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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 "itkImageRegionConstIteratorWithIndex.h"
#include "itkSimpleFilterWatcher.h"
#include "itkTestingMacros.h"
int
itkConnectedComponentImageFilterBackgroundTest(int argc, char * argv[])
{
if (argc < 2)
{
std::cout << "Usage: " << itkNameOfTestExecutableMacro(argv) << " <background value>\n";
return EXIT_FAILURE;
}
using PixelType = int;
constexpr unsigned int Dimension = 2;
using ImageType = itk::Image<PixelType, Dimension>;
auto background = static_cast<PixelType>(std::stoi(argv[1]));
// Create an image with an arbitrary background value and a number
// of islands with pixel values above and below the background value
auto image = ImageType::New();
ImageType::SizeType size;
size.Fill(512);
image->SetRegions(size);
image->Allocate();
image->FillBuffer(0);
// Set up islands
ImageType::IndexType index1;
index1[0] = 10;
index1[1] = 11;
image->SetPixel(index1, 1);
ImageType::IndexType index2;
index2[0] = 100;
index2[1] = 101;
image->SetPixel(index2, 2);
// Instantiate and run the filter
using FilterType = itk::ConnectedComponentImageFilter<ImageType, ImageType>;
auto filter = FilterType::New();
filter->SetBackgroundValue(background);
filter->SetInput(image);
itk::SimpleFilterWatcher watcher(filter);
try
{
filter->Update();
}
catch (const itk::ExceptionObject & excep)
{
std::cerr << "exception caught:" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
if (filter->GetObjectCount() != 2)
{
std::cerr << "Expected 2 objects, got " << filter->GetObjectCount() << " instead.\n";
}
ImageType * output = filter->GetOutput();
using IteratorType = itk::ImageRegionConstIteratorWithIndex<ImageType>;
IteratorType iterator(output, output->GetLargestPossibleRegion());
while (!iterator.IsAtEnd())
{
PixelType value = iterator.Get();
ImageType::IndexType index = iterator.GetIndex();
if (index == index1 || index == index2)
{
// Check that objects don't have the background value
if (value == background)
{
std::cerr << "Pixel at index " << index << " has background value "
<< "but should have an object label instead.\n";
return EXIT_FAILURE;
}
}
else
{
if (value != background)
{
std::cerr << "Pixel at index " << index << " has value " << value
<< " but should have bacground value: " << background << '\n';
return EXIT_FAILURE;
}
}
++iterator;
}
return EXIT_SUCCESS;
}
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