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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 : BeginLatex
//
// This example introduces the use of the
// \doxygen{AntiAliasBinaryImageFilter}. This filter expect a binary mask as
// input, and using Level Sets it smooths the image by keeping the edge of
// the structure within 1 pixel distance from the original location. It is
// usually desirable to run this filter before extracting isocontour with
// surface extraction methods.
//
// \index{itk::AntiAliasBinaryImageFilter|textbf}
//
// Software Guide : EndLatex
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkCastImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"
// Software Guide : BeginLatex
//
// The first step required for using this filter is to include its header
// file
//
// \index{itk::AntiAliasBinaryImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkAntiAliasBinaryImageFilter.h"
// Software Guide : EndCodeSnippet
int
main(int argc, char * argv[])
{
if (argc < 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImage outputImageDoublePixelType ";
std::cerr << " outputImage8BitsPixelType [RMS] [numberOfIterations]"
<< std::endl;
return EXIT_FAILURE;
}
const char * inputFilename = argv[1];
const char * outputFilename1 = argv[2];
const char * outputFilename2 = argv[3];
double maximumRMSError = 0.01;
unsigned int numberOfIterations = 50;
if (argc > 4)
{
maximumRMSError = std::stod(argv[4]);
}
if (argc > 5)
{
numberOfIterations = std::stoi(argv[5]);
}
using CharPixelType = unsigned char; // IO
using RealPixelType = double; // Operations
constexpr unsigned int Dimension = 3;
using CharImageType = itk::Image<CharPixelType, Dimension>;
using RealImageType = itk::Image<RealPixelType, Dimension>;
using ReaderType = itk::ImageFileReader<CharImageType>;
using WriterType = itk::ImageFileWriter<CharImageType>;
using RealWriterType = itk::ImageFileWriter<RealImageType>;
// Software Guide : BeginLatex
//
// This filter operates on image of pixel type float. It is then necessary
// to cast the type of the input images that are usually of integer type.
// The \doxygen{CastImageFilter} is used here for that purpose. Its image
// template parameters are defined for casting from the input type to the
// float type using for processing.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using CastToRealFilterType =
itk::CastImageFilter<CharImageType, RealImageType>;
// Software Guide : EndCodeSnippet
using RescaleFilter =
itk::RescaleIntensityImageFilter<RealImageType, CharImageType>;
// Software Guide : BeginLatex
//
// The \doxygen{AntiAliasBinaryImageFilter} is instantiated using the float
// image type.
//
// \index{itk::AntiAliasBinaryImageFilter|textbf}
//
// Software Guide : EndLatex
using AntiAliasFilterType =
itk::AntiAliasBinaryImageFilter<RealImageType, RealImageType>;
// Setting the IO
auto reader = ReaderType::New();
auto toReal = CastToRealFilterType::New();
auto rescale = RescaleFilter::New();
// Setting the ITK pipeline filter
// Software Guide : BeginCodeSnippet
auto antiAliasFilter = AntiAliasFilterType::New();
reader->SetFileName(inputFilename);
// The output of an edge filter is 0 or 1
rescale->SetOutputMinimum(0);
rescale->SetOutputMaximum(255);
toReal->SetInput(reader->GetOutput());
antiAliasFilter->SetInput(toReal->GetOutput());
antiAliasFilter->SetMaximumRMSError(maximumRMSError);
antiAliasFilter->SetNumberOfIterations(numberOfIterations);
antiAliasFilter->SetNumberOfLayers(2);
auto realWriter = RealWriterType::New();
realWriter->SetInput(antiAliasFilter->GetOutput());
realWriter->SetFileName(outputFilename1);
try
{
realWriter->Update();
}
catch (const itk::ExceptionObject & err)
{
std::cout << "ExceptionObject caught !" << std::endl;
std::cout << err << std::endl;
return EXIT_FAILURE;
}
auto rescaledWriter = WriterType::New();
rescale->SetInput(antiAliasFilter->GetOutput());
rescaledWriter->SetInput(rescale->GetOutput());
rescaledWriter->SetFileName(outputFilename2);
try
{
rescaledWriter->Update();
}
catch (const itk::ExceptionObject & err)
{
std::cout << "ExceptionObject caught !" << std::endl;
std::cout << err << std::endl;
return EXIT_FAILURE;
}
std::cout << "Completed in " << antiAliasFilter->GetNumberOfIterations()
<< std::endl;
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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