[Insight-users] [ITK Community] ITKV4 combine affine transform with displacement field to output displacement field

[Matt McCormick]

Hi Emma,

Instead of creating a DisplacementField, writing the
CompositeTransform directly would preserve more information. It would
need to be verified, but the ".mat" or ".h5" formats instead of ".txt"
may need to be used when writing the transform to file.

Hope this helps,
Matt

On Wed, Jan 29, 2014 at 5:56 AM, Emma Saunders
<emmasaunders123 at gmail.com> wrote:
> Hi Matt, thanks for your help.
>
> To do this I must therefore load my displacement field as a transform and
> use
>
>  CompositeTransform->AddTransform(affine);
>   CompositeTransform->AddTransform(DisplacementFieldTransform);
>
> How can I then write this out as a deformation field?
>
>
> Would you then suggest using    #include
> "itkTransformToDisplacementFieldSource.h" ?
>
> Thanks
>
> Emma
>
>
>
> On Tue, Jan 28, 2014 at 8:11 PM, Matt McCormick <matt.mccormick at kitware.com>
> wrote:
>>
>> Hi Emma,
>>
>> In ITKv4, there is a much nicer way of doing this with the
>> CompositeTransform [1].  Load the AffineTransform and
>> DisplacementFieldTransform and add them to a CompositeTransform with
>> AddTransform() [2].
>>
>> Hope this helps,
>> Matt
>>
>> [1] http://www.itk.org/Doxygen/html/classitk_1_1CompositeTransform.html
>>
>> [2]http://www.itk.org/Doxygen/html/classitk_1_1MultiTransform.html#a698cf2434061a797bca49ed32a46cab9
>>
>> On Tue, Jan 28, 2014 at 3:02 PM, Emma Saunders
>> <emmasaunders123 at gmail.com> wrote:
>> > Hi all,
>> >
>> > I have an affine transform as a .txt file and a deformation field as
>> > .mha.
>> > I would like to find a composite transform of each.
>> >
>> > At the moment I convert the affine to a deformation field using
>> > "itkTransformToDisplacementFieldSource.h"
>> >
>> > and then compose it with the displacement field using:
>> >
>> > "itkComposeDisplacementFieldsImageFilter.h"
>> >
>> > Is there a more succinct way to do this in the new framework>
>> >
>> > Many thanks
>> >
>> > Emma
>> >
>> >
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