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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 "itkAtan2ImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkMath.h"
#include "itkTestingMacros.h"
int itkAtan2ImageFilterTest( int, char* [] )
{
// Define the dimension of the images
const unsigned int ImageDimension = 3;
// Declare the pixel types of the images
typedef float PixelType;
// Declare the types of the images
typedef itk::Image< PixelType, ImageDimension > InputImageType;
typedef itk::Image< PixelType, ImageDimension > OutputImageType;
// Declare appropriate Iterator types 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 = std::sin( itk::Math::pi / 6.0 );
it1.GoToBegin();
while( !it1.IsAtEnd() )
{
it1.Set( sinValue );
++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 = std::cos( itk::Math::pi / 6.0 );
it2.GoToBegin();
while( !it2.IsAtEnd() )
{
it2.Set( cosValue );
++it2;
}
// Declare the type for the Atan filter
typedef itk::Atan2ImageFilter<
InputImageType, InputImageType, OutputImageType > FilterType;
// Create the Filter
FilterType::Pointer filter = FilterType::New();
EXERCISE_BASIC_OBJECT_METHODS( filter, Atan2ImageFilter,
BinaryFunctorImageFilter );
// Set the input images
filter->SetInput1( sinImage );
filter->SetInput2( cosImage );
// Get 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
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 = std::atan2( input1, input2 );
if( !itk::Math::FloatAlmostEqual( atan2, output, 10, epsilon ) )
{
std::cerr.precision( static_cast< int >( itk::Math::abs( std::log10( epsilon ) ) ) );
std::cerr << "Error " << std::endl;
std::cerr << " std::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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