[Insight-users] WG: Origin in shrink image filter wrong?

[Bill Lorensen]

I believe that the two inputs to checkerboard must have the same
number of pixels in i, j, and k. I am surprised it did not  crash.

On Tue, Dec 15, 2009 at 4:58 AM, Lodron, Gerald
<Gerald.Lodron at joanneum.at> wrote:
>
> Maybe that helps:
>
> vtkImageData    image1; //Spacing: (8.5 8.5 4), Origin (-275 -275 -1285), Dimensions(64,64,64), Increments(0,0,0), Extent(0,63,0,63,0,63), Bounds(-275,266,-275,266,-1285,-1033)
>
> vtkImageData    image2; // the same
> ...
> Blabla
> ...
> vtkImageData   shrinkedImage; //Spacing: (17 17 8), Origin (-270 -270 -1283), Dimensions(32,32,32), Increments(0,0,0), Extent(0,31,0,31,0,31), Bounds(-270,262,-270,262,-1283,-1035)
>
> -----Ursprüngliche Nachricht-----
> Von: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] Im Auftrag von Lodron, Gerald
> Gesendet: Dienstag, 15. Dezember 2009 10:43
> An: insight-users at itk.org
> Betreff: [Insight-users] Origin in shrink image filter wrong?
>
> Hi
>
> I try to downsample a DICOM image with shrink image filter and i come to no sollution. The problem is that the origin of the result is wrong:
>
> When i load the same DICOM 3D image with the same code and downsample one of them by factor two the images should be aligned, am i right? So when i use the checkerboard the only difference should be the ressolution, am i right? But the images are not aligned so what went wrong? I am really at the end of my vodoo.
>
> I use ITK 3.16.0 with following settings on:
> ITK_IMAGE_BEHAVES_AS_ORIENTED_IMAGE
> ITK_USE_CENTERED_PIXEL_COORDINATES_CONSISTENTLY
> ITK_USE_CONSOLATED_MORPHOLOGY
> ITK_USE_OPTIMIZED_REGISTRATION_METHODS
> ITK_USE_ORIENTED_IMAGE_DIRECTION
> ITK_USE_PATENTED
> ITK_USE_REGION_VALIDATION_IN_ITERATORS
> ITK_USE_REVIEW
> ITK_USE_SYSTEM_GDCM     (i installed and use gdcm 2.0.14)
> ITK_USE_TEMPLATE_META_PROGRAMMING_LOOP_UNROLLING
>
> The rest is off.
>
> Here my pseudocode
>
> vtkImageData    image1; //3D image of short
> vtkImageData    image2; //the same
>
> //Image1 is exactly the same as image 2, i use vtkCheckerboard to compare them and they are the same
>
> //first i convert both to ITK
> Itk::VTKImageToImageFilter<...>::Pointer connector1 = ...::New(); Itk::VTKImageToImageFilter<...>::Pointer connector2 = ...::New();
>
> Connector1->SetInput(...)
> ...
> Itk::OrientedImage<...>::pointer image1ITK; Itk::OrientedImage<...>::pointer image2ITK;
>
> //now i use shrink image filter to downsample one of them
>
> itk::ShrinkImageFilter<>::Pointer filter = itk::ShrinkImageFilter<>::New();
> filter->SetInput(image2ITK);
> filter->SetShrinkFactor(2);
>
>
> Itk::OrientedImage<...>::pointer image2ITKSmall = filter->getOutput();
>
>
> //and back to vtk
> Itk::ImageToVTKImageFilter::Pointer c1 = ...::New(); Itk::ImageToVTKImageFilter::Pointer c2 = ...::New();
>
> C1->setInput(image1ITK);
> //C2->setInput(image2ITK);              //with that the images are aligned
> C2->setInput(image2ITKSmall);           //with that not aligned
>
> //back to vtk and visualize with checkerboard
>
> vtkImageCheckerboard*   Checkerboard= vtkImageCheckerboard::New();
>
> Checkerboard->SetInput(0, C1->getOutput()); SetInput(1,
> Checkerboard->C2->getOutput()); SetNumberOfDivisions(2, 2, 2);
>
> //visualize Checkerboard->getOutput()
> ...
>
>
>
>
>
>
>
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