// ------------------------------------------------------------------------
void LoadImage(const std::string &filename, ImageType::Pointer &image)
{
typedef itk::Image<unsigned short, 4> InImageType;
typedef itk::ImageFileReader<InImageType> ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(filename);
reader->SetImageIO(itk::NrrdImageIO::New());
reader->Update();
typedef itk::ExtractImageFilter<InImageType, ImageType> ExtractorType;
ExtractorType::Pointer extractor = ExtractorType::New();
extractor->SetInput(reader->GetOutput());
InImageType::RegionType exRegion = reader->GetOutput()->GetLargestPossibleRegion();
InImageType::SizeType exSize = exRegion.GetSize();
InImageType::IndexType exIndex = exRegion.GetIndex();
exSize[3] = 0;
exIndex[3] = 0;
exRegion.SetSize(exSize);
exRegion.SetIndex(exIndex);
extractor->SetExtractionRegion(exRegion);
extractor->SetDirectionCollapseToSubmatrix();
extractor->Update();
image = extractor->GetOutput();
}
int main(int argc,char ** argv){
typedef itk::Image<float,3> ImageType;
typedef itk::Image<float,2> SliceType;
typedef itk::ImageFileReader<ImageType> ReaderType;
typedef itk::ImageFileWriter<SliceType> WriterType;
typedef itk::BoundedReciprocalImageFilter<ImageType,ImageType> BoundedReciprocalType;
BoundedReciprocalType::Pointer boundedReciprocal = BoundedReciprocalType::New();
typedef ttt::AdvectiveDiffusion2DIterationImageFilter<SliceType,SliceType> AdvectionDiffusion2DIterationType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(argv[1]);
reader->UpdateOutputInformation();
typedef itk::ExtractImageFilter<ImageType,SliceType> ExtractorType;
ExtractorType::Pointer extractor = ExtractorType::New();
ImageType::RegionType extractionRegion = reader->GetOutput()->GetLargestPossibleRegion();
extractionRegion.SetSize(2,0);
boundedReciprocal->SetInput(reader->GetOutput());
extractor->SetInput(boundedReciprocal->GetOutput());
extractor->SetExtractionRegion(extractionRegion);
extractor->SetDirectionCollapseToIdentity();
AdvectionDiffusion2DIterationType::Pointer advectionDiffusionIteration =AdvectionDiffusion2DIterationType::New();
advectionDiffusionIteration->SetInput(extractor->GetOutput());
advectionDiffusionIteration->SetNumberOfThreads(1.0);
WriterType::Pointer sliceWriter = WriterType::New();
sliceWriter->SetInput(extractor->GetOutput());
sliceWriter->SetFileName(argv[2]);
sliceWriter->Update();
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(argv[3]);
writer->SetInput(advectionDiffusionIteration->GetOutput());
writer->Update();
}