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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 RGBPixel image to an image that has
* just the red component.
*
* That will allow to pass the red component of this
* image as input any filter that expects
* a float image
*
*/
#include "itkAdaptImageFilter.h"
#include "itkRedPixelAccessor.h"
#include "itkGreenPixelAccessor.h"
#include "itkBluePixelAccessor.h"
#include "itkSimpleFilterWatcher.h"
#include "vnl/vnl_sample.h"
#include "itkMath.h"
//-------------------------------------
// Typedefs for convenience
//-------------------------------------
using myRGBImageType = itk::Image<itk::RGBPixel<float>, 2>;
using myRGBIteratorType = itk::ImageRegionIteratorWithIndex<myRGBImageType>;
using myRedAccessorType = itk::RedPixelAccessor<float>;
using myGreenAccessorType = itk::GreenPixelAccessor<float>;
using myBlueAccessorType = itk::BluePixelAccessor<float>;
using myImageType = itk::Image<float, 2>;
using myIteratorType = itk::ImageRegionIteratorWithIndex<myImageType>;
//-------------------------
//
// Main code
//
//-------------------------
int
itkAdaptImageFilterTest(int, char *[])
{
myRGBImageType::SizeType size;
size[0] = 2;
size[1] = 2;
myRGBImageType::IndexType index;
index[0] = 0;
index[1] = 0;
myRGBImageType::RegionType region{ index, size };
auto myImage = myRGBImageType::New();
myImage->SetRegions(region);
myImage->Allocate();
myRGBIteratorType it1(myImage, myImage->GetRequestedRegion());
// Value to initialize the pixels
myRGBImageType::PixelType color;
// Initializing all the pixel in the image
it1.GoToBegin();
while (!it1.IsAtEnd())
{
color.Set(static_cast<float>(vnl_sample_uniform(0.0, 1.0)),
static_cast<float>(vnl_sample_uniform(0.0, 1.0)),
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 myRGBImageType::PixelType c(it1.Get());
std::cout << c.GetRed() << " ";
std::cout << c.GetGreen() << " ";
std::cout << c.GetBlue() << std::endl;
++it1;
}
bool passed = true;
// Convert to a red image
itk::AdaptImageFilter<myRGBImageType, myImageType, myRedAccessorType>::Pointer adaptImageToRed =
itk::AdaptImageFilter<myRGBImageType, myImageType, myRedAccessorType>::New();
itk::SimpleFilterWatcher redWatcher(adaptImageToRed, "Red");
adaptImageToRed->SetInput(myImage);
adaptImageToRed->UpdateLargestPossibleRegion();
myIteratorType it(adaptImageToRed->GetOutput(), adaptImageToRed->GetOutput()->GetRequestedRegion());
std::cout << "--- Red values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get().GetRed()))
{
passed = false;
}
++it;
++it1;
}
// Convert to a green image
itk::AdaptImageFilter<myRGBImageType, myImageType, myGreenAccessorType>::Pointer adaptImageToGreen =
itk::AdaptImageFilter<myRGBImageType, myImageType, myGreenAccessorType>::New();
itk::SimpleFilterWatcher greenWatcher(adaptImageToGreen, "Green");
adaptImageToGreen->SetInput(myImage);
adaptImageToGreen->UpdateLargestPossibleRegion();
it = myIteratorType(adaptImageToGreen->GetOutput(), adaptImageToGreen->GetOutput()->GetRequestedRegion());
std::cout << "--- Green values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get().GetGreen()))
{
passed = false;
}
++it;
++it1;
}
// Convert to a blue image
itk::AdaptImageFilter<myRGBImageType, myImageType, myBlueAccessorType>::Pointer adaptImageToBlue =
itk::AdaptImageFilter<myRGBImageType, myImageType, myBlueAccessorType>::New();
itk::SimpleFilterWatcher blueWatcher(adaptImageToBlue, "Blue");
adaptImageToBlue->SetInput(myImage);
adaptImageToBlue->UpdateLargestPossibleRegion();
it = myIteratorType(adaptImageToBlue->GetOutput(), adaptImageToBlue->GetOutput()->GetRequestedRegion());
std::cout << "--- Blue values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
if (itk::Math::NotExactlyEquals(it.Get(), it1.Get().GetBlue()))
{
passed = false;
}
++it;
++it1;
}
std::cout << std::endl;
if (passed)
{
std::cout << "AdaptImageFilterTest passed." << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cerr << "AdaptImageFilterTest failed." << std::endl;
return EXIT_FAILURE;
}
}
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