[vtkusers] vtkImageReslice using stencil

[David Gobbi]

That's good to hear.  Yesterday I patched vtkImageReslice so that
reslice.SetOutputOriginToDefault() doesn't set the value to 1.0e+300
anymore, it just sets an internal flag instead.  That will be one less
confusing thing about this class.

  David


2010/9/23 E.R <frantic_tictoc83 at yahoo.gr>:
> My problem solved!
> Thank You, David!
>
> Elias
>
> --- Στις Τρίτ., 21/09/10, 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: Τρίτη, 21 Σεπτέμβριος 2010, 22:48
>> My guess is that you are not building
>> the ResliceAxes the right way.
>> You want the reslice axes to cause a rotation around the
>> center of the
>> volume, so you need them to do this:
>>
>> 1) shift to the center of the volume
>> 2) rotate
>> 3) shift back again, the opposite of (1)
>>
>> If you have a stack of images, you should set the center to
>> (CenterX,
>> CenterY, CenterZ), unless you specifically want to rotate
>> around a
>> point in the first slice.
>>
>> The reason that SetOutputOriginToDefault() sets 1e+300 is
>> that this
>> large value is a flag to reslice that causes it to
>> internally compute
>> a "best guess" for the origin.  It tries to find an
>> origin that will
>> display as much of the image as possible, i.e. the
>> "Default" causes it
>> to a shift the image around in order to get the best view.
>>
>>   David
>>
>>
>> 2010/9/21 E.R <frantic_tictoc83 at yahoo.gr>:
>> >
>> > I did the following steps:
>> >
>> > -vtkAppender is connected to vtkImageReslice.
>> > -Appender.SetAppendAxis(2);
>> > -The vtkImageData (of the Volume) 's origin is 0,0,0
>> > -I set the ResliceAxes with an offset in the center
>> (CenterX,CenterY,0) the volume.
>> > -I set Reslice's outspacing same as the volume.
>> > -I set Reslice 's outExtent (0, 511,0,804,0,0)
>> >
>> > When i call reslice.SetOutputOriginToDefault(), I get
>> an origin's value like 1.0e+300. Why is that? but I can see
>>  correct the whole image (reslice). (I dont use any vtk
>> Viewer,just taking image's data from the vtkImageReslice and
>> draw them by myself)
>> > if I call reslice.SetOutputOrigin(0,0,0), I can see a
>> black image with only one row of pixels in the top.
>> > What I am doing wrong?? Miss anything?
>> >
>> >
>> >
>> > --- Στις Τρίτ., 21/09/10, 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: Τρίτη, 21
>> Σεπτέμβριος 2010, 18:18
>> >> 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
>> >> >> >> >> > >
>> >> >> >> >> > >
>> >> >> >> >> > >
>> >> >> >>
>> >> _______________________________________________
>> >> >> >> >> > > Powered by
>> >> www.kitware.com
>> >> >> >> >> > >
>> >> >> >> >> > > Visit other
>> Kitware
>> >> open-source
>> >> >> projects
>> >> >> >> at http://www.kitware.com/opensource/opensource.html
>> >> >> >> >> > >
>> >> >> >> >> > > Please keep
>> messages
>> >> on-topic
>> >> >> and check
>> >> >> >> the VTK
>> >> >> >> >> FAQ
>> >> >> >> >> > at: http://www.vtk.org/Wiki/VTK_FAQ
>> >> >> >> >> > >
>> >> >> >> >> > > Follow this
>> link to
>> >> >> >> subscribe/unsubscribe:
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>> >> >> >> >> > >
>> >> >> >> >> > >
>> >> >> >> >> >
>> >> >> >> >> >
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >
>> >> >> >> >
>> >> >> >> >
>> >> >>
>> _______________________________________________
>> >> >> >> > Powered by www.kitware.com
>> >> >> >> >
>> >> >> >> > Visit other Kitware
>> open-source
>> >> projects at
>> >> >> http://www.kitware.com/opensource/opensource.html
>> >> >> >> >
>> >> >> >> > Please keep messages
>> on-topic and
>> >> check the
>> >> >> VTK FAQ
>> >> >> >> at: http://www.vtk.org/Wiki/VTK_FAQ
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