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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 "itkPrintHelper.h"
using itk::print_helper::operator<<;
#include "itkGTest.h"
#include "itkImage.h"
#include "itkConnectedComponentImageFilter.h"
#include <bitset>
namespace
{
typename itk::Image<unsigned char, 3>::Pointer
CreateTestImageA()
{
std::bitset<8> bits(105); // 3D Checkerboard: 01101001
using namespace itk::GTest::TypedefsAndConstructors::Dimension3;
using PixelType = unsigned char;
using ImageType = itk::Image<PixelType, Dimension>;
auto image = ImageType::New();
image->SetRegions(ImageType::RegionType(itk::MakeSize(2u, 2u, 2u)));
image->AllocateInitialized();
for (size_t i = 0; i < 8; ++i)
{
std::bitset<3> idx(i);
image->SetPixel({ { idx[0], idx[1], idx[2] } }, bits[i]);
}
return image;
}
} // namespace
TEST(ConnectedComponentImageFilter, checkerboard_3D)
{
auto image = CreateTestImageA();
using ImageType = decltype(image)::ObjectType;
auto connected = itk::ConnectedComponentImageFilter<ImageType, ImageType>::New();
connected->SetInput(image);
connected->FullyConnectedOff();
connected->Update();
itk::ImageRegionConstIterator<ImageType> it(connected->GetOutput(),
connected->GetOutput()->GetLargestPossibleRegion());
EXPECT_EQ(it.Get(), 1);
++it;
EXPECT_EQ(it.Get(), 0);
++it;
EXPECT_EQ(it.Get(), 0);
++it;
EXPECT_EQ(it.Get(), 2);
++it;
EXPECT_EQ(it.Get(), 0);
++it;
EXPECT_EQ(it.Get(), 3);
++it;
EXPECT_EQ(it.Get(), 4);
++it;
EXPECT_EQ(it.Get(), 0);
++it;
EXPECT_TRUE(it.IsAtEnd());
}
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