[ITK-users] image->GetBufferPointer() and opposite way for 3d images

[alexfd7]

Hello everyone, I have a problem, someone help me?


I'm getting the image buffer. So I want to do the opposite way, import the
buffer (pixelData) back to the image object, I am using importImageFilter
filter to have the original image again. 2D images works very well, however
with 3d images (.nrrd) i'm not getting good result, I get a darker resulting
image than the original.


I thank the attention and the available space for me to post my question


  float* pixelData;       /**< Pointer to image data */


  typedef    float InputPixelType;
  typedef    float OutputPixelType;

  typedef itk::Image<InputPixelType,  3> InputImageType;
  typedef itk::Image<OutputPixelType, 3> OutputImageType;

  typedef itk::ImageFileReader<InputImageType>  ReaderType;
  typedef itk::ImageFileWriter<OutputImageType> WriterType;

  typedef itk::ImportImageFilter< float, 3 >   ImportFilterType;
  ImportFilterType::Pointer importFilter = ImportFilterType::New();

  typename ReaderType::Pointer reader = ReaderType::New();

  reader->SetFileName( inputVolume.c_str() );

  reader->Update();

  typename InputImageType::Pointer image = reader->GetOutput();

  typename InputImageType::RegionType region =
image->GetLargestPossibleRegion();

  typename InputImageType::SizeType size = region.GetSize();

  int sizePixel = (size[0]*size[1]*size[2]);

    pixelData  = (float*)malloc(size[0]*size[1]*size[2] * sizeof(float));
    memcpy( pixelData, image->GetBufferPointer(),
size[0]*size[1]*size[2]*sizeof(float));


  ImportFilterType::SizeType  sizeImport;
        sizeImport[0]  = size[0];  // size along X
        sizeImport[1]  = size[1];  // size along Y
        sizeImport[2]  = size[2];  // size along Y
    ImportFilterType::IndexType start;
        start.Fill( 0 );
    ImportFilterType::RegionType regionImport;
        regionImport.SetIndex( start );
        regionImport.SetSize(  sizeImport  );

    importFilter->SetRegion( regionImport );


    const itk::SpacePrecisionType origin[ 3 ] = { 0.0, 0.0, 0.0};
    importFilter->SetOrigin( origin );

    const itk::SpacePrecisionType  spacing[ 3 ] =  { 1.0, 1.0, 1.0};
    importFilter->SetSpacing( spacing );

    const bool importImageFilterWillOwnTheBuffer = true;
    importFilter->SetImportPointer( pixelData, sizePixel,
                                    importImageFilterWillOwnTheBuffer );

   importFilter->Update();


    typename WriterType::Pointer writer = WriterType::New();
    writer->SetFileName( outputVolume.c_str() );
    writer->SetInput( importFilter->GetOutput() );
    writer->SetUseCompression(1);
    writer->Update();


<http://itk-insight-users.2283740.n2.nabble.com/file/n7588815/original.png> 

<http://itk-insight-users.2283740.n2.nabble.com/file/n7588815/result.png> 




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