How to use ITKMorphologicalContourInterpolation with two slices

[9Cirno9]

@dzenanz ，
I am sorry to bother you, may I seek expertise on this matter?
Now I have some segmented slices, the type of them is vtkSmartPointer< vtkImageData >
such as:

For example, I have two slices in this type, named image1 and image2.Now I want to make image1 as the first slices and image2 as the last slices, put them into ITKMorphologicalContourInterpolation. But the MCI filter requires the type of "itk::Image< unsigned char, 3 >".
How can I transform these two "vtkSmartPointer" images to "itk::Image< unsigned char, 3 >", what functions or class can I use?
Thanks for your Suggestions two months before, I had posted this question on the forum,but I haven't heard back yet. If its not too much trouble, would you mind sharing your thoughts on this issue?
On behalf of my teachers and schoolmates, I sincerely appreciate your help.

[9Cirno9]

https://discourse.itk.org/t/use-itk-morphologicalcontourinterpolator/6417

[dzenanz]

I already answered it here:

@9Cirno9 I now realized from your email, that you might want interpolation between two 2D images. This can be accomplished by constructing an empty 3D image, and setting those two 2D images as the first and last slice, then running MCI filter on it, in a way similar to how it is done in tests.

[9Cirno9]

I already answered it here:

@9Cirno9 I now realized from your email, that you might want interpolation between two 2D images. This can be accomplished by constructing an empty 3D image, and setting those two 2D images as the first and last slice, then running MCI filter on it, in a way similar to how it is done in tests.

I think so, but I dont know what functions or class can I use to code about inserting the slices as the first and last.

[dzenanz]

Here are some pointers:
https://examples.itk.org/src/filtering/imagegrid/processa2dsliceofa3dimage/documentation
https://itk.org/Doxygen/html/classitk_1_1PasteImageFilter.html
https://examples.itk.org/src/filtering/imagegrid/pasteimageintoanotherone/documentation