[Insight-users] Dynamic Threshold Filter

[Lassi Paavolainen]

Hi,

On Sat, 6 Mar 2010, Luis Ibanez wrote:

> Hi Christian,
>
> You could do:
>
> 1) Pass the input image through the
>    MeanImageFilter (with your kernel size)
>
> 2) Subtract the outcome of (1) from the input
>    image by using the SubtractImageFilter
>
> 3) Threshold the output of (2) with the standard
>     BinaryThreshold image filter.
>
>
> Of course, you could also implement this filter
> by merging together the code of the Mean
> subtract and threshold filters (not in a pipeline,
> but as a single pass filter).
>
> If you take this last option, it will be great if you
> share the filter with the ITK community by posting
> the code as a paper to the Insight Journal   :-)
>
>      http://www.insight-journal.org

This is exactly what itkDynamicThreshold3DImageFilter does in BioImageXD:
http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.txx?revision=1568&view=markup
http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.h?revision=1473&view=markup

Its GPL licensed, but I think that if there is need for it, we can release 
it as BSD and make a Insight Journal article. Though, I don't have time 
for this before May.

Maybe the Adaptive Thresholding Image Filter published in Insight Journal:
http://www.insight-journal.org/browse/publication/702

can already do the same thing and more. Haven't checked it yet.

Lassi

> -------------------------------
> On Fri, Mar 5, 2010 at 1:24 PM, Christian Werner
> <christian.werner at rwth-aachen.de> wrote:
>> Hello!
>>
>> I didn't get to find a dynamic threshold filter in ITK, is there such? It is
>> typically used to extract pixel/voxels who's value differ about a certain
>> threshold from the average of a neigborhood in a given distance (kernel
>> size).
>>
>> In contrast to the simple BinaryThresholdImageFilter it catches elements
>> that "stand out" from the neighborhood.
>>
>> Any suggestions?
>>
>>
>> Best regards,
>> Christian
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>
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-- 
Lassi Paavolainen, M.Sc
Software Engineer, PhD Student in Computer Science
BioImageXD (http://www.bioimagexd.net)
University of Jyväskylä
lassi.paavolainen at jyu.fi