SphinxExamples/src/Filtering/ImageGrid/ChangeImageOriginSpacingOrDirection/Code.cxx

/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
 
#include "itkImageFileReader.h"
#include "itkVersor.h"
#include "itkChangeInformationImageFilter.h"
 
int
main(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Usage: " << argv[0] << " <inputFileName>"
              << " [scalingFactor]"
              << " [translationX translationY translationZ]"
              << " [rotationZinDegrees]" << std::endl;
    return EXIT_FAILURE;
  }
 
  const char * inputFileName = argv[1];
  double       scalingFactor = 1.0;
  if (argc > 3)
  {
    scalingFactor = std::stod(argv[3]);
  }
  double translationX = 0.0;
  if (argc > 3)
  {
    translationX = std::stod(argv[3]);
  }
  double translationY = 0.0;
  if (argc > 4)
  {
    translationY = std::stod(argv[4]);
  }
  double translationZ = 0.0;
  if (argc > 5)
  {
    translationZ = std::stod(argv[5]);
  }
  double rotationZ = 0.0;
  if (argc > 6)
  {
    rotationZ = std::stod(argv[6]);
  }
 
  constexpr unsigned int Dimension = 3;
 
  using PixelType = unsigned char;
  using ImageType = itk::Image<PixelType, Dimension>;
 
  using ReaderType = itk::ImageFileReader<ImageType>;
  auto reader = ReaderType::New();
  reader->SetFileName(inputFileName);
  try
  {
    reader->UpdateOutputInformation();
  }
  catch (const itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
  ImageType::ConstPointer inputImage = reader->GetOutput();
  std::cout << "Original image: " << inputImage << std::endl;
 
  using FilterType = itk::ChangeInformationImageFilter<ImageType>;
  auto filter = FilterType::New();
  filter->SetInput(reader->GetOutput());
 
  const ImageType::SpacingType spacing(scalingFactor);
  filter->SetOutputSpacing(spacing);
  filter->ChangeSpacingOn();
 
  ImageType::PointType::VectorType translation;
  translation[0] = translationX;
  translation[1] = translationY;
  translation[2] = translationZ;
  ImageType::PointType origin = inputImage->GetOrigin();
  origin += translation;
  filter->SetOutputOrigin(origin);
  filter->ChangeOriginOn();
 
  itk::Versor<double> rotation;
  const double        angleInRadians = rotationZ * itk::Math::pi / 180.0;
  rotation.SetRotationAroundZ(angleInRadians);
  const ImageType::DirectionType direction = inputImage->GetDirection();
  const ImageType::DirectionType newDirection = direction * rotation.GetMatrix();
  filter->SetOutputDirection(newDirection);
  filter->ChangeDirectionOn();
 
  try
  {
    filter->UpdateOutputInformation();
  }
  catch (const itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
  std::cout << "**************************************" << std::endl;
  ImageType::ConstPointer output = filter->GetOutput();
  std::cout << "Changed image: " << output << std::endl;
 
  return EXIT_SUCCESS;
}