[ITK-users] Can I alter the way SliceBySliceImageFilter defines the origin of the internal slices?

[Matt McCormick]

Yes, that is an issue -- good catch!


If we change:

   internalOutputRegion.SetIndex( internal_i, requestedIndex[i] );

to:

   internalOutputRegion.SetIndex( internal_i, 0 );

and

  internalInputRegion.SetIndex( internal_i,
this->GetInput(0)->GetRequestedRegion().GetIndex(i) );

to:

  internalInputRegion.SetIndex( internal_i,
0 );


is the behavior corrected?

Thanks,
Matt

On Fri, Sep 8, 2017 at 11:13 AM, hellman <fredrik.hellman at gmail.com> wrote:
> I am not sure. In SliceBySliceImageFilter.hxx for ITK 4.12.0, on line 188, it
> says:
>
>   // copy the requested region to the internal slice region in
>   // dimension order
>   unsigned int internal_i = 0;
>   for ( unsigned int i = 0; internal_i < InternalImageDimension; ++i,
> ++internal_i )
>     {
>     if ( i == this->m_Dimension )
>       {
>       ++i;
>       }
>     internalOutputRegion.SetSize( internal_i, requestedSize[i] );
>     internalOutputRegion.SetIndex( internal_i, requestedIndex[i] );
>
>     internalInputRegion.SetSize( internal_i,
> this->GetInput(0)->GetRequestedRegion().GetSize(i) );
>     internalInputRegion.SetIndex( internal_i,
> this->GetInput(0)->GetRequestedRegion().GetIndex(i) );
>
>     }
>
> This will copy all indices (except the slicing dimension) of input 0 to
> internalInputRegion, which is set as the regions for the internal image
> further down. In my case, the 5s get copied here.
>
> I have also stopped in a debugger in ImageToImageFilter (of my
> BinaryFunctorImageFilter) where the check that the physical regions overlap
> is performed. At this point, both images have the same region index [5, 5],
> but one image has origin (0, 0) and the sliced image has origin (1.5, 1.5).
>
>
>
>
> --
> Sent from: http://itk-users.7.n7.nabble.com/
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