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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 "itkCentralDifferenceImageFunction.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkTestingMacros.h"
int
itkCentralDifferenceImageFunctionSpeedTest(int argc, char * argv[])
{
if (argc != 6)
{
std::cerr << "usage: " << itkNameOfTestExecutableMacro(argv) << " size reps doEAI doEACI doE" << std::endl;
return EXIT_FAILURE;
}
int imageSize = std::stoi(argv[1]);
int reps = std::stoi(argv[2]);
bool doEAI = std::stoi(argv[3]);
bool doEACI = std::stoi(argv[4]);
bool doE = std::stoi(argv[5]);
std::cout << "imageSize: " << imageSize << " reps: " << reps << " doEAI, doEACI, doE: " << doEAI << ", " << doEACI
<< ", " << doE << std::endl;
constexpr unsigned int ImageDimension = 2;
using PixelType = unsigned int;
using ImageType = itk::Image<PixelType, ImageDimension>;
auto image = ImageType::New();
ImageType::SizeType size;
size.Fill(imageSize);
ImageType::RegionType region(size);
image->SetRegions(region);
image->Allocate();
// make a test image
using Iterator = itk::ImageRegionIteratorWithIndex<ImageType>;
Iterator iter(image, region);
iter.GoToBegin();
unsigned int counter = 0;
while (!iter.IsAtEnd())
{
iter.Set(counter);
++counter;
++iter;
}
// set up central difference calculator
using CoordRepType = float;
using FunctionType = itk::CentralDifferenceImageFunction<ImageType, CoordRepType>;
using OutputType = FunctionType::OutputType;
auto function = FunctionType::New();
function->SetInputImage(image);
ImageType::IndexType index;
OutputType total;
total.Fill(0);
std::cout << "UseImageDirection: " << function->GetUseImageDirection() << std::endl;
/// loop
for (int l = 0; l < reps; ++l)
{
iter.GoToBegin();
while (!iter.IsAtEnd())
{
index = iter.GetIndex();
if (doEAI)
{
OutputType indexOutput = function->EvaluateAtIndex(index);
total += indexOutput;
}
if (doEACI)
{
FunctionType::ContinuousIndexType cindex;
cindex[0] = index[0] + 0.1;
cindex[1] = index[1] + 0.1;
OutputType continuousIndexOutput = function->EvaluateAtContinuousIndex(cindex);
total += continuousIndexOutput;
}
if (doE)
{
FunctionType::PointType point;
image->TransformIndexToPhysicalPoint(index, point);
OutputType pointOutput = function->Evaluate(point);
total += pointOutput;
}
++iter;
}
}
std::cout << "total: " << total << std::endl;
return EXIT_SUCCESS;
}
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