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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkAbsImageFilterAndAdaptorTest.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include <itkImage.h>
#include <itkAbsImageFilter.h>
#include <itkAbsImageAdaptor.h>
#include <itkImageRegionIteratorWithIndex.h>
#include <itkSubtractImageFilter.h>
int itkAbsImageFilterAndAdaptorTest(int, char* [] )
{
// Define the dimension of the images
const unsigned int ImageDimension = 3;
// Declare the types of the images
typedef itk::Image<float, ImageDimension> InputImageType;
typedef itk::Image<float, 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 pi = vcl_atan( 1.0 ) * 4.0;
const double value = pi / 6.0;
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 Abs filter
typedef itk::AbsImageFilter< InputImageType,
OutputImageType > FilterType;
// Create an Abs Filter
FilterType::Pointer filter = FilterType::New();
// Connect the input images
filter->SetInput( inputImage );
// Get the Smart Pointer to the Filter Output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Execute the filter
filter->Update();
filter->SetFunctor(filter->GetFunctor());
// Create an iterator for going through the image output
OutputIteratorType ot(outputImage, outputImage->GetRequestedRegion());
// Check the content of the result image
std::cout << "Verification of the output " << std::endl;
const OutputImageType::PixelType epsilon = 1e-6;
ot.GoToBegin();
it.GoToBegin();
while( !ot.IsAtEnd() )
{
std::cout << ot.Get() << " = ";
std::cout << vcl_fabs( it.Get() ) << std::endl;
const InputImageType::PixelType input = it.Get();
const OutputImageType::PixelType output = ot.Get();
const OutputImageType::PixelType absolute = vcl_fabs(input);
if( vcl_fabs( absolute - output ) > epsilon )
{
std::cerr << "Error in itkAbsImageFilterTest " << std::endl;
std::cerr << " abs( " << input << ") = " << absolute << std::endl;
std::cerr << " differs from " << output;
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++ot;
++it;
}
//---------------------------------------
// This section tests for AbsImageAdaptor
//---------------------------------------
typedef itk::AbsImageAdaptor<InputImageType,
OutputImageType::PixelType> AdaptorType;
AdaptorType::Pointer absAdaptor = AdaptorType::New();
absAdaptor->SetImage( inputImage );
typedef itk::SubtractImageFilter<
OutputImageType,
AdaptorType,
OutputImageType > DiffFilterType;
DiffFilterType::Pointer diffFilter = DiffFilterType::New();
diffFilter->SetInput1( outputImage );
diffFilter->SetInput2( absAdaptor );
diffFilter->Update();
// Get the Smart Pointer to the Diff filter Output
OutputImageType::Pointer diffImage = diffFilter->GetOutput();
// Check the content of the diff image
std::cout << "Comparing the results with those of an Adaptor" << std::endl;
std::cout << "Verification of the output " << std::endl;
// Create an iterator for going through the image output
OutputIteratorType dt(diffImage, diffImage->GetRequestedRegion());
dt.GoToBegin();
while( !dt.IsAtEnd() )
{
std::cout << dt.Get() << std::endl;
const OutputImageType::PixelType diff = dt.Get();
if( vcl_fabs( diff ) > epsilon )
{
std::cerr << "Error in itkAbsImageFilterTest " << std::endl;
std::cerr << "Comparing results with Adaptors" << std::endl;
std::cerr << " difference = " << diff << std::endl;
std::cerr << " differs from 0 ";
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++dt;
}
return EXIT_SUCCESS;
}
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