[Insight-users] Adaptive Threshold Segmentation

[Kishore Mosaliganti]

Hi,

Coincidentally, I have an adaptive threshold filter that is similar to the
one available in MATLAB Central. It makes use of a median filter to estimate
the local bias and computes an Otsu threshold locally at a point for a given
neighborhood. I was planning to submit this to ITK shortly.

However, it is not based on the connected component method described below.
If you are interested, I can send it to you.

Kishore



On Thu, Sep 17, 2009 at 5:09 AM, Lassi Paavolainen <lassi.paavolainen at jyu.fi
> wrote:

> Hi Edward,
>
> I haven't seen any adaptive threshold method in ITK.
>
> On Thu, 17 Sep 2009, Somer, Edward wrote:
>
>  I'd write a class that inherited ConnectedThresholdImageFilter and add an
>> observer to update the lower threshold at each iteration as a set percentage
>> of the region mean. The filter would be initialised with a seed point and
>> iterate until the region grew no further.
>>
>
> This sounds correct if you are planning to do adaptive region growing
> segmentation. We have done adaptive threshold in BioImageXD project just by
> using mean or median filter and then comparing this result image to the
> original one. I guess this sort of adaptive thresholding is not what you are
> looking for, but you specifically want to do it in region growing way?
>
> Anyway the code is available at:
>
> http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.txx?revision=1473
>
> http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.h?revision=1473
>
> for anyone who is interested.
>
> Lassi
>
> --
> Lassi Paavolainen, M.Sc.
> Software Engineer
> BioImageXD (http://www.bioimagexd.net)
> lassi.paavolainen at jyu.fi
>
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