Function main

Examples/ImageRegistrationMethod3/ImageRegistrationMethod3.cxx:60–117

int
main(int argc, char * argv[])
{
  if (argc < 4)
  {
    std::cout << "Usage: " << argv[0] << " <fixedImageFile> <movingImageFile> <outputTransformFile>" << std::endl;
    return 1;
  }

  sitk::Image fixed = sitk::ReadImage(argv[1], sitk::sitkFloat32);
  sitk::Image moving = sitk::ReadImage(argv[2], sitk::sitkFloat32);

  sitk::ImageRegistrationMethod R;

  R.SetMetricAsCorrelation();
  R.SetOptimizerAsRegularStepGradientDescent(2.0,   // learningRate
                                             1e-4,  // minStep
                                             500,   // numberOfIterations
                                             0.5,   // relaxationFactor
                                             1e-8); // gradientMagnitudeTolerance
  R.SetOptimizerScalesFromIndexShift();

  sitk::Transform tx = sitk::CenteredTransformInitializer(fixed, moving, sitk::Similarity2DTransform());
  R.SetInitialTransform(tx);
  R.SetInterpolator(sitk::sitkLinear);

  IterationUpdate cmd(R);
  R.AddCommand(sitk::sitkIterationEvent, cmd);

  sitk::Transform outTx = R.Execute(fixed, moving);

  std::cout << "-------" << std::endl;
  std::cout << outTx.ToString() << std::endl;
  std::cout << "Optimizer stop condition: " << R.GetOptimizerStopConditionDescription() << std::endl;
  std::cout << " Iteration: " << R.GetOptimizerIteration() << std::endl;
  std::cout << " Metric value: " << R.GetMetricValue() << std::endl;

  sitk::WriteTransform(outTx, argv[3]);

  sitk::ResampleImageFilter resampler;
  resampler.SetReferenceImage(fixed);
  resampler.SetInterpolator(sitk::sitkLinear);
  resampler.SetDefaultPixelValue(100);
  resampler.SetTransform(outTx);

  sitk::Image out = resampler.Execute(moving);

  sitk::Image simg1 = sitk::Cast(sitk::RescaleIntensity(fixed), sitk::sitkUInt8);
  sitk::Image simg2 = sitk::Cast(sitk::RescaleIntensity(out), sitk::sitkUInt8);
  sitk::Image cimg = sitk::Compose(simg1, simg2, sitk::Divide(sitk::Add(simg1, simg2), 2));

  if (getenv("SITK_NOSHOW") == nullptr)
  {
    sitk::Show(cimg, "ImageRegistration3 Composition");
  }

  return 0;
}