[Insight-users] Re: [Insight-developers] strange background values andBinaryErodeImageFilter

[Gaetan Lehmann]

Hi,

I have just uploaded an new BinaryErodeImageFilter which solve a border  
problem when the requested region is smaller than the largest available  
region, and also solve some smaller issues.
If you are interested in this filter, please, (re)download it from:
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryErodeImageFilter.h
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryErodeImageFilter.txx

You may also be interested by binary opening and closing. Those filters  
are designed to take care of background values and border effects:
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryMorphologicalClosingImageFilter.h
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryMorphologicalClosingImageFilter.txx
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryMorphologicalOpeningImageFilter.h
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/itkBinaryMorphologicalOpeningImageFilter.txx

Regards,

Gaetan

On Thu, 25 Aug 2005 15:09:30 +0200, Gaetan Lehmann  
<gaetan.lehmann at jouy.inra.fr> wrote:

> On Thu, 25 Aug 2005 14:04:45 +0200, Miller, James V (Research)  
> <millerjv at crd.ge.com> wrote:
>
>> I think your images look reasonable.  It might be nice if we
>> can get the old binary erode to produce the same result.
>>
>> It will be great to have a FastIncremental erode capability.
>
> It just need to be imported :-)
> http://voxel.jouy.inra.fr/itkBinaryErodeImageFilter.h
> http://voxel.jouy.inra.fr/itkBinaryErodeImageFilter.txx
>
> Sorry, I have already renamed the class to BinaryErodeImageFilter for my  
> own use, so you should have to rename it  
> FastIncrementalBinaryErodeImageFilter (but I'm not sure it's useful, see  
> below)
>
>> Then we could replace the old dilate/erode with the FastIncremental
>> (having the old routines subclass the new and have no real  
>> implementation).
>
> Why keep the 2 sets of classes (fast incremental ones and normal ones) ?
> FastIncrementalBinaryDilateImageFilter is used only in  
> SignedDanielssonDistanceMapImageFilter, and was not in the previous ITK  
> release.
>
> I think  FastIncrementalBinaryDilateImageFilter  should only be renamed  
> BinaryDilateImageFilter and the current BinaryDilateImageFilter be  
> dropped (and the same for binary erosion filter) :-)
>
>>
>> Jim
>>
>> -----Original Message-----
>> From: insight-developers-bounces+millerjv=crd.ge.com at itk.org
>> [mailto:insight-developers-bounces+millerjv=crd.ge.com at itk.org]On Behalf
>> Of Gaetan Lehmann
>> Sent: Thursday, August 25, 2005 7:42 AM
>> To: insight-developers at itk.org; insight-users at itk.org
>> Subject: [Insight-developers] strange background values
>> andBinaryErodeImageFilter
>>
>>
>> Hi,
>>
>> I have modified FastIncrementalBinaryDilateImageFilter to implement an
>> efficient binary erosion filter.
>>
>> I'm not able to easily reproduce the way BinaryErodeImageFilter set the
>> background value. In fact, it seems to be quite strange.
>> I have attached 3 files :
>>   + bw.png is the source image. There is 3 colors in it. The white is  
>> the
>> foreground value for erosion while gray and black are
>> both background.
>>   + out-current.png is the result of a binary erosion with a circular
>> kernel with a radius of 15
>>   You can notice that the eroded disk in the middle of the shape is grey
>> while the others eroded pixels are black. Also, the 2
>> gray shapes in the top of the image are modified.
>>   + out-fast.png is the result of the same erosion with the modified
>> FastIncrementalBinaryDilateImageFilter. The white shape is
>> the same (great !). All eroded pixels are black, shapes at the top of  
>> the
>> image are not modified, and the gray disk is still
>> visible inside the white shape.
>>
>> Can we use the second behavior for the binary erode image filter ? I  
>> find
>> it really more consistent than the current behavior, and it should avoid
>> to spend time to reproduce a quite strange behavior.
>>
>> Regards,
>>
>> Gaetan
>>
>
>
>



-- 
Gaetan Lehmann <gaetan.lehmann at jouy.inra.fr>
Tel: +33 1 34 65 29 66
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
Web: http://voxel.jouy.inra.fr