[vtkusers] vtkImageReslice using stencil

[David Gobbi]

Hi Elias,

You can make vtkImageReslice clip the data by setting the OutputOrigin
and OutputSpacing to be the same as the input's origin and spacing.

reslice.SetOutputExtent(100, 300, 250, 300, 0, 0);
reslice.SetOutputOrigin(...same as for the input data...)
reslice.SetOutputSpacing(...same as for the input data...)

  David


2010/9/21 E.R <frantic_tictoc83 at yahoo.gr>:
> Sorry!
> I mean... I cant extract a specific region inside the reslice.
> I only get the whole Reslice..fitted inside this whole extent (100, 300, 250, 300, 0, 0).
>
> So I used vtkImageClip for that...
>
> my code is like this now:
>
> reslice.SetOutputExtent(0, 511,0,804,0,0);
> clip.SetOuputExtent(100, 300, 250, 300, 0, 0);
> padFilter.SetOutputExtent(0, 511,0,804,0,0);
>
> How I can produce the same result without using vtkImageClip??
>
> --- 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, 22:00
>> 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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