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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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 "itkSquareImageFilter.h"
#include "itkMath.h"
#include "itkTestingMacros.h"
int itkSquareImageFilterTest( int, char* [] )
{
// Define the dimension of the images
const unsigned int ImageDimension = 3;
// Declare the types of the images
typedef float InputPixelType;
typedef float OutputPixelType;
typedef itk::Image<InputPixelType, ImageDimension> InputImageType;
typedef itk::Image<OutputPixelType, ImageDimension> OutputImageType;
// Declare Iterator types apropriated for each image
typedef itk::ImageRegionIteratorWithIndex<
InputImageType> InputIteratorType;
typedef itk::ImageRegionIteratorWithIndex<
OutputImageType> OutputIteratorType;
// Declare the type of the index to access images
typedef itk::Index<ImageDimension> IndexType;
// Declare the type of the size
typedef itk::Size<ImageDimension> SizeType;
// Declare the type of the Region
typedef itk::ImageRegion<ImageDimension> RegionType;
// Create two images
InputImageType::Pointer inputImage = InputImageType::New();
// Define their size, and start index
SizeType size;
size[0] = 2;
size[1] = 2;
size[2] = 2;
IndexType start;
start[0] = 0;
start[1] = 0;
start[2] = 0;
RegionType region;
region.SetIndex( start );
region.SetSize( size );
// Initialize Image A
inputImage->SetLargestPossibleRegion( region );
inputImage->SetBufferedRegion( region );
inputImage->SetRequestedRegion( region );
inputImage->Allocate();
// Create one iterator for the Input Image (this is a light object)
InputIteratorType it( inputImage, inputImage->GetBufferedRegion() );
// Initialize the content of Image A
const double value = 30;
std::cout << "Content of the Input " << std::endl;
it.GoToBegin();
while( !it.IsAtEnd() )
{
it.Set( value );
std::cout << it.Get() << std::endl;
++it;
}
// Declare the type for the Square filter
typedef itk::SquareImageFilter< InputImageType, OutputImageType > FilterType;
// Create a Filter
FilterType::Pointer filter = FilterType::New();
EXERCISE_BASIC_OBJECT_METHODS( filter, SquareImageFilter, UnaryFunctorImageFilter );
// Connect the input images
filter->SetInput( inputImage );
filter->SetFunctor( filter->GetFunctor() );
// Execute the filter
filter->Update();
// Get the Smart Pointer to the filter output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Create an iterator for going through the image output
OutputIteratorType ot(outputImage, outputImage->GetRequestedRegion());
// Check the content of the result image
const OutputImageType::PixelType epsilon = 1e-6;
ot.GoToBegin();
it.GoToBegin();
while( !ot.IsAtEnd() )
{
const InputImageType::PixelType input = it.Get();
const OutputImageType::PixelType output = ot.Get();
const double x1 = input;
const double x2 = x1 * x1;
const OutputImageType::PixelType square =
static_cast<OutputImageType::PixelType>( x2 );
if( !itk::Math::FloatAlmostEqual( square, output, 10, epsilon ) )
{
std::cerr.precision( unsigned( itk::Math::abs( std::log10( epsilon ) ) ) );
std::cerr << "Error in itkSquareImageFilterTest " << std::endl;
std::cerr << " square( " << input << ") = " << square << std::endl;
std::cerr << " differs from " << output;
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++ot;
++it;
}
return EXIT_SUCCESS;
}
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