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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.
*
*=========================================================================*/
#define ITK_LEGACY_TEST
#include "itkGTest.h"
#include "itkBSplineTransform.h"
#include "itkImageRegionConstIterator.h"
namespace
{
// Method which checks that two BSpline are exactly equal
template <typename TParametersValueType, unsigned int VDimension, unsigned int VSplineOrder>
void
bspline_eq(const itk::BSplineTransform<TParametersValueType, VDimension, VSplineOrder> * bspline1,
const itk::BSplineTransform<TParametersValueType, VDimension, VSplineOrder> * bspline2,
const std::string & description = "",
double tolerance = 1e-15)
{
using BSplineType = itk::BSplineTransform<TParametersValueType, VDimension, VSplineOrder>;
// Compare Transform Domain interface
EXPECT_EQ(bspline1->GetNumberOfFixedParameters(), bspline2->GetNumberOfFixedParameters()) << description;
ITK_EXPECT_VECTOR_NEAR(bspline1->GetTransformDomainOrigin(), bspline2->GetTransformDomainOrigin(), tolerance)
<< description;
EXPECT_EQ(bspline1->GetTransformDomainDirection(), bspline2->GetTransformDomainDirection()) << description;
EXPECT_EQ(bspline1->GetTransformDomainMeshSize(), bspline2->GetTransformDomainMeshSize()) << description;
ITK_EXPECT_VECTOR_NEAR(
bspline1->GetTransformDomainPhysicalDimensions(), bspline2->GetTransformDomainPhysicalDimensions(), tolerance)
<< description;
// check transform parameters interface
ITK_EXPECT_VECTOR_NEAR(bspline1->GetParameters(), bspline2->GetParameters(), tolerance) << description;
ITK_EXPECT_VECTOR_NEAR(bspline1->GetFixedParameters(), bspline2->GetFixedParameters(), tolerance) << description;
ASSERT_EQ(bspline1->GetCoefficientImages().Size(), VDimension) << description;
ASSERT_EQ(bspline2->GetCoefficientImages().Size(), VDimension) << description;
for (unsigned int i = 0; i < VDimension; ++i)
{
using ImageType = typename BSplineType::ImageType;
using ImageConstIterator = typename itk::ImageRegionConstIterator<ImageType>;
typename ImageType::Pointer coeffImage1 = bspline1->GetCoefficientImages()[i];
typename ImageType::Pointer coeffImage2 = bspline2->GetCoefficientImages()[i];
ITK_EXPECT_VECTOR_NEAR(coeffImage1->GetOrigin(), coeffImage2->GetOrigin(), tolerance) << description;
EXPECT_EQ(coeffImage1->GetDirection(), coeffImage2->GetDirection()) << description;
ITK_EXPECT_VECTOR_NEAR(coeffImage1->GetSpacing(), coeffImage2->GetSpacing(), tolerance) << description;
EXPECT_EQ(coeffImage1->GetLargestPossibleRegion(), coeffImage2->GetLargestPossibleRegion()) << description;
EXPECT_EQ(coeffImage1->GetBufferedRegion(), coeffImage2->GetBufferedRegion()) << description;
ImageConstIterator iter1(coeffImage1, coeffImage1->GetBufferedRegion());
ImageConstIterator iter2(coeffImage2, coeffImage2->GetBufferedRegion());
while (!iter1.IsAtEnd() && iter2.IsAtEnd())
{
EXPECT_EQ(iter1.Get(), iter2.Get()) << description << " Expected value at: " << iter1.GetIndex();
++iter1;
++iter2;
}
}
}
} // namespace
TEST(ITKBSplineTransform, Construction)
{
using BSplineType = itk::BSplineTransform<double, 3, 3>;
auto bspline1 = BSplineType::New();
auto bspline2 = BSplineType::New();
bspline_eq(bspline1.GetPointer(), bspline1.GetPointer());
bspline_eq(bspline2.GetPointer(), bspline2.GetPointer());
bspline_eq(bspline1.GetPointer(), bspline2.GetPointer());
bspline_eq(bspline2.GetPointer(), bspline1.GetPointer());
}
TEST(ITKBSplineTransform, Copying_Clone)
{
// This test sets up an non-trivial bspline transform then,
// test various interface to set the parameters to the a new
// transform. It validates that the result it the same as the initial
using namespace itk::GTest::TypedefsAndConstructors::Dimension2;
using BSplineType = itk::BSplineTransform<double, 2, 3>;
using ImageType = typename BSplineType::ImageType;
using ImageIterator = typename itk::ImageRegionIterator<ImageType>;
typename BSplineType::CoefficientImageArray coeffImageArray;
ASSERT_EQ(coeffImageArray.Size(), 2);
SizeType imageSize = itk::MakeSize(10, 10);
DirectionType imageDirection; // filled with zeros
imageDirection(0, 1) = -1;
imageDirection(1, 0) = 1;
VectorType imageSpacing = itk::MakeVector(1.1, 1.2);
PointType imageOrigin = itk::MakePoint(0.9, 0.8);
coeffImageArray[0] = ImageType::New();
unsigned short px_value = 3;
ImageType::Pointer coeffImage;
for (unsigned int i = 0; i < Dimension; ++i)
{
coeffImageArray[i] = ImageType::New();
coeffImage = coeffImageArray[i];
coeffImage->SetRegions(RegionType(imageSize));
coeffImage->SetSpacing(imageSpacing);
coeffImage->SetOrigin(imageOrigin);
coeffImage->SetDirection(imageDirection);
coeffImage->Allocate();
ImageIterator iter(coeffImage, coeffImage->GetBufferedRegion());
while (!iter.IsAtEnd())
{
iter.Set(px_value++);
++iter;
}
}
auto bspline1 = BSplineType::New();
bspline1->SetCoefficientImages(coeffImageArray);
bspline_eq(bspline1.GetPointer(), bspline1.GetPointer(), "Check after initialization by coefficient images.");
ITK_EXPECT_VECTOR_NEAR(bspline1->GetTransformDomainOrigin(), itk::MakePoint(-0.3, 1.9), 1e-15);
EXPECT_EQ(bspline1->GetTransformDomainDirection(), imageDirection);
EXPECT_EQ(bspline1->GetTransformDomainMeshSize(), itk::MakeSize(7, 7));
ITK_EXPECT_VECTOR_NEAR(bspline1->GetTransformDomainPhysicalDimensions(), itk::MakeVector(7.7, 8.4), 1e-15);
auto bspline2 = BSplineType::New();
bspline2->SetFixedParameters(bspline1->GetFixedParameters());
bspline2->SetParameters(bspline1->GetParameters());
bspline_eq(bspline1.GetPointer(), bspline2.GetPointer(), "Copying by parameters.");
bspline2 = BSplineType::New();
bspline2->SetTransformDomainOrigin(bspline1->GetTransformDomainOrigin());
bspline2->SetTransformDomainPhysicalDimensions(bspline1->GetTransformDomainPhysicalDimensions());
bspline2->SetTransformDomainDirection(bspline1->GetTransformDomainDirection());
bspline2->SetTransformDomainMeshSize(bspline1->GetTransformDomainMeshSize());
bspline2->SetParameters(bspline1->GetParameters());
bspline_eq(bspline1.GetPointer(), bspline2.GetPointer(), "Set by transform domain then by parameters.");
bspline2 = bspline1->Clone();
bspline_eq(bspline1.GetPointer(), bspline2.GetPointer(), "Clone");
}
TEST(ITKBSplineTransform, NumberOfWeights)
{
const auto testNumberOfWeights = [](const auto & bsplineTransform) {
using BSplineTransformType = std::remove_reference_t<decltype(bsplineTransform)>;
constexpr auto actualNumberOfWeights = BSplineTransformType::NumberOfWeights;
#ifndef ITK_LEGACY_REMOVE
EXPECT_EQ(actualNumberOfWeights, bsplineTransform.GetNumberOfWeights());
#endif
// Expect the actual value of `NumberOfWeights` to be equal to the value of `m_NumberOfWeights` from ITK 5.2 (before
// the introduction of `BSplineTransform::NumberOfWeights`), as was originally initialized at
// https://github.com/InsightSoftwareConsortium/ITK/blob/v5.2.0/Modules/Core/Common/include/itkBSplineInterpolationWeightFunction.hxx#L35
EXPECT_EQ(actualNumberOfWeights,
static_cast<unsigned int>(std::pow(static_cast<double>(BSplineTransformType::SplineOrder + 1),
static_cast<double>(BSplineTransformType::SpaceDimension))));
};
testNumberOfWeights(*itk::BSplineTransform<>::New());
testNumberOfWeights(*itk::BSplineTransform<float>::New());
testNumberOfWeights(*itk::BSplineTransform<float, 2>::New());
testNumberOfWeights(*itk::BSplineTransform<float, 2, 2>::New());
}
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