Add Constant to Every Pixel#

Synopsis#

Add a constant to every pixel in an image.

Results#

Code#

C++#

#include "itkImage.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkAddImageFilter.h"
#include "itkImageFileWriter.h"

using ImageType = itk::Image<unsigned char, 2>;
static void
CreateImage(ImageType::Pointer image);

int
main()
{
  auto image = ImageType::New();
  CreateImage(image);

  using AddImageFilterType = itk::AddImageFilter<ImageType, ImageType, ImageType>;
  auto addImageFilter = AddImageFilterType::New();
  addImageFilter->SetInput(image);
  addImageFilter->SetConstant2(2);
  addImageFilter->Update();

  itk::WriteImage(addImageFilter->GetOutput(), "output.png");

  return EXIT_SUCCESS;
}

void
CreateImage(ImageType::Pointer image)
{
  ImageType::IndexType start{};

  auto size = ImageType::SizeType::Filled(100);

  ImageType::RegionType region;
  region.SetSize(size);
  region.SetIndex(start);

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

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

  while (!imageIterator.IsAtEnd())
  {
    if (imageIterator.GetIndex()[0] < 70)
    {
      imageIterator.Set(255);
    }
    else
    {
      imageIterator.Set(0);
    }

    ++imageIterator;
  }
}

Classes demonstrated#

Warning

doxygenclass: Cannot find class “itk::AddImageFilter” in doxygen xml output for project “ITK” from directory: /home/runner/work/bld/ITKEx-build/ITKDoxygenXML

See itk::AddImageFilter for additional documentation.