Binary OR Two Images

Synopsis

Binary OR two images.

Results

input1.png

input2.png

output.png

Code

C++

#include "itkImage.h"
#include "itkSimpleFilterWatcher.h"
#include "itkOrImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageFileWriter.h"

using ImageType = itk::Image<unsigned char, 2>;
static void
CreateImage1(ImageType::Pointer image);
static void
CreateImage2(ImageType::Pointer image);

int
main(int, char *[])
{
  ImageType::Pointer image1 = ImageType::New();
  CreateImage1(image1);

  using WriterType = itk::ImageFileWriter<ImageType>;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("input1.png");
  writer->SetInput(image1);
  writer->Update();

  ImageType::Pointer image2 = ImageType::New();
  CreateImage2(image2);

  writer->SetFileName("input2.png");
  writer->SetInput(image2);
  writer->Update();

  using OrImageFilterType = itk::OrImageFilter<ImageType>;
  OrImageFilterType::Pointer orFilter = OrImageFilterType::New();
  orFilter->SetInput(0, image1);
  orFilter->SetInput(1, image2);
  orFilter->Update();

  writer->SetFileName("output.png");
  writer->SetInput(orFilter->GetOutput());
  writer->Update();

  return EXIT_SUCCESS;
}

void
CreateImage1(ImageType::Pointer image)
{
  ImageType::IndexType start;
  start.Fill(0);

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

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

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

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

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

    ++imageIterator;
  }
}

void
CreateImage2(ImageType::Pointer image)
{
  ImageType::IndexType start;
  start.Fill(0);

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

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

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

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

  while (!imageIterator.IsAtEnd())
  {
    if (imageIterator.GetIndex()[0] > 30)
    {
      imageIterator.Set(255);
    }
    else
    {
      imageIterator.Set(0);
    }

    ++imageIterator;
  }
}

Classes demonstrated

template<typename TInputImage1, typename TInputImage2 = TInputImage1, typename TOutputImage = TInputImage1>
class OrImageFilter : public itk::BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>

Implements the OR bitwise operator pixel-wise between two images.

This class is templated over the types of the two input images and the type of the output image. Numeric conversions (castings) are done by the C++ defaults.

Since the bitwise OR operation is only defined in C++ for integer types, the images passed to this filter must comply with the requirement of using integer pixel type.

The total operation over one pixel will be

output_pixel = static_cast<OutputPixelType>( input1_pixel | input2_pixel )

Where “|” is the boolean OR operator in C++.

ITK Sphinx Examples:

• All ITK Sphinx Examples

• Binary OR Two Images

See itk::OrImageFilter for additional documentation.