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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.
*
*=========================================================================*/
#include "itkConnectedComponentImageFilter.h"
#include "itkRelabelComponentImageFilter.h"
#include "itkBinaryThresholdImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkSimpleFilterWatcher.h"
#include "vnl/vnl_sample.h"
#include "itkTestingMacros.h"
int
itkConnectedComponentImageFilterTest(int argc, char * argv[])
{
if (argc < 5)
{
std::cerr << "Missing Parameters " << std::endl;
std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv);
std::cerr << " inputImage outputImage threshold_low threshold_hi [fully_connected] [minimum_object_size]"
<< std::endl;
return EXIT_FAILURE;
}
using InternalPixelType = unsigned short;
constexpr unsigned int Dimension = 2;
using InternalImageType = itk::Image<InternalPixelType, Dimension>;
using OutputImageType = itk::Image<unsigned short, Dimension>;
using RGBPixelType = itk::RGBPixel<unsigned char>;
using RGBImageType = itk::Image<RGBPixelType, Dimension>;
using ReaderType = itk::ImageFileReader<InternalImageType>;
using WriterType = itk::ImageFileWriter<RGBImageType>;
using ThresholdFilterType = itk::BinaryThresholdImageFilter<InternalImageType, InternalImageType>;
using FilterType = itk::ConnectedComponentImageFilter<InternalImageType, OutputImageType>;
using RelabelType = itk::RelabelComponentImageFilter<OutputImageType, OutputImageType>;
auto reader = ReaderType::New();
auto writer = WriterType::New();
auto threshold = ThresholdFilterType::New();
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, ConnectedComponentImageFilter, ImageToImageFilter);
auto relabel = RelabelType::New();
itk::SimpleFilterWatcher watcher(filter);
watcher.QuietOn();
reader->SetFileName(argv[1]);
InternalPixelType threshold_low, threshold_hi;
threshold_low = std::stoi(argv[3]);
threshold_hi = std::stoi(argv[4]);
threshold->SetInput(reader->GetOutput());
threshold->SetInsideValue(itk::NumericTraits<InternalPixelType>::OneValue());
threshold->SetOutsideValue(InternalPixelType{});
threshold->SetLowerThreshold(threshold_low);
threshold->SetUpperThreshold(threshold_hi);
threshold->Update();
filter->SetInput(threshold->GetOutput());
bool fullyConnected = false;
if (argc > 5)
{
fullyConnected = static_cast<bool>(std::stoi(argv[5]));
}
ITK_TEST_SET_GET_BOOLEAN(filter, FullyConnected, fullyConnected);
typename FilterType::OutputPixelType backgroundValue{};
filter->SetBackgroundValue(backgroundValue);
ITK_TEST_SET_GET_VALUE(backgroundValue, filter->GetBackgroundValue());
ITK_TRY_EXPECT_NO_EXCEPTION(filter->Update());
std::cout << "ConnectedComponent filter ObjectCount: " << filter->GetObjectCount() << std::endl;
relabel->SetInput(filter->GetOutput());
if (argc > 6)
{
int minSize = std::stoi(argv[6]);
relabel->SetMinimumObjectSize(minSize);
std::cerr << "minSize: " << minSize << std::endl;
}
try
{
relabel->Update();
}
catch (const itk::ExceptionObject & excep)
{
std::cerr << "Relabel: exception caught !" << std::endl;
std::cerr << excep << std::endl;
}
// Remap the labels to viewable colors
auto colored = RGBImageType::New();
colored->SetRegions(filter->GetOutput()->GetBufferedRegion());
colored->Allocate();
unsigned short numObjects = relabel->GetNumberOfObjects();
std::vector<RGBPixelType> colormap;
RGBPixelType px;
colormap.resize(numObjects + 1);
vnl_sample_reseed(1031571);
for (auto & i : colormap)
{
px.SetRed(static_cast<unsigned char>(255 * vnl_sample_uniform(0.3333, 1.0)));
px.SetGreen(static_cast<unsigned char>(255 * vnl_sample_uniform(0.3333, 1.0)));
px.SetBlue(static_cast<unsigned char>(255 * vnl_sample_uniform(0.3333, 1.0)));
i = px;
}
itk::ImageRegionIterator<OutputImageType> it(relabel->GetOutput(), relabel->GetOutput()->GetBufferedRegion());
itk::ImageRegionIterator<RGBImageType> cit(colored, colored->GetBufferedRegion());
while (!it.IsAtEnd())
{
if (it.Get() == 0)
{
cit.Set(RGBPixelType());
}
else
{
cit.Set(colormap[it.Get()]);
}
++it;
++cit;
}
try
{
writer->SetInput(colored);
writer->SetFileName(argv[2]);
writer->Update();
}
catch (const itk::ExceptionObject & excep)
{
std::cerr << "Exception caught !" << std::endl;
std::cerr << excep << std::endl;
}
return EXIT_SUCCESS;
}
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