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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 "itkVectorCentralDifferenceImageFunction.h"
#include "itkImageRegionIterator.h"
int
itkVectorCentralDifferenceImageFunctionTest(int, char *[])
{
constexpr unsigned int ImageDimension = 2;
constexpr unsigned int VectorDimension = 3;
using PixelType = itk::Vector<short, VectorDimension>;
using ImageType = itk::Image<PixelType, ImageDimension>;
auto image = ImageType::New();
ImageType::SizeType size;
size.Fill(16);
ImageType::RegionType region(size);
image->SetRegions(region);
image->Allocate();
// make a test image
using Iterator = itk::ImageRegionIterator<ImageType>;
Iterator iter(image, region);
iter.GoToBegin();
unsigned int counter = 0;
while (!iter.IsAtEnd())
{
iter.Set(counter++);
++iter;
}
// set up central difference calculator
using CoordRepType = float;
using FunctionType = itk::VectorCentralDifferenceImageFunction<ImageType, CoordRepType>;
auto function = FunctionType::New();
function->SetInputImage(image);
ImageType::IndexType index;
// pick an index inside the image
index.Fill(8);
std::cout << "Index: " << index << " Derivative:" << std::endl;
std::cout << function->EvaluateAtIndex(index) << std::endl;
if (function->IsInsideBuffer(index))
{
std::cout << "Index: " << index << " is inside the BufferedRegion." << std::endl;
}
FunctionType::ContinuousIndexType cindex;
cindex.Fill(8.0);
std::cout << "ContinuousIndex: " << cindex << " Derivative:" << std::endl;
std::cout << function->EvaluateAtContinuousIndex(cindex) << std::endl;
FunctionType::PointType point;
point.Fill(8.0);
std::cout << "Point: " << cindex << " Derivative:" << std::endl;
std::cout << function->Evaluate(point) << std::endl;
// pick an index on the image edge
index.Fill(8);
index[0] = 15;
std::cout << "Index: " << index << " Derivative:" << std::endl;
std::cout << function->EvaluateAtIndex(index) << std::endl;
if (function->IsInsideBuffer(index))
{
std::cout << "Index: " << index << " is inside the BufferedRegion." << std::endl;
}
cindex.Fill(8.0);
cindex[0] = 15.0;
std::cout << "ContinuousIndex: " << cindex << " Derivative:" << std::endl;
std::cout << function->EvaluateAtContinuousIndex(cindex) << std::endl;
point.Fill(8.0);
point[0] = 15.0;
std::cout << "Point: " << cindex << " Derivative:" << std::endl;
std::cout << function->Evaluate(point) << std::endl;
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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