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/*=========================================================================
*
* 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.
*
*=========================================================================*/
// Software Guide : BeginCodeSnippet
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkVectorIndexSelectionCastImageFilter.h"
#include "itkRGBPixel.h"
// Software Guide : EndCodeSnippet
#include "itkImage.h"
int
main(int argc, char * argv[])
{
// Verify the number of parameters in the command line
if (argc < 4)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile component"
<< std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginCodeSnippet
using InputPixelType = itk::RGBPixel<unsigned char>;
using OutputPixelType = unsigned char;
constexpr unsigned int Dimension = 2;
using InputImageType = itk::Image<InputPixelType, Dimension>;
using OutputImageType = itk::Image<OutputPixelType, Dimension>;
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
using ReaderType = itk::ImageFileReader<InputImageType>;
using FilterType =
itk::VectorIndexSelectionCastImageFilter<InputImageType, OutputImageType>;
using WriterType = itk::ImageFileWriter<OutputImageType>;
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
auto filter = FilterType::New();
filter->SetIndex(std::stoi(argv[3]));
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Then, we create the reader and writer and connect the pipeline.
//
// \index{itk::ImageFileReader!New()}
// \index{itk::ImageFileWriter!New()}
// \index{itk::ImageFileReader!SmartPointer}
// \index{itk::ImageFileWriter!SmartPointer}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
auto reader = ReaderType::New();
auto writer = WriterType::New();
filter->SetInput(reader->GetOutput());
writer->SetInput(filter->GetOutput());
// Software Guide : EndCodeSnippet
//
// Here we recover the file names from the command line arguments
//
const char * inputFilename = argv[1];
const char * outputFilename = argv[2];
// Software Guide : BeginCodeSnippet
reader->SetFileName(inputFilename);
writer->SetFileName(outputFilename);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Finally we trigger the execution of the pipeline with the Update()
// method on the writer. The output image will then be the scaled and cast
// version of the input image.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
try
{
writer->Update();
}
catch (const itk::ExceptionObject & err)
{
std::cout << "ExceptionObject caught !" << std::endl;
std::cout << err << std::endl;
return EXIT_FAILURE;
}
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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