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

[Gaetan Lehmann]

Hi Isabelle,

You should try to resample your image with the resample image filters or use 
an image format which store spacing.
There is a chapter about that in the insight software guide.

Regards,

Gaetan


On Wednesday 30 November 2005 23:04, Renaud Isabelle wrote:
> 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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