[Insight-users] Local Otsu and Region Splitter

[Neil Panjwani]

Well, to deal with the unwanted regions when building the histogram for the
Otsu threshold, I just modified the Otsu calculator to use a histogram min
and max. I don't know why it doesn't have that functionality built in
already...But the mask adaptor looks interesting.

The Otsu calculator does have a SetRegion() method. I'm just struggling to
break the image into regions first. I need relatively small hypercubes.

I'm currently trying the Adaptive Thresholding paper:

http://www.midasjournal.org/browse/publication/702

Thanks for your help

On Tue, Jun 7, 2011 at 7:37 PM, Richard Beare <richard.beare at gmail.com>wrote:

> If your region can be defined by a mask there is a MaskAdaptor you can use.
>
> http://hdl.handle.net/1926/575
>
> More flexible than hypercubes, but possibly not what you're after.
>
> I thought that the OtsuThresholdImageCalculator has a SetRegion
> method, which should do something along the lines of what you want.
> However you'll need to apply the threshold separately.
>
> On Wed, Jun 8, 2011 at 9:02 AM, Neil Panjwani <paniwani at gmail.com> wrote:
> > Hi,
> > I need to split my image region into several subregions (hyper cubes) to
> > compute a local otsu threshold. I tried using
> > the ImageRegionMultidimensionalSplitter, but it is buggy and produces
> > invalid subregions. My test image is 512x512x5 but the filter returned an
> > index of 0,0,6.
> > I'm using ITK 3.20.0. I noticed in ITKv4 that this filter was changed.
> When
> > trying it in ITKv4, however, I ran into another error in that I was
> unable
> > to read my dicom series (GDCMImageIO...: Cannot read requested file).
> > How do I get around these pesky problems? I do not want to move all my
> code
> > to ITKv4 in the fear that even more will break and require hours and
> hours
> > of debugging...
> > Does someone have code to compute a local otsu threshold?
> > Thanks,
> > Neil
> >
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