[ITK-users] In-place extraction of N-1 dimensional images from N dimensional images

[Wood, Tobias]

Hello Dženan,

I have had the same problem as Edwin with ExtractImageFilter, but in a different context. Eventually I gave up and accepted the speed/memory penalty of copying the 3D volumes out of the 4D series. Is there really no way in ITK to get a temporary “view” of a subregion for processing, without resorting to referencing the raw arrays?

Thanks,
Toby

On 28/07/2016, 13:40, "Insight-users on behalf of Dženan Zukić" <insight-users-bounces at itk.org on behalf of dzenanz at gmail.com> wrote:

    
    Hi Edwin,
    
    
    you should be able to achieve your goal using 
    import image filter <http://www.vtk.org/doc/nightly/html/classvtkImageImport.html#details>. ITK has import image filter 
    too <https://itk.org/Doxygen/html/classitk_1_1ImportImageFilter.html>, so you can decide in which library to do dimensional reduction.
    
    
    Regards,
    Dženan
    
    
    On Thu, Jul 28, 2016 at 4:37 AM, Edwin Bennink 
    <hebennink at gmail.com> wrote:
    
    Hello,
    
    
    I am working on an ITK/VTK viewer for visualizing 3D+time image data. The data is represented by 4D images in ITK (x,y,z,t). I would like to be able to access the 3D data in VTK without copying it, since that would slow down scrolling through time in large
     datasets. I noticed that, although in-place extraction should be possible, the ExtractImageFilter 'says no' to in-place extraction when the input and output dimensions differ. Does anyone know a way to achieve my goal using existing ITK functions? For example,
     if there would be some way of reducing the dimension of 'flat' images, i.e. 3D (Nx,Ny,1) to 2D (Nx, Ny), then I could still use the ExtractImageFilter.
    
    
    Best,
    Edwin
    
    
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