[Insight-users] [vtkusers] converting from vtk to itk and back again
Jothy
jothybasu at gmail.com
Tue Sep 20 05:23:17 EDT 2011
Sorry for the incomplete message.
Hi Mark,
I wonder whether you can use vtkImageToImageFilter to hold the image data
from the exporter.
Any way I use the itkVTKImageToImageFilter to do the conversion and it works
well for me.
Here is the snippet
typedef itk::Image<unsigned int,3> ImageType;
typedef itk::VTKImageToImageFilter<ImageType>VTKImageToImageType;
VTKImageToImageType::Pointer converter=VTKImageToImageType::New();
converter->SetInput(imgData);
converter->Update();
Now you could get the itk image as converter->GetOutput(). I have
attached the src and headers for you.
Jothy
On Tue, Sep 20, 2011 at 10:19 AM, Jothy <jothybasu at gmail.com> wrote:
> Hi Mark,
>
> I wonder whether you can use vtkImageToImageFilter to hold the image data
> from the exporter.
>
> Any way I use the itkVTKImageToImageFilter to do the conversion and it
> works well for me.
>
> Here is the snippet
>
>
> typedef itk::Image<unsigned int,3> ImageType;
>
> typedef itk::VTKImageToImageFilter<ImageType>VTKImageToImageType;
>
> VTKImageToImageType::Pointer converter=VTKImageToImageType::New();
>
> converter->SetInput(stencil2->GetOutput());
>
> converter->Update();
>
>
>
>
> On Tue, Sep 20, 2011 at 5:59 AM, Mark Roden <mmroden at gmail.com> wrote:
>
>> Hi all,
>>
>> I've looked on google and the various newsgroups and have not found
>> the answer to what I thought was a pretty straightforward question.
>>
>> I have a vtkImageData object that has been obtained... somehow. I do
>> not have the pipeline at this point, just the output. The user could
>> have done any number of things to have arrived at this point, and so I
>> store a vtkImageData that has been DeepCopied off of the end of
>> whatever pipeline was employed.
>>
>> I then want to save that image in the Analyze format. A coworker made
>> his own reader/writer using the information that Mayo put out, but the
>> resulting files don't appear to be oriented correctly. I want to
>> verify if his version is producing a bug, and I wanted to use the itk
>> version of the writing plugin to do the work.
>>
>> Here's what I have:
>>
>> #ifdef ITK_IMG_WRITER
>> #include "vtkImageExport.h"
>> #include <itkVTKImageImport.h>
>> #include "itkImageFileWriter.h"
>> #include "itkAnalyzeImageIO.h"
>> #include "itkImage.h"
>> #include "itkOrientedImage.h"
>> #endif
>>
>>
>> void saveAnalyzeImage(vtkImageData * const image, const QString &file) {
>>
>> #ifdef ITK_IMG_WRITER
>> //this code is done using ITK, and so requires that ITK be included
>> typedef itk::OrientedImage< signed short, 3 > CTImage;
>> typedef itk::ImageFileWriter< CTImage> CTWriter;
>> typedef itk::VTKImageImport<CTImage> VTKImageImportType;
>>
>> CTWriter::Pointer theWriter = CTWriter::New();
>>
>> theWriter->SetFileName(file.toStdString().c_str());
>>
>> vtkImageExport* theExporter = vtkImageExport::New();
>> theExporter->SetInput(image);
>>
>> VTKImageImportType::Pointer vtkImageToImageFilter =
>> VTKImageImportType::New();
>> theExporter->SetOutput(vtkImageToImageFilter);
>> vtkImageToImageFilter->Update();
>>
>> theWriter->SetInput(vtkImageToImageFilter->GetOutput());
>>
>> itk::AnalyzeImageIO::Pointer analyzeIO = itk::AnalyzeImageIO::New();
>> theWriter->SetImageIO(analyzeIO);
>>
>> try {
>> theWriter->Update();
>> } catch(itk::ExceptionObject ex){
>> return; //do something else here for error handling
>> }
>> theWriter->Delete();
>> vtkImageToImageFilter->Delete();
>> analyzeIO->Delete();
>> return;
>>
>> #else
>> //do the other code instead
>> #endif
>> }
>>
>> This code is not compiling, because
>> theExporter->SetOutput(vtkImageToImageFilter) doesn't work. I've also
>> tried just using the VTKImageImportType object directly, but that does
>> not have a SetInput method. As could be guessed from the code, I also
>> tried vtkImageToImageFilter, but that appears to be a deprecated
>> leftover from 2004 or so. Unless there's some include file I'm not
>> finding?
>>
>> All I really want is for vtk to read and write analyze files. Barring
>> that, I want to be able to seamlessly convert from a vtkImageData
>> object to an itk::Image object so I can use itk's analyze export and
>> importing functions. How can I fix that code to make it work?
>>
>> Thanks,
>> Mark
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>
>
>
> --
> Jothybasu K Selvaraj
> PhD Student
> University of Liverpool
> Liverpool,UK
>
>
--
Jothybasu K Selvaraj
PhD Student
University of Liverpool
Liverpool,UK
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