[Insight-users] Create my own filter

[Dan Mueller]

Hi Rashedk,

Thanks for describing the filter you are trying to create.

Seeing it is a pixel-wise filter, it's probably best to use the
itkAndImageFilter as a template (this filter is a specialization of
itkBinaryFunctorImageFilter). You will need to rename the functor
(something like "SelectFirstInputIfNotZero") and change the operator()
method to implement your selection:

inline TOutput operator()( const TInput1 & A, const TInput2 & B)
  {
    if ( A > NumericTraits< TInput1 >::Zero )
      {
      return static_cast<TOutput>( A );
      }
   else
      {
      return static_cast<TOutput>( B );
      }
  }

You will then need to rename the filter (including
constructor/destructor), change the functor in the inheritance
statement, and maybe think about the concept checking.

I have had need for such a filter but been too lazy to create it
myself -- perhaps you could submit a short Insight Journal article
(http://www.insight-journal.org) describing the filter?

HTH

Cheers, Dan

On 18/09/2007, rashedk <rashed.vtk at googlemail.com> wrote:
>
> Hi Luis,
>
> Thanks for your quick reply. I was looking at itkBinaryFunctionImageFilter
> since this closely resembles what my filter is aiming to accomplish. I have
> two inputs Image1 and Image2. The output of the filter is a pixel-wise
> selection of the intensity from either Image1 or Image2. At a pixel (x,y,z)
> if Image1(x,y,z) > 0 then output(x,y,z) = image1(x,y,z) ELSE if
> Image1(x,y,z) == 0 then output(x,y,z) = Image2(x,y,z).
>
> I am trying to modify the itkBinaryFunctionImageFilter, but dont understand
> what m_Functor ( ) function in the ThreadedGenerateData( ) function does. I
> can see that it implements the pixel-wise addition, but where is this
> function defined?
>
> Thanks in advance,
>
> Rashed karim
>
>
> Luis Ibanez wrote:
> >
> >
> > Hi Rashedk,
> >
> > It is very easy to create ITK filters that take two images.
> >
> > You may want to look first at the "itkBinaryFunctorImageFilter"
> >
> > This is the base class of all the filters that take two images
> > as input and compute a pixel-wise output.
> >
> > You can ignore the "Functor" aspects of it, and focus on the
> > SetInput1(), SetInput2() methods, the SetNumberOfRequiredInputs()
> > call in the constructor.
> >
> > There are many other filters in ITK that take two images as input.
> >
> > For example:
> >
> > $ grep -l "RequiredInputs( 2 )" *.txx
> > itkBinaryFunctorImageFilter.txx
> > itkContourDirectedMeanDistanceImageFilter.txx
> > itkContourMeanDistanceImageFilter.txx
> > itkDirectedHausdorffDistanceImageFilter.txx
> > itkHausdorffDistanceImageFilter.txx
> > itkInterpolateImageFilter.txx
> > itkNaryFunctorImageFilter.txx
> > itkPolylineMask2DImageFilter.txx
> > itkPolylineMaskImageFilter.txx
> > itkSimilarityIndexImageFilter.txx
> > itkWarpImageFilter.txx
> > itkWarpVectorImageFilter.txx
> >
> >
> > Please let us know if you encounter any problems,
> >
> >
> >     Thanks
> >
> >
> >         Luis
> >
> >
> > ----------------
> > rashedk wrote:
> >> Hi everyone,
> >>
> >> I am trying to write my own filter. The filter will take in two images
> >> (of
> >> the same type) as input and output a single image. All the images are of
> >> the
> >> same dimensions. I was looking at Chapter 13 of the ITK software guide,
> >> especially 13.6. I don't know how to go about extending this since I have
> >> two images as input. I am also not sure If it would be appropriate to
> >> derive
> >> from ImageToImageFilter.
> >>
> >> Any ideas how I should go about doing this?
> >>
> >> Thanks in advance,
> >> Rashed karim.
> >>
> >>
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Create-my-own-filter-tf4449323.html#a12746845
> Sent from the ITK - Users mailing list archive at Nabble.com.
>
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