[ITK-users] itkImageFileWriter + ExtractSliceImageFilter: largest region exception

[Marcos]

Hi,

I know the input and desired regions, not sure how to look for the buffered
region.

1. Reviewing my code I saw I didn't set the input image for the extracter,
so I added:
extracter->SetInput(image);

Good, right? But no. Still the same error.

2. Then I tried switching to itkExtractImageFilter, and I got:
Exception at 0x7633c42d, code: 0xe06d7363: C++ exception, flags=0x1
(execution cannot be continued) (first chance) at
c:\itk-4.8.0-installed\include\itk-4.8\itkextractimagefilter.hxx:242

So I had to look inside this code (why don't throw me more info in the try
catch?) to see what's happening, and I read this:
itkExceptionMacro( << "It is required that the strategy for collapsing the
direction matrix be explicitly specified. " << "Set with either
myfilter->SetDirectionCollapseToIdentity() or
myfilter->SetDirectionCollapseToSubmatrix() " << typeid( ImageBase<
InputImageDimension > * ).name() );
3. I also tried to insert a:
image->Update();
or
image->UpdateOutputData();
with same results.

I was thinking about passing the reader, but I'd like to apply changes to
my image, so this method would receive a modified copy (no DeepCopy method
like in vtk?)


Yes, the input image is connected to a pipeline:
itk::Image -> itk::ImageToVTKImageFilter -> vtk::vtkImageFlip ->
vtkImageData -> vtkImageViewer2


Thanks again for your interest.


2015-09-08 16:16 GMT+02:00 Bradley Lowekamp <blowekamp at mail.nih.gov>:

> Hello,
>
> What is the buffered region for the input image? Is the input image
> connected to a pipeline?
>
> Perhaps you just forgot to update the input image before running this
> function?
>
> Brad
>
> On Sep 7, 2015, at 5:21 PM, Marcos <fotosentido at gmail.com> wrote:
>
> Hi,
>
> I have a method that was exporting fine one frame from my itk::Image.
>
> My method:
>
> void Exporter::exportOriginal(QString fileName, ImageType::Pointer image, int frame)
>
> {
>
>     typedef itk::ImageFileWriter<FrameImageType> WriterType;
>
>     WriterType::Pointer writer = WriterType::New();
>
>
>     writer->SetFileName(fileName.toStdString().c_str());
>
>
>     ImageType::RegionType inputRegion = image->GetLargestPossibleRegion();
>
>
>     ImageType::IndexType index = inputRegion.GetIndex();
>
>     ImageType::SizeType size = inputRegion.GetSize();
>
>
>     index[0] = 0;
>
>     index[1] = 0;
>
>     index[2] = frame;
>
>
>     // 3D to 2D
>
>     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->SetInput(extracter->GetOutput());
>
>     try
>
>     {
>
>         writer->Update();
>
>     }
>
>     catch (itk::ExceptionObject &ex)
>
>     {
>
>         std:cerr << ex << std::endl;
>
>     }
>
> }
>
>
> as inputRegion, I have:
> index: [0, 0, 0]
> size: [512, 512, 12]
>
> as outputRegion, I have:
> index: [0, 0, 1]                   # first frame
> size: [512, 512, 0]
>
>
>
> But I'm not sure what happened, now with every image I got an exception:
> itkimagefilewriter.hxx:287: "Largest possible region does not fully
> contain requested paste IO region"
>
> By the way, my try catch is not getting the exception message, I had to
> look inside the writer class.
> Any ideas? Thank you.
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