[Insight-users] [ITK Community] 4x4 matrix to itkTransform

[Matt McCormick]

Hi Vikash,

The Transform of interest can be instantiated and then its values set
with the "SetParameters" method.  See the transform code for order.
For an affine transform like the one referenced, note that it is
typically stored as affine matrix + translation, eliminating the need
for the "0 0 0 1" in the bottom row.  There is also often a center of
rotation that is stored.

The transform can then be written to file with the
TransformFileWriterTemplate class [1]

Hope this helps,
Matt

[1] http://www.itk.org/Doxygen/html/classitk_1_1TransformFileWriterTemplate.html

On Tue, Jan 28, 2014 at 1:27 PM, Vikash Gupta <vikash.gupta at inria.fr> wrote:
> Hey everyone
> I am little bit lost like if there is a tool that exist that will convert a
> 4x4 matrix to a ITKTransform type
>
> For example, essentially
> input format
>
> 0.990242  0.0089482  0.0115564  -55.2129
> -0.00411503  0.978607  0.0120489  -60.1255
> -0.00965018  -0.00686595  0.979628  74.2065
> 0  0  0  1
>
> Output
> #Insight Transform File V1.0
> # Transform 0
> Transform: AffineTransform_double_3_3
> Parameters: -0.997192 0.0283671 -0.0693022 0.0158514 0.984462 0.174879
> -0.0731862 -0.173289 0.982148 -0.206132 -33.1051 7.77696
> FixedParameters: 0 0 0
>
>
> Any help  would be really appreciated.
>
> Thanks
> Vikash
>
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