[Insight-users] MaximumKernelWidth

[Bert]

Dear Luis,
Thanks a lot for your answer. This is the error I get when I try to use the
DiscreteGaussianImageFilter with unsigned char pixels:

d:\itk\source\insighttoolkit-3.4.0\code\basicfilters\itkNeighborhoodOperatorImag
eFilter.txx:96:
itk::ERROR: NeighborhoodOperatorImageFilter(017D9CF0): This filter can only
crea
te images of signed data type.

Best regards
Bert


On Tue, May 13, 2008 at 12:15 AM, Luis Ibanez <luis.ibanez at kitware.com>
wrote:

>
> Hi Bert,
>
> 1) Bad news: unfortunately the maximum kernel width is set by a single
>   value for all dimensions of the image.
>
> 2) Good news: it may not be too hard to modify this filter in order
>   to allow you to use a different kernel size on each dimension.
>   When you look at the actual code in GenerateData(), lines 195,
>   215,216,217, the Gaussian operator is actually run on every
>   dimension at a time.
>
>   You could follow the example of what is done with the MaximumError
>   variable.
>
> 3) Is your motivation to perform blurring with a different sigma
>   along each dimension ?
>
> 4) The pixel type may be indeed an issue. Both the test and example
>   that we have in ITK are using float as pixel type...
>
>   Are you seeing any artifacts in the output when you use an unsigned
>   char image as input ?
>
>
> Please let us know,
>
>
>   Thanks
>
>
>
>       Luis
>
>
>
> ---------------
> Bert wrote:
>
> > Dear all,
> >
> > I am trying to use the itkDiscreteGaussianImageFilter and I would like
> > to know if it is possible to set different values for the MaximumKernelWidth
> > depending on the dimension. I has also some problems, because I am using
> > unsigned char pixels and I think this filter only work with signed char, is
> > it right?
> >
> > Best regards
> > Bert
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
>
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