[Insight-users] how to take into account of pixel size in saving image

[Renaud Isabelle]

Hi,
   
  I have to save an image of 55*239 pixels with spacing as 0.1496*0.01925. 
   
  This seems to be easy. However, the image saved is not taking into account my pixel size but just the number of my pixels. 
   
    ImageType::IndexType start;
  start.Fill(0); 
   
  ImageType::SizeType sz;
  sz[0] = 239; 
  sz[1] = 55;
   
  ImageType::RegionType region;
  region.SetSize( sz );
  region.SetIndex( start );
   
  ImageType::Pointer shifty = ImageType::New();
  shifty->SetRegions( region );
  shifty->Allocate();
   
  ImageType::SpacingType spacing ; 
  spacing[0] = 0.01925; 
  spacing[1] = 0.1496;
  shifty->SetSpacing( spacing );
   
  //compute shifty somehow
   
  typedef itk::RescaleIntensityImageFilter<
  ImageType, WriteImageType > RescaleFilterType;
   
  RescaleFilterType::Pointer rescaler = RescaleFilterType::New();
  rescaler->SetOutputMinimum( 0 );
  rescaler->SetOutputMaximum( 255 );
  rescaler->SetInput( shifty );
   
  typedef itk::ImageFileWriter< WriteImageType > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("shifty.jpg");
  writer->SetInput( rescaler->GetOutput() );
  writer->Update();
   
  By taking into account the pixel size, the saved image should be almost twice heigher than large. However, taking into account only the number of pixels, my saved image is 4 times larger than heigh. 
   
  This is a medical image so my pixel size is very important to be aware of the physical dimensions of the image.
   
  Isabelle
   


		
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