[Insight-users] Resampling segmentation

[Marius Erdt]

I've now tried nearest neighbor interpolation. This, however, just 
scales the current segmentation, but does not smooth the "steps" of the 
segmentation.
I'm thinking about thresholding the linear interpolation result, but I'm 
not sure if the result is "correct" if some arbitrary threshold is used.

Marius

Dan Mueller wrote:
> Hi Marius,
>
> You might want to try setting the the ResampleImageFilter Interpolator
> to a NearestNeighborInterpolateImageFunction:
>     http://www.itk.org/Insight/Doxygen/html/classitk_1_1NearestNeighborInterpolateImageFunction.html
>
> This will keep the resampled output as a binary image.
>
> Is it possible to do the binary segmentation on the resampled MRI
> data? This would be the ideal option in terms of quality...
>
> HTH
>
> Cheers, Dan
>
> 2008/5/15 Marius Erdt <marius.erdt at gmx.de>:
>   
>> Hi,
>>
>> is there a way in ITK to resample not only greyvalue volumes but binary
>> volumes?
>>
>> I've got a binary segmentation that was created from an anisotropic MRI data
>> set. Resampling the MRI data to isotropic voxels is not a problem (using ITK
>> resampleImageFilter). However resampling the binary volume using
>> interpolation produces a non-binary output. I could threshold the result,
>> but that would not be a proper result in terms of linear interpolation
>> between slices.
>>
>> Does anyone have an idea how to resample a binary volume such that the
>> result is equivalent to a linear interpolation between the segmentations of
>> the slices.
>>
>> Thanks for any help,
>>
>> Marius
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>>
>>     
>
>