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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 "itkAbsoluteValueDifferenceImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkTestingMacros.h"
int
itkAbsoluteValueDifferenceImageFilterTest(int, char *[])
{
// Define the dimension of the images
constexpr unsigned int myDimension = 3;
// Define the values of the input images
constexpr float input1Value = 3.0;
constexpr float input2Value = 4.0;
// Define the values of the output images
constexpr float outputValue = 1.0;
// Define the precision for output comparison
const float epsilon = 1e-6;
// Declare the types of the images
using myImageType1 = itk::Image<float, myDimension>;
using myImageType2 = itk::Image<float, myDimension>;
using myImageType4 = itk::Image<float, myDimension>;
// Declare the type of the index to access images
using myIndexType = itk::Index<myDimension>;
// Declare the type of the size
using mySizeType = itk::Size<myDimension>;
// Declare the type of the Region
using myRegionType = itk::ImageRegion<myDimension>;
// Create two images
auto inputImageA = myImageType1::New();
auto inputImageB = myImageType2::New();
// Define their size, and start index
mySizeType size;
size[0] = 2;
size[1] = 2;
size[2] = 2;
myIndexType start;
start[0] = 0;
start[1] = 0;
start[2] = 0;
myRegionType region{ start, size };
// Initialize Image A
inputImageA->SetRegions(region);
inputImageA->Allocate();
// Initialize Image B
inputImageB->SetRegions(region);
inputImageB->Allocate();
// Declare Iterator types apropriated for each image
using myIteratorType1 = itk::ImageRegionIteratorWithIndex<myImageType1>;
using myIteratorType2 = itk::ImageRegionIteratorWithIndex<myImageType2>;
using myIteratorType4 = itk::ImageRegionIteratorWithIndex<myImageType4>;
// Create one iterator for Image A (this is a light object)
myIteratorType1 it1(inputImageA, inputImageA->GetBufferedRegion());
// Initialize the content of Image A
std::cout << "First operand " << std::endl;
while (!it1.IsAtEnd())
{
it1.Set(input1Value);
std::cout << it1.Get() << std::endl;
++it1;
}
// Create one iterator for Image B (this is a light object)
myIteratorType2 it2(inputImageB, inputImageB->GetBufferedRegion());
// Initialize the content of Image B
std::cout << "Second operand " << std::endl;
while (!it2.IsAtEnd())
{
it2.Set(input2Value);
std::cout << it2.Get() << std::endl;
++it2;
}
// Declare the type for the filter
using myFilterType = itk::AbsoluteValueDifferenceImageFilter<myImageType1, myImageType2, myImageType4>;
// Create the filter
auto filter = myFilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, AbsoluteValueDifferenceImageFilter, BinaryGeneratorImageFilter);
// Connect the input images
filter->SetInput1(inputImageA);
filter->SetInput2(inputImageB);
// Get the Smart Pointer to the Filter Output
myImageType4::Pointer outputImage = filter->GetOutput();
// Execute the filter
filter->Update();
// Create an iterator for going through the image output
myIteratorType4 it4(outputImage, outputImage->GetBufferedRegion());
// Print the content of the result image
std::cout << " Result " << std::endl;
while (!it4.IsAtEnd())
{
std::cout << it4.Get() << std::endl;
if (itk::Math::abs(it4.Get() - outputValue) > epsilon)
{
std::cerr << "Error in the output" << std::endl;
std::cerr << "Value should be " << outputValue << std::endl;
std::cerr << "but is " << it4.Get() << std::endl;
return EXIT_FAILURE;
}
++it4;
}
// All objects should be automatically destroyed at this point
return EXIT_SUCCESS;
}
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