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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkAdaptImageFilterTest2.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
/**
*
* This program illustrates the AdaptImageFilter
*
* The example shows how an Accessor can be used to
* convert an Vector image to an image that has
* just a single component.
*
* That will allow to pass a component of the
* image as input any filter that expects
* a float image
*
*/
#include <itkAdaptImageFilter.h>
#include <itkImageRegionIteratorWithIndex.h>
#include <itkVector.h>
#include <itkNthElementPixelAccessor.h>
#include <vnl/vnl_sample.h>
//-------------------------------------
// Typedefs for convenience
//-------------------------------------
typedef itk::Image< itk::Vector<float, 3>, 2 > myVectorImageType;
typedef itk::ImageRegionIteratorWithIndex< myVectorImageType > myVectorIteratorType;
typedef itk::NthElementPixelAccessor<float, itk::Vector<float, 3> > myAccessorType;
typedef itk::Image< float, 2 > myImageType;
typedef itk::ImageRegionIteratorWithIndex< myImageType > myIteratorType;
//-------------------------
//
// Main code
//
//-------------------------
int itkAdaptImageFilterTest2(int, char* [] ) {
myVectorImageType::SizeType size;
size[0] = 2;
size[1] = 2;
myVectorImageType::IndexType index;
index[0] = 0;
index[1] = 0;
myVectorImageType::RegionType region;
region.SetIndex( index );
region.SetSize( size );
myVectorImageType::Pointer myImage = myVectorImageType::New();
myImage->SetLargestPossibleRegion( region );
myImage->SetBufferedRegion( region );
myImage->SetRequestedRegion( region );
myImage->Allocate();
myVectorIteratorType it1( myImage, myImage->GetRequestedRegion() );
// Value to initialize the pixels
myVectorImageType::PixelType color;
// Initializing all the pixel in the image
it1.GoToBegin();
while( !it1.IsAtEnd() )
{
color[0] = (float) vnl_sample_uniform(0.0, 1.0);
color[1] = (float) vnl_sample_uniform(0.0, 1.0);
color[2] = (float) vnl_sample_uniform(0.0, 1.0);
it1.Set(color);
++it1;
}
// Reading the values to verify the image content
std::cout << "--- Initial image --- " << std::endl;
it1.GoToBegin();
while( !it1.IsAtEnd() )
{
const myVectorImageType::PixelType c( it1.Get() );
std::cout << c[0] << " ";
std::cout << c[1] << " ";
std::cout << c[2] << std::endl;
++it1;
}
bool passed = true;
// Get the first element
typedef itk::AdaptImageFilter<myVectorImageType, myImageType, myAccessorType> AdaptFilterType;
AdaptFilterType::Pointer adaptImage = AdaptFilterType::New();
myAccessorType accessor;
accessor.SetElementNumber(0);
adaptImage->SetAccessor( accessor );
adaptImage->SetInput(myImage);
adaptImage->UpdateLargestPossibleRegion();
myIteratorType it( adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion() );
std::cout << "--- First component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while( !it.IsAtEnd() )
{
std::cout << it.Get() << std::endl;
if (it.Get() != it1.Get()[0])
{
passed = false;
}
++it;
++it1;
}
// Get the second element
accessor.SetElementNumber(1);
adaptImage->SetAccessor( accessor );
adaptImage->UpdateLargestPossibleRegion();
it = myIteratorType( adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion() );
std::cout << "--- Second component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while( !it.IsAtEnd() )
{
std::cout << it.Get() << std::endl;
if (it.Get() != it1.Get()[1])
{
passed = false;
}
++it;
++it1;
}
// Convert to the third component
accessor.SetElementNumber(2);
adaptImage->SetAccessor( accessor );
adaptImage->UpdateLargestPossibleRegion();
it = myIteratorType( adaptImage->GetOutput(), adaptImage->GetOutput()->GetRequestedRegion() );
std::cout << "--- Third component values --- " << std::endl;
it.GoToBegin();
it1.GoToBegin();
while( !it.IsAtEnd() )
{
std::cout << it.Get() << std::endl;
if (it.Get() != it1.Get()[2])
{
passed = false;
}
++it;
++it1;
}
// Test access to Accessor
std::cout << adaptImage->GetAccessor().GetElementNumber() << std::endl;
std::cout << std::endl;
if (passed)
{
std::cout << "AdaptImageFilterTest2 passed" << std::endl;
return EXIT_SUCCESS;
}
else
{
std::cout << "AdaptImageFilterTest2 passed" << std::endl;
return EXIT_FAILURE;
}
}
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