SphinxExamples/src/Core/Common/ReRunPipelineWithChangingLargestPossibleRegion/Code.cxx

/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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
 *
 *         http://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 "itkImageSeriesReader.h"
#include "itkNumericSeriesFileNames.h"

int main( int argc, char* argv[] )
{
  if( argc != 4 )
    {
    std::cerr << "Usage: "<< std::endl;
    std::cerr << argv[0];
    std::cerr << " <seriesFormat> <startIndex> <endIndex>";
    std::cerr << std::endl;
    return EXIT_FAILURE;
    }

  const char * seriesFormat = argv[1];
  unsigned int startIndex = atoi( argv[2] );
  unsigned int endIndex = atoi( argv[3] );

  constexpr unsigned int Dimension = 3;

  using PixelType = unsigned char;
  using ImageType = itk::Image< PixelType, Dimension >;

  using NameGeneratorType = itk::NumericSeriesFileNames;
  NameGeneratorType::Pointer nameGenerator = NameGeneratorType::New();
  nameGenerator->SetSeriesFormat( seriesFormat );
  nameGenerator->SetStartIndex( startIndex );
  nameGenerator->SetEndIndex( endIndex );
  std::vector< std::string > fileNames = nameGenerator->GetFileNames();

  using ReaderType = itk::ImageSeriesReader< ImageType >;
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileNames( fileNames );

  try
    {
    reader->Update();

    ImageType::ConstPointer output = reader->GetOutput();
    const ImageType::RegionType largestRegion =
      output->GetLargestPossibleRegion();
    std::cout << "Initial LargestPossibleRegion: ";
    std::cout << largestRegion << std::endl;;
    }
  catch( itk::ExceptionObject & error )
    {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
    }

  fileNames.pop_back();

  try
    {
    std::cout << "\nTrying to call Update() "
              << "after shrinking the LargestPossibleRegion...\n" << std::endl;
    reader->SetFileNames( fileNames );
    reader->Update();
    }
  catch( itk::ExceptionObject & error )
    {
    // Print out the error that occurs
    std::cout << "Error: " << error << std::endl;
    }

  try
    {
    std::cout << "Trying to call UpdateLargestPossibleRegion() "
              << "after shrinking the LargestPossibleRegion...\n" << std::endl;
    reader->SetFileNames( fileNames );
    reader->UpdateLargestPossibleRegion();

    ImageType::ConstPointer output = reader->GetOutput();
    const ImageType::RegionType largestRegion =
      output->GetLargestPossibleRegion();
    std::cout << "Shrunk LargestPossibleRegion: ";
    std::cout << largestRegion << std::endl;;
    }
  catch( itk::ExceptionObject & error )
    {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
    }

  return EXIT_SUCCESS;
}