[vtkusers] Question about image resampling

[Pankaj Daga]

Hi david,

This 2 reslicer trick is what I needed!

Thanks a ton! You rock!

Pankaj

On 10/30/06, David Gobbi <dgobbi at atamai.com> wrote:
>
> Pankaj Daga wrote:
> > Hi David,
> >
> > Thanks for the tip! However, I am not using AutoCropOutput() and all
> > that as it never worked how I intended.
>
> Yeah, that method is not one of my favorites. Not everyone wants their
> images to be cropped the same way, so the only way "AutoCrop" could be
> really automatic is if it could read minds.  The method does work as the
> documentation describes, though.
>
> > I mean, I could set the output extent etc. by hand again, but the
> > output of the reslicer is attached to a viewer and that would cause
> > the viewer to also change its output.
> >
> > So, I was thinking that I could just resample the image again and that
> > should take care of everything.
>
> Oh, that explains things.  If you need two reslicers, here is what you
> can for the second one:
>
> reslice2 = vtkImageReslice::New();
> reslice2->SetInput(reslice1->GetOutput());
> reslice2->SetInformationInput(reslice1->GetInput());
> reslice2->TransformInputSamplingOff();
> reslice2->SetInterpolationModeToLinear();
>
> The combination of SetInformationInput() to set the original image, and
> TransformInputSamplingOff(), will cause vtkImageReslice to produce an
> image with the same extent, spacing, and origin as the original image,
> if this is what you want.
>
> If this isn't what you want, you might have to manually set the
> OutputExtent(), OutputSpacing(), and OutputOrigin().  One of the best
> ways to do this is to add an observer for ExecuteInformationEvent to the
> reslicer.  That way, you can add a callback that will adjust the
> information every time that reslice executes.
>
> - David
>
> >
> > Best regards,
> >
> > Pankaj
> >
> > On 10/30/06, * David Gobbi* <dgobbi at atamai.com
> > <mailto:dgobbi at atamai.com>> wrote:
> >
> >     Hi Pankaj,
> >
> >     I think that what you want is this:
> >
> >     reslice->TransformInputSamplingOff();
> >     reslice->AutoCropOutputOff();
> >
> >     That should cause vtkImageReslice to automatically produce an output
> >     with the same spacing, origin, and dimensions as the input, so
> >     that you
> >     will not have to re-resample the output.
> >
> >     - David
> >
> >
> >
> >     Pankaj Daga wrote:
> >     > Hi everyone,
> >     >
> >     > I do some oeprations on an image and then I need to save a
> resulting
> >     > image. Now to generate the resulting image, I use the output from
> >     > vtkImageReslice which has changed the image dimensions according
> to
> >     > the output spacing and output extent parameters. However, I want
> to
> >     > save the resulting image with the same size as the input image.
> >     >
> >     > Does anyone know what is the best way to resample the output
> >     image and
> >     > convert it to the same image dimensions as the input image? Some
> >     code
> >     > snippet would be really appreciated.
> >     >
> >     > Best wishes,
> >     > P
> >     >
> >
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> >
>
>
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