[Insight-developers] ImageToHistogramFilter issue

[Luis Ibanez]

For the record:

We reviewed this with David on Thursday,

and it seems to be a bug in the automatic
computation of minimum and maximum
values for the bins.

David logged a bug entry for this issue:

http://public.kitware.com/Bug/view.php?id=11480


    Luis


--------------------------------
On Wed, Nov 17, 2010 at 4:51 AM, Iván Macía <imacia at vicomtech.org> wrote:

> Hi David,
>
> For our applications we have been using
> itk::ScalarImageToHistogramGenerator
> with the new Statistics framework, since we suffered the overflow issue
> with
> the previous version. The corresponding multi-component version seems to be
> itk::ImageToHistogramGenerator.
>
> Having a look at the documentation of ITK 3.20 I don't clearly see what is
> the difference between itk::ImageToHistogramGenerator and
> itk::ImageToHistogramFilter. Furthermore, the API for the later seems to be
> a bit obscure (SetInput1()? SetInput3()? SetInput5()?). In general there is
> a lack of documentation of these filters.
>
> It seems like itk::ImageToHistogramGenerator is not part of ITK 4.0, is
> this
> true? I have been very busy lately and need to put up with all the ITK v4.0
> and git stuff but need some time since it seems to be hard :S
>
> Best regards
>
> Ivan
>
>
>
> -----Mensaje original-----
> De: insight-developers-bounces at itk.org
> [mailto:insight-developers-bounces at itk.org] En nombre de David Doria
> Enviado el: martes, 16 de noviembre de 2010 23:21
> Para: Insight Developers
> Asunto: [Insight-developers] ImageToHistogramFilter issue
>
> Hi all,
>
> I am trying to use the ImageToHistogramFilter. I see some unexpected
> things when I create an iterator to traverse the histogram. First, it
> seems to only traverse the first component. That is, I see indices of
>
> 0, 0, 0
> 1, 0, 0
> 2, 0, 0
> ...
> 0, 0, 0 (this repeats exactly from the beginning, rather than
> incrementing  the 2nd or 3rd component)
> 1, 0, 0
> ....
>
> The histogram cell centers (the iterator's .GetMeasurementVector())
> also seem to follow the pattern of the index in that the second two
> components don't move from zero.
>
> Also, my query for "how many red pixels are there?" returns 0, when I
> would expect 2 (there are two red pixels in the example input image).
>
> Here is my demonstration of the problem:
>
> http://www.vtk.org/Wiki/ITK/Examples/Broken/Statistics/ImageToHistogramFilte
> r
>
> Any thoughts? Has anyone successfully created a 3D histogram from an
> image after the Statistics overhaul?
>
> Thanks,
>
> David
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