[Insight-users] Re: Cartesian to polar filter in ITK

[Jakub Bican]

The contribution referenced by Moti will help you to transform image between
cartesian and polar (generally multidimensional cylindrical) coordinates.
You need to use these transforms with ResampleImageFilter to compute the
transformation (see ITK Software Guide section 6.9.4 Resample Image Filter).
Note, that to transform image from cartesian to polar coordinates, you need
to use PolarToCartesianTransform, because ITK is using transforms to map
points from output space to input space. If you have any problems or
questions, feel free to ask me.

Unfortunately, these transforms do only polar mapping. If you need to make
log-polar mapping, i can assist you to write your own transform.

Jakub


2007/1/22, Kuba Bican <kuba at smyslzivota.cz>:
>
>
> The contribution referenced by Moti will help you to transform image
> between cartesian and polar (generally multidimensional cylindrical)
> coordinates. You need to use these transforms with ResampleImageFilter to
> compute the transformation (see ITK Software Guide section 6.9.4 Resample
> Image Filter). Note, that to transform image from cartesian to polar
> coordinates, you need to use PolarToCartesianTransform, because ITK is using
> transforms to map points from output space to input space. If you have any
> problems or questions, feel free to ask me.
>
> Unfortunately, these transforms do only polar mapping. If you need to make
> log-polar mapping, i can assist you to write your own transform.
>
> Jakub
>
>
>
> 2007/1/21, Moti Freiman < freiman at cs.huji.ac.il>:
> >
> > This link might interest you.
> > http://insight-journal.org/dspace/handle/1926/342
> > However I did not tested it by my self.
> > Good luck,
> > Moti
> >
> >
> > > ------------------------------
> > >
> > > Message: 2
> > > Date: Sun, 21 Jan 2007 02:27:44 +0000
> > > From: Ali - <saveez at hotmail.com>
> > > Subject: [Insight-users] Cartesian to polar filter in ITK
> > > To: ITK < insight-users at itk.org >
> > > Message-ID: <BAY122-W15CFD43CF235B3C8E0422ED1AF0 at phx.gbl>
> > > Content-Type: text/plain; charset="iso-8859-1"
> > >
> > > Hi,I am trying to 'map' the pixels of images in Cartesian to polarand
> > > log-polar coordinates. By 'mapping' I mean the whole imageintensity is
> > > needed to be redistributed. For example image of a circle in Cartesian must
> > > be mapped to an image of a square in polarspace. This needs the
> > > implementation of an image-to-image filter.Is such a filter already
> > > available in ITK? If not, which filter is the closest one to start with?
> > > (The Hough transform?)
> > > _________________________________________________________________
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> > >
> > > -
> >
> >
> > --
> > __
> > Moti Freiman, Ph.D Student.
> > Medical Image Processing and Computer-Assisted Surgery Laboratory.
> > School of Computer Science and Engineering.
> > The Hebrew University of Jerusalem Givat Ram, Jerusalem 91904, Israel
> > Phone: +(972)-2-658-5371 (laboratory)
> > WWW site: http://www.cs.huji.ac.il/~freiman<http://www.cs.huji.ac.il/%7Efreiman>
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
> >
> >
>
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