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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 "itkMath.h"
#include "itkNearestNeighborExtrapolateImageFunction.h"
#include "itkImageRegionIterator.h"
#include "itkTestingMacros.h"
/**
* This module tests the functionality of the
* NearestNeighborExtrapolateImageFunction class.
*
*/
int
itkNearestNeighborExtrapolateImageFunctionTest(int, char *[])
{
using CoordRep = double;
constexpr unsigned int ImageDimension = 2;
using PixelType = unsigned char;
constexpr unsigned int VectorDimension = 4;
using VectorPixelType = itk::Vector<PixelType, VectorDimension>;
using ImageType = itk::Image<PixelType, ImageDimension>;
using VectorImageType = itk::Image<VectorPixelType, ImageDimension>;
ImageType::SizeType imageSize;
imageSize[0] = 5;
imageSize[1] = 7;
ImageType::RegionType imageRegion(imageSize);
auto image = ImageType::New();
image->SetRegions(imageRegion);
image->Allocate();
auto vectorimage = VectorImageType::New();
vectorimage->SetRegions(imageRegion);
vectorimage->Allocate();
using Iterator = itk::ImageRegionIterator<ImageType>;
Iterator iter(image, imageRegion);
iter.GoToBegin();
unsigned char counter = 0;
while (!iter.IsAtEnd())
{
iter.Set(counter++);
++iter;
}
using VectorIterator = itk::ImageRegionIterator<VectorImageType>;
VectorIterator vectoriter(vectorimage, imageRegion);
vectoriter.GoToBegin();
counter = 0;
while (!vectoriter.IsAtEnd())
{
VectorPixelType & vectorpixel = vectoriter.Value();
vectorpixel.Fill(counter++);
++vectoriter;
}
// set up the extrapolator
using FunctionType = itk::NearestNeighborExtrapolateImageFunction<ImageType, CoordRep>;
auto function = FunctionType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(function, NearestNeighborExtrapolateImageFunction, ExtrapolateImageFunction);
using VectorFunctionType = itk::NearestNeighborExtrapolateImageFunction<VectorImageType, CoordRep>;
auto vectorfunction = VectorFunctionType::New();
function->SetInputImage(image);
vectorfunction->SetInputImage(vectorimage);
FunctionType::IndexType index;
FunctionType::PointType point;
FunctionType::OutputType value;
FunctionType::OutputType trueValue;
VectorFunctionType::OutputType vectorvalue;
VectorFunctionType::OutputType trueVectorValue;
// evaluate at point inside the image
point[0] = 2.25;
point[1] = 3.25;
value = function->Evaluate(point);
vectorvalue = vectorfunction->Evaluate(point);
trueValue = itk::Math::Round<int>(point[0]) + (itk::Math::Round<int>(point[1])) * static_cast<double>(imageSize[0]);
trueVectorValue.Fill(trueValue);
std::cout << "Point: " << point << " Value: " << value << " Vector Value: " << vectorvalue << std::endl;
if (itk::Math::NotAlmostEquals(value, trueValue))
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
if (vectorvalue != trueVectorValue)
{
std::cout << "Vector Value not the same as trueVectorValue: " << trueVectorValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at point outside the image
point[0] = 2.25;
point[1] = 8.0;
value = function->Evaluate(point);
trueValue = itk::Math::Round<int>(point[0]) + (6.0) * static_cast<double>(imageSize[0]);
std::cout << "Point: " << point << " Value: " << value << std::endl;
if (itk::Math::NotAlmostEquals(value, trueValue))
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at index inside the image
index[0] = 4;
index[1] = 5;
value = function->EvaluateAtIndex(index);
trueValue = static_cast<double>(index[0]) + static_cast<double>(index[1]) * static_cast<double>(imageSize[0]);
std::cout << "Index: " << index << " Value: " << value << std::endl;
if (itk::Math::NotAlmostEquals(value, trueValue))
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at index outside the image
index[0] = 8;
index[1] = -1;
value = function->EvaluateAtIndex(index);
trueValue = static_cast<double>(4) + static_cast<double>(0) * static_cast<double>(imageSize[0]);
std::cout << "Index: " << index << " Value: " << value << std::endl;
if (itk::Math::NotAlmostEquals(value, trueValue))
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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