[vtkusers] vtkImageReslice using stencil

[David Gobbi]

Hi Elias,

You don't give enough information in your email.  When you say
"it isn't working", that does not tell me what is going wrong.  Is
the output shifted?  Empty?  Black?  Does it crash?

   David


2010/9/20 E.R <frantic_tictoc83 at yahoo.gr>:
> Thank you very much!
>
> How I extract a specific region with reslice.SetOutputExtent(100, 300, 250, 300, 0, 0)? ?
>
> It's not working...Its the same with reslice.SetOuputExtent(0,200,0,50,0,0)...
>
>
> --- Στις Δευτ., 20/09/10, ο/η David Gobbi <david.gobbi at gmail.com> έγραψε:
>
>> Από: David Gobbi <david.gobbi at gmail.com>
>> Θέμα: Re: [vtkusers] vtkImageReslice using stencil
>> Προς: "E.R" <frantic_tictoc83 at yahoo.gr>
>> Κοιν.: vtkusers at vtk.org
>> Ημερομηνία: Δευτέρα, 20 Σεπτέμβριος 2010, 17:09
>> Hi Elias,
>>
>> I recommend that you don't use vtkImageStencilData for what
>> you are
>> doing.  Instead, you should first use reslice on just
>> the region, and
>> then pad the output with vtkImagePadFilter:
>>
>>  padFilter.SetInputConnection(reslice.GetOutputPort());
>>  reslice.SetOutputExtent(100, 300, 250, 300, 0, 0);
>>  padFilter.SetOutputExtent(0, 511,0,804,0,0);
>>
>> With stencils, you cannot easily build a
>> vtkImageStencilData from
>> scratch.  The vtkImageStencilData should be only be
>> produced by a
>> source or filter.
>>
>>   David
>>
>>
>>
>>
>>
>>
>> 2010/9/20 E.R <frantic_tictoc83 at yahoo.gr>:
>> >  I have tried this..but I got a memory
>> >  error.."Attempted to read or write protected
>> memory"...
>> >  What I am doing wrong????? :-|
>> >
>> >> --- Στις Δευτ., 20/09/10, ο/η Jim
>> Peterson <jimcp at cox.net>
>> >> έγραψε:
>> >>
>> >> > Από: Jim Peterson <jimcp at cox.net>
>> >> > Θέμα: Re: [vtkusers] vtkImageReslice
>> using
>> >> stencil
>> >> > Προς: "E.R" <frantic_tictoc83 at yahoo.gr>
>> >> > Κοιν.: vtkusers at vtk.org
>> >> > Ημερομηνία: Δευτέρα, 20
>> >> Σεπτέμβριος 2010, 15:15
>> >> > Elias,
>> >> > If I read that error message correctly, it
>> sounds
>> >> like
>> >> > reslice.SetOutputExtent(100,300,250,300,0,0)
>> ;
>> >> > would be accepted. The question is would it
>> be the
>> >> desired
>> >> > result?
>> >> >
>> >> > HTH
>> >> > Jim
>> >> >
>> >> > E.R wrote:
>> >> > > Greetings!!
>> >> > >
>> >> > > I am using vtkImageReslice.setStencil()
>> to limit
>> >> a
>> >> > specific area.
>> >> > > My code is like that:
>> >> > > vtkImageStencilData test = new
>> >> vtkImageStencilData();
>> >> > >
>> >> > > test.SetExtent(100, 300, 250, 300, 0,
>> 0);
>> >> > >  reslice.SetStencil(test);
>> >> > >  reslice.SetOutputExtent(0,
>> 511,0,804,0,0);
>> >> > >
>> >> > > but I am getting this error message:
>> >> > >
>> >> > > "The update extent specified in the
>> information
>> >> for
>> >> > output port 0 on algorithm
>> >> vtkTrivialProducer(086731A0) is 0
>> >> > 511 0 804 0 0, which is outside the whole
>> extent 100
>> >> 300 250
>> >> > 300 0 0."
>> >> > >
>> >> > > What I am doing wrong?? How I ll set the
>> stencil
>> >> > inside my Image bounds?
>> >> > >
>> >> > > thanks in advance!
>> >> > >
>> >> > > Elias
>> >> > >
>> >> > >
>> >> > >
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