[Insight-developers] compose affine with header filter?

[Michael Stauffer (Circular Logic)]

We're not interested in shearing (at least at this point, Brian might
have some ideas about that for down the road). Initially we'd like to be
able to orient sets of images to a common orientation before batch
processing, so should need just rotation and/or reflection. The idea, if
I understand fully, is to account for different orientations between or
within data sets, possibly due to operator error. Thus, we'll probably
have to manually set the transforms per image.

The goal with doing this via the image header is to avoid preprocessing
the image data itself and introducing unnecessary interpolation noise.

It seems from what we've looked at so far that the Image::m_Direction
matrix is expected to be rigid, and if it is not, it is decomposed to
use only the rigid part? At least, this seems to be how itk snap
behaves.

Cheers,
M

>-----Original Message-----
>From: cquammen at gmail.com [mailto:cquammen at gmail.com] On Behalf 
>Of Cory Quammen
>Sent: Friday, October 08, 2010 1:10 PM
>To: Michael Stauffer (Circular Logic)
>Cc: Insight Developers
>Subject: Re: [Insight-developers] compose affine with header filter?
>
>Hi Michael,
>
>I don't know of a filter that does what you describe, but it sounds
>like you want this filter to essentially produce an image on a
>potentially sheared grid. Does this correctly characterize what you
>want the filter to produce?
>
>An image defined on a sheared grid fits in with a recent discussion on
>this list about supporting images whose samples do not lie at regular
>intervals along orthogonal directions, so I'm interested in knowing
>more about what you are trying to do with this filter.
>
>Thanks,
>Cory
>
>
>On Fri, Oct 8, 2010 at 11:28 AM, Michael Stauffer (Circular Logic)
><mstauff at verizon.net> wrote:
>> Hi all,
>>
>> I'm new to ITK. I started working with Brian Avants and the 
>reset of the
>> ANTS team a few weeks ago. I'm about to start on my first 
>ITK filter, a
>> simple one to learn the ropes. It may or may not end up being useful.
>> But first we wanted to check if someone else has already 
>implemented the
>> follow functionality, but not integrated it with itk.
>>
>> The filter will accept an image and an affine transform, compose the
>> input transform with the transform stored in the image's header (via
>> m_Direction and m_Origin), then output a new image with the composed
>> transform in its header.
>>
>> Cheers,
>> Michael
>>
>> _______________________________________________
>> 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://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-developers
>>
>
>
>
>-- 
>Cory Quammen
>Computer Integrated Systems for Microscopy and Manipulation (CISMM)
>Department of Computer Science
>University of North Carolina at Chapel Hill
>http://www.cs.unc.edu/~cquammen