[Insight-users] Open/Close operation just within a mask

[Luis Ibanez]

Hi Roman,

0) The term "DilationByRecontruction" in
http://www.itk.org/Doxygen/html/classitk_1_1OpeningByReconstructionImageFilter.html

     seems to be a typo, since we don't have such
     an operation.

1) It seems that we have misinterpreted your need
    here.


Let me suggest then the following:

a) Take the input image and the mask,
     pass them to the MaskImageFilter,
b)  pass the output of the MaskImageFilter
     to the Opening filter,
c)  Take the original input image and the
     mask and pass them to the Negated
     Mask filter
d)  Finally make an OR of the output of
     the opening filter and the negated mask
     filter.

Yes... this takes a lot more memory and
processing time, but at least seems to be
the actual process that you want to accomplish.


     Regards,


            Luis


---------------------------------------------------------------
On Wed, Nov 4, 2009 at 8:40 AM, Roman Grothausmann
<roman.grothausmann at helmholtz-berlin.de> wrote:
> Luis Ibanez wrote:
>>
>> Hi Roman,
>>
>> You may want to try the filters:
>>
>> ReconstructionByDilationImageFilter
>>
>> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1ReconstructionByDilationImageFilter.html
>>
>> ReconstructionByErosionFilter
>>
>> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1ReconstructionByErosionImageFilter.html
>>
>>
>> That were contributed by Gatean Lehmann.
>>
>> Please let us know if that's what you are looking for,
>>
>
> I'm looking for a "binary morphology open" that is only performed within the
> areas of the marker image. If I get the description of
> ReconstructionByDilation right then this is not what I need.
> Is DilationByRecontruction (as mentioned in
> http://www.itk.org/Doxygen/html/classitk_1_1OpeningByReconstructionImageFilter.html)
> the same as ReconstructionByDilation?
>
> Thanks a lot for Your help
> Roman
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