common/vvFromITK.h

   1 /*=========================================================================
   2   Program:   vv                     http://www.creatis.insa-lyon.fr/rio/vv
   3
   4   Authors belong to:
   5   - University of LYON              http://www.universite-lyon.fr/
   6   - Léon Bérard cancer center       http://www.centreleonberard.fr
   7   - CREATIS CNRS laboratory         http://www.creatis.insa-lyon.fr
   8
   9   This software is distributed WITHOUT ANY WARRANTY; without even
  10   the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  11   PURPOSE.  See the copyright notices for more information.
  12
  13   It is distributed under dual licence
  14
  15   - BSD        See included LICENSE.txt file
  16   - CeCILL-B   http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html
  17 ===========================================================================**/
  18 #ifndef VVIMAGEFROMITK_H
  19 #define VVIMAGEFROMITK_H
  20
  21 // vv
  22 #include "vvImage.h"
  23
  24 // itk
  25 #include <itkExtractImageFilter.h>
  26
  27 //------------------------------------------------------------------------------
  28 /**Converts the itk image to vv, handling the 4D problem
  29  * The time_sequence boolean specifies that the image is to be interpreted as a time sequence,
  30  * even if its dim is < 4. */
  31
  32 template<unsigned int Dim, class PixelType>
  33 static inline void ReadTimeSequence (vvImage::Pointer& vv_image, typename itk::Image<PixelType,Dim>::Pointer input, bool time_sequence=false)
  34 {
  35   typedef itk::Image< PixelType, Dim > InputImageType;
  36   typedef itk::Image< PixelType,  Dim - 1 >    ItkImageType;
  37   typedef itk::ExtractImageFilter<InputImageType, ItkImageType> FilterType;
  38
  39   //extract the 3D slices and put them in a std::vector<vtkImageData*>
  40   input->UpdateOutputInformation();
  41   typename InputImageType::RegionType inputRegion = input->GetLargestPossibleRegion();
  42   typename InputImageType::SizeType inputSize = inputRegion.GetSize();
  43   typename InputImageType::IndexType start = inputRegion.GetIndex();
  44   typename InputImageType::SizeType extractedRegionSize = inputSize;
  45   typename InputImageType::RegionType extractedRegion;
  46   extractedRegionSize[Dim - 1] = 0;
  47   extractedRegion.SetSize(extractedRegionSize);
  48
  49   for (unsigned int i = 0; i < inputSize[Dim - 1]; i++) {
  50     start[Dim - 1] = i;
  51     extractedRegion.SetIndex(start);
  52
  53     typename FilterType::Pointer filter = FilterType::New();
  54     filter->SetDirectionCollapseToSubmatrix();
  55     filter->SetExtractionRegion(extractedRegion);
  56     filter->SetInput(input);
  57     filter->ReleaseDataFlagOn();
  58     vv_image->AddItkImage<ItkImageType>(filter->GetOutput());
  59     vv_image->ComputeScalarRangeBase<PixelType, Dim-1>(filter->GetOutput());
  60   }
  61   vv_image->SetTimeSpacing(input->GetSpacing()[Dim-1]);
  62   vv_image->SetTimeOrigin(input->GetOrigin()[Dim-1]);
  63 }
  64
  65 template<unsigned int Dim, class PixelType>
  66 struct vvImageFromITK_Impl
  67 {
  68   static vvImage::Pointer Do (typename itk::Image<PixelType,Dim>::Pointer input, bool time_sequence=false)
  69   {
  70     vvImage::Pointer vv_image=vvImage::New();
  71     typedef itk::Image< PixelType, Dim > InputImageType;
  72
  73     if (time_sequence) //The time sequence case: create a series of VTK images
  74       ReadTimeSequence<Dim,PixelType>(vv_image, input, time_sequence);
  75     else { //Dim == 1,2,3 and not time_sequence
  76       vv_image->AddItkImage<InputImageType>(input);
  77       vv_image->ComputeScalarRangeBase<PixelType, Dim>(input);
  78     }
  79     return vv_image;
  80   }
  81 };
  82
  83 template<class PixelType>
  84 struct vvImageFromITK_Impl<4u, PixelType>
  85 {
  86   static vvImage::Pointer Do (typename itk::Image<PixelType,4u>::Pointer input, bool time_sequence=false)
  87   {
  88     vvImage::Pointer vv_image = vvImage::New();
  89     ReadTimeSequence<4u,PixelType>(vv_image, input, time_sequence);
  90     return vv_image;
  91   }
  92 };
  93
  94 template<unsigned int Dim, class PixelType> vvImage::Pointer vvImageFromITK(typename itk::Image<PixelType,Dim>::Pointer input, bool time_sequence=false)
  95 {
  96     assert(Dim < 5 && Dim > 0); // We don't handle anything higher than 4-dimensional (for the moment :-p)
  97     return vvImageFromITK_Impl<Dim, PixelType>::Do(input, time_sequence);
  98 }
  99 //------------------------------------------------------------------------------
 100
 101 #endif //vvImageFromITK