[ITK-users] [ITK] Export specific frame/slice of multiframe dicom file: ExtractSliceImageFilter?

[Marcos]

Hmmm, yes, that's the idea.

I was trying, and I think I got it, but something is wrong connecting its
output to the input of another filter:

void Exporter::exportOriginal(QString fileName, ImageType::Pointer
image, int frame)

{

    typedef itk::ImageFileWriter<ImageType> WriterType;

    WriterType::Pointer writer = WriterType::New();

    writer->SetFileName(fileName.toStdString().c_str());

    writer->SetInput(image);


    ImageType::RegionType inputRegion = image->GetLargestPossibleRegion();

    ImageType::IndexType index = inputRegion.GetIndex();

    ImageType::SizeType size = inputRegion.GetSize();


    index[0] = 0;

    index[1] = 0;

    index[2] = frame;

    size[2] = 0;


    ImageType::RegionType outputRegion;

    outputRegion.SetIndex(index);

    outputRegion.SetSize(size);


    typedef itk::Testing::ExtractSliceImageFilter<ImageType,
FrameImageType> ExtractType;

    ExtractType::Pointer extracter = ExtractType::New();

    extracter->SetExtractionRegion(outputRegion);


    writer->GetInput(extracter->GetOutput());

    try

    {

        writer->Update();

    }

    catch (itk::ExceptionObject &ex)

    {

        std:cerr << ex << std::endl;

    }

}


Trying to compile, it gives me:


"error: C2664: 'const itk::Image<UTILS::PixelType,3>
*itk::ImageFileWriter<UTILS::ImageType>::GetInput(unsigned int)' :
cannot convert argument 1 from 'itk::Image<UTILS::PixelType,2> *' to
'unsigned int'
There is no context in which this conversion is possible"


Well, where is the unsigned int?? The input and output format of
ExtractSliceImageFilter were unsigned short, and after seeing this I
changed to unsigned int, with same result.


Anyone seeing the problem? Cause I can't understand the error.


Thank you.


2015-09-01 10:31 GMT+02:00 Timothee Evain <tevain at telecom-paristech.fr>:

> Hello Marcos,
>
> You can extract one slice from your 3D data with itk::ExtractImageFilter
> You have to specify the region you want to get as indicated here
> http://www.itk.org/Doxygen/html/classitk_1_1ExtractImageFilter.html
> More precisely, you have to indicate the index of the slice you want and
> set the third dimension size to 0.
> For example, saying you have an image 250x250x250 and you want the 89th
> slice you have to set:
> RegionSize = {250,250,0}
> RegionIndex = {0,0,89}
>
> The filter return a 2D image when you collapse the third dimension.
>
> I think this can be what you want ?
>
> Tim
>
> ----- Mail original -----
> De: "Marcos" <fotosentido at gmail.com>
> À: insight-users at itk.org
> Envoyé: Mardi 1 Septembre 2015 09:45:00
> Objet: Re: [ITK] [ITK-users] Export specific frame/slice of multiframe
> dicom   file: ExtractSliceImageFilter?
>
> Hi,
>
> the input of vtkJPEGWriter:
>
> template < class T >
> void Exporter :: exportImage ( QString fileName , QVTKWidget * widget )
> {
> vtkWindowToImageFilter * filter = vtkWindowToImageFilter :: New ();
> filter -> SetInput ( widget -> GetRenderWindow ());
>
> vtkSmartPointer < T > writer = vtkSmartPointer < T >:: New ();
> writer -> SetFileName ( fileName . toStdString (). c_str ());
> writer -> SetInputConnection ( filter -> GetOutputPort ());
>
> writer -> Write ();
> }
>
> T can be an vtkJPEGWriter, vtkPNGWriter, etc.
> I set the slice with vtkImageViewer2::GetSlice()
> But this depends on the vtk renderwindow, and its size,...
>
> That's why I need to do it with ITK, unless I can export the original
> frame with VTK.
>
> Thank you.
>
> 2015-09-01 1:16 GMT+02:00 Siavash Khallaghi < siavashk at ece.ubc.ca > :
>
>
> Hi Marcos,
>
> How do you set the input of your vtkJPEGWriter?
>
> Siavash
>
>
>
> --
> View this message in context:
> http://itk-users.7.n7.nabble.com/ITK-users-Export-specific-frame-slice-of-multiframe-dicom-file-ExtractSliceImageFilter-tp36081p36084.html
> Sent from the ITK - Users mailing list archive at Nabble.com.
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