforms
> > first two dimensions of cartesian space into <angle,radius> coordinates,
> > leaving the other dimensions unchanged (i.e. - multidimensional
> > cylindric transform). I have implemented both forward and backward
> > transforms. To transform space to cylinder in general position (to
> > transform other than first two dimensions), it is neccessary to
> > transform the image first by for example Euler3DTransform, or
> > PermuteAxesImageFilter. To avoid excess memory and time, i implemented
> > PermuteAxesTransform, which does the same as the filter, but it is a
> > transform.
> >
> > Now i have two possibilities what to do:
> > 1) imlement something like "bulk transform" as it is in
> > BSplineDeformableTransform into the polar transforms, or
> >
> > 2) implement general "ComposeTransformsTransform", which keeps a queue
> > of transforms and successively transforms points and vectors by all of
> > them. So it is possible to do several transforms in just one
> > ResampleImageFilter.
> >
> > I find the second solution more laborious but principally much more
> > useful. But before i will do it, i need to know surely, if there is not
> > such class in ITK yet, because i did not find it and i think that it is
> > really useful and it should be implemented. Or is there any other way
> > how to pass several transforms into one ResampleImageFilter??
> >
> > I also found AzimuthElevationToCartesianTransform class in ITK. This
> > does a kind of spheric transform and i must say that it is implemented
> > badly. It uses several parameters to "sample" the "polar" space once
> > more. All these parameters are redundant to properly set Size, Spacing
> > and Origin parameters of ResampleImageFilters output and only comlicates
> > the situation. Keeping in mind that transforms are transforming "real"
> > coordinates, such transforms as polar, cylindric or spheric do not need
> > any parameters. Everything is just question of proper sampling of input
> > and output space.
> >
> > Finally, i found several requests for polar transforms in insight-users
> > archives, so if it is still open and if it is possible, i would be
> > pleased to submit my classes into ITK.
> >
> > Regards
> > Jakub
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
>
>
>
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