Examples/Filtering/ResampleOrientedImageFilter.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 "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkMatrix.h"
 
#include "itkResampleImageFilter.h"
 
int
main(int argc, char * argv[])
{
  if (argc < 7)
  {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << "  inputImageFile  outputImageFile";
    std::cerr << "  direction cosines" << std::endl;
    return EXIT_FAILURE;
  }
 
  constexpr unsigned int Dimension = 2;
  using InputPixelType = unsigned char;
  using OutputPixelType = unsigned char;
  using InputImageType = itk::Image<InputPixelType, Dimension>;
  using OutputImageType = itk::Image<OutputPixelType, Dimension>;
 
  using ReaderType = itk::ImageFileReader<InputImageType>;
  using WriterType = itk::ImageFileWriter<OutputImageType>;
 
  auto reader = ReaderType::New();
  auto writer = WriterType::New();
 
  reader->SetFileName(argv[1]);
  writer->SetFileName(argv[2]);
 
 
  using FilterType =
    itk::ResampleImageFilter<InputImageType, OutputImageType>;
  auto filter = FilterType::New();
 
  filter->SetDefaultPixelValue(0);
 
  {
    // pixel spacing in millimeters
    const double spacing[Dimension] = { 1.0, 1.0 };
    filter->SetOutputSpacing(spacing);
  }
 
  {
    // space coordinate of origin
    const double origin[Dimension] = { 0.0, 0.0 };
    filter->SetOutputOrigin(origin);
  }
 
  OutputImageType::DirectionType direction;
  direction(0, 0) = std::stoi(argv[3]);
  direction(1, 0) = std::stoi(argv[4]);
  direction(0, 1) = std::stoi(argv[5]);
  direction(1, 1) = std::stoi(argv[6]);
  filter->SetOutputDirection(direction);
 
  InputImageType::SizeType size;
  size[0] = 300; // number of pixels along X
  size[1] = 300; // number of pixels along Y
 
  filter->SetSize(size);
  filter->SetInput(reader->GetOutput());
  writer->SetInput(filter->GetOutput());
  writer->Update();
 
  return EXIT_SUCCESS;
}