[Insight-developers] reading Image<Matrix> as Image<SymmetricSecondRankTensor>

[Luis Ibanez]

Hi Matt,

Thanks for looking into this problem.

I'm a bit confused about what you suggest in your email.

Are you suggesting to change the test
in order to also exercise a 2D case ?

or is it the core of the change, to use an image of
SymmetricSecondRankTensor instead of Matrix2x2
as the source for the image ?

Also, have you identified the changes that we will
have to introduce in the Writer/Reader in order to
get this test to pass ?


Could you please clarify ?


    Thanks


          Luis


----------------------------------------------------------
On Sun, Jun 13, 2010 at 12:38 AM, Matthew McCormick (thewtex) <
matt at mmmccormick.com> wrote:

> Hi,
>
> I am working on adding 2D SymmetricSecondRankTensor image write support.
> The bug is here.
> http://vtk.org/Bug/view.php?id=10732
>
> In order to add a test for the bug, I was thinking of modifying
> Testing/Code/IO/itkSymmetricSecondRankTensorImageReadTest.cxx
>
> Currently, this test creates an Image of 3x3 itk::Matrix, writes it to
> file, reads it in as an Image of SymmetricSecondRankTensor's, and checks to
> ensure the content is the same.
>
> If I try to do the same with 2x2 itk::Matrix, the SymmetricSecondRankTensor
> reader does not read the correct components:
> 941: Test command: /mnt/datab/itkcvsb/bin/itkIOTests
> itkSymmetricSecondRankTensorImageReadTest
> /mnt/datab/itkcvsb/Testing/Temporary/testSymmetricTensor1.nrrd
> /mnt/datab/itkcvsb/Testing/Temporary/testSymmetricTensor2.nrrd
> 941: Test timeout computed to be: 1500
> 941: Tensor read does not match expected values
> 941: Index [0, 0]
> 941: Tensor value
> 941: 1  2  2
> 941: Matrix value
> 941: 1 2
> 941: 2 3
> 941:
>
> If the commented code, where an image of 2D SymmetricSecondRankTensor (
> instead of itk::Matrix ) is written, is used with the MetaImage format the
> test can pass.
>
> Is it OK to change the test as in the commented code, or are other changes
> required?
>
> Thanks,
> Matt
>
>
>
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