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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkAtan2ImageFilterTest.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 "itkAtan2ImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
int itkAtan2ImageFilterTest(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 sinImage = InputImageType::New();
InputImageType::Pointer cosImage = 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 Sinus Image
sinImage->SetRegions( region );
sinImage->Allocate();
// Initialize Cosinus Image
cosImage->SetRegions( region );
cosImage->Allocate();
// Create one iterator for the Input Image (this is a light object)
InputIteratorType it1( sinImage, sinImage->GetBufferedRegion() );
// Initialize the content of Image A
const double sinValue = vcl_sin( vnl_math::pi / 6.0 );
std::cout << "Content of the Input " << std::endl;
it1.GoToBegin();
while( !it1.IsAtEnd() )
{
it1.Set( sinValue );
std::cout << it1.Get() << std::endl;
++it1;
}
// Create one iterator for the Input Image (this is a light object)
InputIteratorType it2( cosImage, cosImage->GetBufferedRegion() );
// Initialize the content of Image A
const double cosValue = vcl_cos( vnl_math::pi / 6.0 );
std::cout << "Content of the Input " << std::endl;
it2.GoToBegin();
while( !it2.IsAtEnd() )
{
it2.Set( cosValue );
std::cout << it2.Get() << std::endl;
++it2;
}
// Declare the type for the Atan filter
typedef itk::Atan2ImageFilter<
InputImageType, InputImageType, OutputImageType > FilterType;
// Create the Filter
FilterType::Pointer filter = FilterType::New();
// Connect the input images
filter->SetInput1( sinImage );
filter->SetInput2( cosImage );
// Get the Smart Pointer to the Filter Output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Execute the filter
filter->Update();
// 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();
it1.GoToBegin();
it2.GoToBegin();
while( !ot.IsAtEnd() )
{
const InputImageType::PixelType input1 = it1.Get();
const InputImageType::PixelType input2 = it2.Get();
const OutputImageType::PixelType output = ot.Get();
const OutputImageType::PixelType atan2 = vcl_atan2( input1, input2 );
if( vcl_fabs( atan2 - output ) > epsilon )
{
std::cerr << "Error in itkAtanImageFilterTest " << std::endl;
std::cerr << " vcl_atan2( " << input1 << ", " << input2 << ") = " << atan2 << std::endl;
std::cerr << " differs from " << output;
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++ot;
++it1;
}
return EXIT_SUCCESS;
}
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