[Insight-users] Resampling segmentation

[Marius Erdt]

Hi Luis,

yes, the AntiAliasFilter in combination with resampling does exactly 
what I need.

Thanks a lot!
Marius

Luis Ibanez wrote:
>
> Hi Marius,
>
> Is it your purpose to increase the resolution of a binary image ?
>
>
> In that case, you may want to try one othe following:
>
>
>    1) binaryImage -> DistanceMap -> Resample -> Threshold
>
>                           or
>
>    2) binaryImage ->AntiAliasFilter ->Resample -> Threshold
>
>
> In the resampler you can now use a Linear interpolator.
>
> In this way the resampling will have enough information for
> reconstructing the contours of the segmentation, and you
> will be able to recover a binary image at the end by
> thresholding.
>
>
>     Regards,
>
>
>         Luis
>
>
>
> ------------------
> Marius Erdt wrote:
>> 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
>>>> _______________________________________________
>>>> Insight-users mailing list
>>>> Insight-users at itk.org
>>>> http://www.itk.org/mailman/listinfo/insight-users
>>>>
>>>>     
>>>
>>>
>>>   
>>
>>
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>