Cast an Image to Another Type#
Synopsis#
Cast an Image to another type
Results#

Output image#
Code#
Python#
#!/usr/bin/env python
import itk
import argparse
parser = argparse.ArgumentParser(description="Cast An Image To Another Type.")
parser.add_argument("input_image")
parser.add_argument("output_image")
args = parser.parse_args()
Dimension = 2
InputPixelType = itk.F
OutputPixelType = itk.UC
InputImageType = itk.Image[InputPixelType, Dimension]
OutputImageType = itk.Image[OutputPixelType, Dimension]
reader = itk.ImageFileReader[InputImageType].New()
reader.SetFileName(args.input_image)
rescaler = itk.RescaleIntensityImageFilter[InputImageType, InputImageType].New()
rescaler.SetInput(reader.GetOutput())
rescaler.SetOutputMinimum(0)
outputPixelTypeMaximum = itk.NumericTraits[OutputPixelType].max()
rescaler.SetOutputMaximum(outputPixelTypeMaximum)
castImageFilter = itk.CastImageFilter[InputImageType, OutputImageType].New()
castImageFilter.SetInput(rescaler.GetOutput())
writer = itk.ImageFileWriter[OutputImageType].New()
writer.SetFileName(args.output_image)
writer.SetInput(castImageFilter.GetOutput())
writer.Update()
C++#
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkCastImageFilter.h"
int
main(int argc, char * argv[])
{
if (argc != 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0];
std::cerr << "<InputFileName> <OutputFileName>";
std::cerr << std::endl;
return EXIT_FAILURE;
}
constexpr unsigned int Dimension = 2;
const char * inputImage = argv[1];
const char * outputImage = argv[2];
using InputPixelType = float;
using OutputPixelType = unsigned char;
using InputImageType = itk::Image<InputPixelType, Dimension>;
using OutputImageType = itk::Image<OutputPixelType, Dimension>;
const auto input = itk::ReadImage<InputImageType>(inputImage);
using RescaleType = itk::RescaleIntensityImageFilter<InputImageType, InputImageType>;
auto rescale = RescaleType::New();
rescale->SetInput(input);
rescale->SetOutputMinimum(0);
rescale->SetOutputMaximum(itk::NumericTraits<OutputPixelType>::max());
using FilterType = itk::CastImageFilter<InputImageType, OutputImageType>;
auto filter = FilterType::New();
filter->SetInput(rescale->GetOutput());
try
{
itk::WriteImage(filter->GetOutput(), outputImage);
}
catch (const itk::ExceptionObject & e)
{
std::cerr << "Error: " << e << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
Classes demonstrated#
-
template<typename TInputImage, typename TOutputImage>
class CastImageFilter : public itk::InPlaceImageFilter<TInputImage, TOutputImage> Casts input pixels to output pixel type.
This filter is templated over the input image type and the output image type.
A typical use is to cast a
to aitk::Image<type1, dim>
itk::Image<type2, dim>
This filter can also be used to cast a
to aitk::VectorImage<type1, dim>
itk::VectorImage<type2, dim>
If you need to perform a dimensionaly reduction, you may want to use the ExtractImageFilter instead of the CastImageFilter.
- See
UnaryFunctorImageFilter
- See
ExtractImageFilter
- ITK Sphinx Examples:
Subclassed by itk::GPUImageToImageFilter< TInputImage, TOutputImage, CastImageFilter< TInputImage, TOutputImage > >