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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.
*
*=========================================================================*/
/**
*
* This program illustrates the AdaptImageFilter
*
* The example shows how an Accessor can be used to
* convert an Vector image to an image that has
* just a single component.
*
* That will allow to pass a component of the
* image as input any filter that expects
* a float image
*
*/
#include "itkAdaptImageFilter.h"
#include "itkNthElementPixelAccessor.h"
#include "vnl/vnl_sample.h"
#include "itkMath.h"
//-------------------------------------
// Typedefs for convenience
//-------------------------------------
using myVectorImageType = itk::Image<itk::Vector<float, 3>, 2>;
using myVectorIteratorType = itk::ImageRegionIteratorWithIndex<myVectorImageType>;
using myAccessorType = itk::NthElementPixelAccessor<float, itk::Vector<float, 3>>;
using myImageType = itk::Image<float, 2>;
using myIteratorType = itk::ImageRegionIteratorWithIndex<myImageType>;
//-------------------------
//
// Main code
//
//-------------------------
int
itkAdaptImageFilterTest2(int, char *[])
{
myVectorImageType::SizeType size;
size[0] = 2;
size[1] = 2;
myVectorImageType::IndexType index;
index[0] = 0;
index[1] = 0;
myVectorImageType::RegionType region{ index, size };
auto myImage = myVectorImageType::New();
myImage->SetRegions(region);
myImage->Allocate();
myVectorIteratorType it1(myImage, myImage->GetRequestedRegion());
// Value to initialize the pixels
myVectorImageType::PixelType color;
// Initializing all the pixel in the image
it1.GoToBegin();
while (!it1.IsAtEnd())
{
color[0] = static_cast<float>(vnl_sample_uniform(0.0, 1.0));
color[1] = static_cast<float>(vnl_sample_uniform(0.0, 1.0));
color[2] = static_cast<float>(vnl_sample_uniform(0.0, 1.0));
it1.Set(color);
++it1;
}
// Reading the values to verify the image content
std::cout << "--- Initial image --- " << std::endl;
it1.GoToBegin();
while (!it1.IsAtEnd())
{
const myVectorImageType::PixelType c(it1.Get());
std::cout << c[0] << " ";
std::cout << c[1] << " ";
std::cout << c[2] << std::endl;
++it1;
}
bool passed = true;
// Get the first element
using AdaptFilterType = itk::AdaptImageFilter<myVectorImageType, myImageType, myAccessorType>;
auto adaptImage = AdaptFilterType::New();
myAccessorType accessor;
accessor.SetElementNumber(0);
adaptImage->SetAccessor(accessor);
adaptImage->SetInput(myImage);
adaptImage->UpdateLargestPossibleRegion();
myIteratorType it(adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion());
std::cout << "--- First component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get()[0]))
{
passed = false;
}
++it;
++it1;
}
// Get the second element
accessor.SetElementNumber(1);
adaptImage->SetAccessor(accessor);
adaptImage->UpdateLargestPossibleRegion();
it = myIteratorType(adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion());
std::cout << "--- Second component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get()[1]))
{
passed = false;
}
++it;
++it1;
}
// Convert to the third component
accessor.SetElementNumber(2);
adaptImage->SetAccessor(accessor);
adaptImage->UpdateLargestPossibleRegion();
it = myIteratorType(adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion());
std::cout << "--- Third component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get()[2]))
{
passed = false;
}
++it;
++it1;
}
// Test access to Accessor
std::cout << adaptImage->GetAccessor().GetElementNumber() << std::endl;
std::cout << std::endl;
if (passed)
{
std::cout << "AdaptImageFilterTest2 passed" << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "AdaptImageFilterTest2 passed" << std::endl;
return EXIT_FAILURE;
}
}
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