Intensity Windowing

Synopsis

Apply a linear intensity transform from a specified input range to a specified output range.

Results

output.png

output.png

Code

C++

#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkIntensityWindowingImageFilter.h"
#include "itkImageRegionIterator.h"

using ImageType = itk::Image<unsigned char, 2>;

static void
CreateImage(ImageType::Pointer image);

int
main(int, char *[])
{
  ImageType::Pointer image = ImageType::New();
  CreateImage(image);

  using IntensityWindowingImageFilterType = itk::IntensityWindowingImageFilter<ImageType, ImageType>;

  IntensityWindowingImageFilterType::Pointer filter = IntensityWindowingImageFilterType::New();
  filter->SetInput(image);
  filter->SetWindowMinimum(0);
  filter->SetWindowMaximum(100);
  filter->SetOutputMinimum(0);
  filter->SetOutputMaximum(255);
  filter->Update();

  using WriterType = itk::ImageFileWriter<ImageType>;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("output.png");
  writer->SetInput(image);
  writer->Update();

  return EXIT_SUCCESS;
}

void
CreateImage(ImageType::Pointer image)
{
  ImageType::IndexType start;
  start.Fill(0);

  ImageType::SizeType size;
  size.Fill(100);

  ImageType::RegionType region(start, size);

  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(10);

  itk::ImageRegionIterator<ImageType> imageIterator(image, region);

  while (!imageIterator.IsAtEnd())
  {
    if (imageIterator.GetIndex()[0] > 30)
    {
      imageIterator.Set(0);
    }

    ++imageIterator;
  }
}

Classes demonstrated