[Insight-users] suppress shearing

[Luis Ibanez]

Hi Erik,

A transform that allows for rotation and for anisotropic scaling
is indirectly allowing for Skewing (or Shearing).

In short,
it is a transform that does not preserve the angles
between two straight lines.


In that case, the Affine Transform is what you need.


However,
you may want to look at the

                  itkScaleSkewVersor3DTransform

http://public.kitware.com/Insight/Doxygen/html/classitk_1_1ScaleSkewVersor3DTransform.html


Just in case
your definition of "shearing" is a bit more specific....



     Regards,


           Luis



--------------------------------------------------------------------------------
On Fri, Apr 9, 2010 at 10:32 AM, Erik Tuerke <tuerke at cbs.mpg.de> wrote:

> Hi!
>
> Thanks for the reply!
>
> Unfortunately i can not rely on an isotropic scaling. Sometimes it will be
> enough, but the best would be to apply an anisotropic scaling.
>
> cheers
>
> ----- Original Message -----
> From: "Bill Lorensen" <bill.lorensen at gmail.com>
> To: "Erik Tuerke" <tuerke at cbs.mpg.de>
> Cc: "insight-users" <insight-users at itk.org>
> Sent: Friday, April 9, 2010 2:52:51 PM GMT +01:00 Amsterdam / Berlin / Bern
> / Rome / Stockholm / Vienna
> Subject: Re: [Insight-users] suppress shearing
>
> itkSimiliarity2DTransform and itkSimilarity3DTransform ally rotation,
> translation and isotropic scaling.
>
> Is your scaling isotropic?
>
> On Fri, Apr 9, 2010 at 4:39 AM, Erik Tuerke <tuerke at cbs.mpg.de> wrote:
> > Ahh...sorry for the double post but i am used to push strg-s to save a
> text but unfortunately this is assigned to sent.
> >
> > anyway...
> >
> > I am seeking a transform which is capable of applying a transformation in
> a way of translation, rotation and scaling.
> > Since i did not found such a transform, i thought taking the affine
> transform and suppress the shearing.
> > Is there any way to do so? Maybe setting the optimizer scale to 0 for the
> respective parameters...but what are the shearing parameters?
> >
> > Thanks!
> >
> > --
> > Erik Türke
> > Department of Neurophysics
> > Max-Planck-Institute for Human Cognitive and Brain Sciences
> > Stephanstrasse 1A
> > 04103 Leipzig
> > Germany
> > Tel: +49 341 99 40-2440
> > Email: tuerke at cbs.mpg.de
> > www.cbs.mpg.de
> >
> >
> > _____________________________________
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>
> --
> Erik Türke
> Department of Neurophysics
> Max-Planck-Institute for Human Cognitive and Brain Sciences
> Stephanstrasse 1A
> 04103 Leipzig
> Germany
> Tel: +49 341 99 40-2440
> Email: tuerke at cbs.mpg.de
> www.cbs.mpg.de
>
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users
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