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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 "itkEigenAnalysis2DImageFilter.h"
#include "itkSimpleFilterWatcher.h"
template <unsigned int myDimension = 2,
typename TComputeType = double,
typename myVectorType = itk::Vector<TComputeType, myDimension>>
class EigenAnalysis2DImageFilterTester
{
// Define the dimension of the images
// Declare type for Eigen Vectors
// Declare the types of the images
using myImageType = itk::Image<TComputeType, myDimension>;
using myVectorImageType = itk::Image<myVectorType, myDimension>;
// Declare the type of the index to access images
using myIndexType = itk::Index<myDimension>;
// Declare the type of the size
using mySizeType = itk::Size<myDimension>;
// Declare the type of the Region
using myRegionType = itk::ImageRegion<myDimension>;
// Declare Iterator types apropriated for each image
using myIteratorType = itk::ImageRegionIteratorWithIndex<myImageType>;
using myVectorIteratorType = itk::ImageRegionIteratorWithIndex<myVectorImageType>;
// Declare the Filter
using myFilterType = itk::EigenAnalysis2DImageFilter<myImageType, myImageType, myVectorImageType>;
// Function for image initialization
void
InitializeImage(myImageType * image, double value)
{
typename myImageType::Pointer inputImage(image);
// Define their size, and start index
mySizeType size;
size.Fill(2);
myIndexType start;
start.Fill(0);
myRegionType region{ start, size };
inputImage->SetRegions(region);
inputImage->Allocate();
myIteratorType it(inputImage, inputImage->GetRequestedRegion());
it.GoToBegin();
while (!it.IsAtEnd())
{
it.Set(value);
++it;
}
}
// Function for image printing
void
PrintImage(myImageType * image, const char * text)
{
typename myImageType::Pointer imagePtr(image);
// Create an iterator for going through the image
myIteratorType it(imagePtr, imagePtr->GetRequestedRegion());
it.GoToBegin();
// Print the content of the image
std::cout << text << std::endl;
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
++it;
}
}
// Function for image printing
void
PrintImage(myVectorImageType * image, const char * text)
{
typename myVectorImageType::Pointer imagePtr(image);
// Create an iterator for going through the image
myVectorIteratorType it(imagePtr, imagePtr->GetRequestedRegion());
it.GoToBegin();
// Print the content of the image
std::cout << text << std::endl;
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
++it;
}
}
public:
int
Run()
{
// Create the images
auto inputImageXX = myImageType::New();
auto inputImageXY = myImageType::New();
auto inputImageYY = myImageType::New();
InitializeImage(inputImageXX, std::cos(itk::Math::pi / 6.0));
InitializeImage(inputImageXY, std::sin(itk::Math::pi / 6.0));
InitializeImage(inputImageYY, std::cos(itk::Math::pi / 6.0));
// Create a Filter
auto filter = myFilterType::New();
itk::SimpleFilterWatcher watcher(filter);
// Connect the input images
filter->SetInput1(inputImageXX);
filter->SetInput2(inputImageXY);
filter->SetInput3(inputImageYY);
// Execute the filter
filter->Update();
// Get
typename myImageType::Pointer maxEigenValue = filter->GetMaxEigenValue();
typename myImageType::Pointer minEigenValue = filter->GetMinEigenValue();
typename myVectorImageType::Pointer maxEigenVector = filter->GetMaxEigenVector();
PrintImage(maxEigenValue, "Max Eigen Value");
PrintImage(minEigenValue, "Min Eigen Value");
PrintImage(maxEigenVector, "Max Eigen Vector");
// All objects should be automatically destroyed at this point
return EXIT_SUCCESS;
}
};
int
itkEigenAnalysis2DImageFilterTest(int, char *[])
{
int status = EXIT_SUCCESS;
{
using myComputeType = double;
constexpr unsigned int myDimension = 2;
using myVectorType = itk::Vector<myComputeType, 2>;
auto t1 = EigenAnalysis2DImageFilterTester<myDimension, myComputeType, myVectorType>();
status |= t1.Run();
}
{
using myComputeType = float;
constexpr unsigned int myDimension = 2;
using myVectorType = itk::Vector<myComputeType, 2>;
auto t1 = EigenAnalysis2DImageFilterTester<myDimension, myComputeType, myVectorType>();
status |= t1.Run();
}
{
using myComputeType = float;
constexpr unsigned int myDimension = 3;
using myVectorType = itk::Vector<myComputeType, 2>;
auto t1 = EigenAnalysis2DImageFilterTester<myDimension, myComputeType, myVectorType>();
status |= t1.Run();
}
/* The two test below should cause compilation errors.
{
using myComputeType = float;
constexpr unsigned int myDimension = 3;
<-- ******* error: static assertion failed: Error: PixelType of EigenVector Image must have exactly 2 elements!
using myVectorType = itk::Vector<myComputeType, 3>;
auto t1 = EigenAnalysis2DImageFilterTester<myDimension, myComputeType, myVectorType>();
status |= t1.Run();
}
{
using myComputeType = float;
constexpr unsigned int myDimension = 3;
using myVectorType = std::array<myComputeType, 2>;
<-- ******* error: no type named ‘ValueType’ in ‘using PixelType = struct std::array<float, 2>
auto t1 = EigenAnalysis2DImageFilterTester<myDimension, myComputeType, myVectorType>();
status |= t1.Run();
}
*/
return status;
}
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