itkimageadaptornthelementtest.cxx

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageAdaptorNthElementTest.cxx,v $
  Language:  C++
  Date:      $Date: 2007-08-10 14:34:01 $
  Version:   $Revision: 1.14 $

  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
//-------------------------------------------
//
//  Example of the use of Adaptors
//  to get access to the N-th component
//  of an image with pixels of container type
//
//-------------------------------------------


#include <itkImage.h>
#include <itkIndex.h>
#include <itkImageAdaptor.h>
#include <itkImageRegionIteratorWithIndex.h>
#include <itkNthElementImageAdaptor.h>
#include <itkAddImageFilter.h>
#include <itkVector.h>


int itkImageAdaptorNthElementTest(int, char* [] )
{

  //-------------------------------------------------------------
  //                        Typedefs
  //-------------------------------------------------------------

  // Float Image typedefs
  typedef   float                                       myFloatPixelType;
  typedef   itk::Image<myFloatPixelType, 3>     myFloatImageType;

  typedef   myFloatImageType::SizeType                  mySizeType;
  typedef   myFloatImageType::IndexType                 myIndexType;
  typedef   myFloatImageType::RegionType                myRegionType;


  // RGBPixel Image typedefs
  typedef   itk::Vector<myFloatPixelType,3>             myContainerPixelType;
  typedef   itk::Image<
                       myContainerPixelType, 3>    myContainerPixelImageType;



  typedef   itk::NthElementImageAdaptor< myContainerPixelImageType,
                                         myFloatPixelType >        myAdaptorType;

  typedef itk::ImageRegionIteratorWithIndex< 
                                   myFloatImageType > myFloatIteratorType;


  typedef itk::ImageRegionIteratorWithIndex< 
                         myContainerPixelImageType >   myContainerPixelIteratorType;


  typedef itk::AddImageFilter< myAdaptorType, 
                               myFloatImageType, 
                               myFloatImageType >       myFilterType;


  //-------------------------------------------------------------
  //                 Create and Allocate the image
  //-------------------------------------------------------------

  // Define their size, and start index
  mySizeType size;
  size[0] = 2;
  size[1] = 2;
  size[2] = 2;    // Small size, because we are printing it
  
  myIndexType start;
  start.Fill(0);


  myRegionType region;
  region.SetIndex( start );
  region.SetSize( size );

  float spacing[3];
  spacing[0] = 1.0;
  spacing[1] = 1.0;
  spacing[2] = 1.0;
  
  //-------------------------------------------------------------
  //                 Create and Initialize the RGBPixel image
  //-------------------------------------------------------------

  myContainerPixelImageType::Pointer   myContainerPixelImage 
                                          = myContainerPixelImageType::New();

  myContainerPixelImage->SetLargestPossibleRegion( region );
  myContainerPixelImage->SetBufferedRegion( region );
  myContainerPixelImage->SetRequestedRegion( region );
  myContainerPixelImage->Allocate();
  myContainerPixelImage->SetSpacing( spacing );

  myContainerPixelIteratorType it(  myContainerPixelImage, 
                            myContainerPixelImage->GetRequestedRegion() );

  myContainerPixelType initialPixelValue;
  initialPixelValue[ 0 ] =  5;
  initialPixelValue[ 1 ] = 11;
  initialPixelValue[ 2 ] = 17;

  while( !it.IsAtEnd() ) 
  {
    it.Set( initialPixelValue );  
    ++it;
  }

  std::cout << "Initial Container Image Values : " << std::endl;
  it.GoToBegin();
  while( !it.IsAtEnd() ) 
  {
    myIndexType index = it.GetIndex();
    std::cout <<  "[";
    std::cout.width(3);
    std::cout << index[0] << ",";
    std::cout.width(3);
    std::cout << index[1] << ",";
    std::cout.width(3);
    std::cout << index[2] << "] =  ";
    std::cout.width(4);
    std::cout <<  it.Get()[0] << ",";
    std::cout.width(4);
    std::cout <<  it.Get()[1] << ",";
    std::cout.width(4);
    std::cout <<  it.Get()[2] << std::endl;  
    ++it;
  }


  std::cout << "Container Image Initializaed" << std::endl;
 
  //-------------------------------------------------------------
  //                 Create and Initialize the Float image
  //-------------------------------------------------------------

  myFloatImageType::Pointer   myFloatImage = myFloatImageType::New();

  myFloatImage->SetLargestPossibleRegion( region );
  myFloatImage->SetBufferedRegion( region );
  myFloatImage->SetRequestedRegion( region );
  myFloatImage->Allocate();
  myFloatImage->SetSpacing( spacing );

  myFloatIteratorType itf(  myFloatImage, myFloatImage->GetRequestedRegion() );

  myFloatPixelType initialFloatValue = 5.0;

  while( !itf.IsAtEnd() ) 
  {
    itf.Set( initialFloatValue );  
    ++itf;
  }

  std::cout << "Initial Float Image Values : " << std::endl;
  itf.GoToBegin();
  while( !itf.IsAtEnd() ) 
  {
    myIndexType index = itf.GetIndex();
    std::cout <<  "[";
    std::cout.width(3);
    std::cout << index[0] << ",";
    std::cout.width(3);
    std::cout << index[1] << ",";
    std::cout.width(3);
    std::cout << index[2] << "] =  ";
    std::cout.width(8);
    std::cout <<  itf.Get() << std::endl;  
    ++itf;
  }

  std::cout << "Float Image Initializaed" << std::endl;


  //-------------------------------------------------------------
  //         Create the adaptor and connect the image
  //-------------------------------------------------------------

  myAdaptorType::Pointer myAdaptor = myAdaptorType::New();

  myAdaptor->SetImage( myContainerPixelImage );




  //-------------------------------------------------------------
  //         Create the filter and connect the inputs
  //-------------------------------------------------------------

  myFilterType::Pointer    filter   = myFilterType::New();

  filter->SetInput1( myAdaptor );
  filter->SetInput2( myFloatImage );



  //-------------------------------------------------------------
  //      Set the requested region of  the Output image
  //-------------------------------------------------------------

  myFloatImageType::Pointer myFloatOutputImage = filter->GetOutput();
  myFloatOutputImage->SetSpacing( spacing );

  std::cout << "Float Output Image Initializaed" << std::endl;



  //-------------------------------------------------------------
  //         Force the execution of the filter
  //-------------------------------------------------------------

  std::cout << "Calling filter Update" << std::endl;


 // Multiplex !!  
  myAdaptor->SelectNthElement( 0 );

  filter->Update();
  
  std::cout << "Filter Updated" << std::endl;

  //-------------------------------------------------------------
  //         Force the execution of the filter
  //-------------------------------------------------------------
  
  myFloatOutputImage = filter->GetOutput();
  
  myFloatIteratorType ito(  myFloatOutputImage, myFloatOutputImage->GetRequestedRegion() );


  std::cout << std::endl;
  std::cout << "Filter Output :" << std::endl;
  while( !ito.IsAtEnd() ) 
  {
    myIndexType index = ito.GetIndex();
    std::cout <<  "[";
    std::cout.width(3);
    std::cout << index[0] << ",";
    std::cout.width(3);
    std::cout << index[1] << ",";
    std::cout.width(3);
    std::cout << index[2] << "] =  ";
    std::cout.width(8);
    std::cout <<  ito.Get() << std::endl;  
    ++ito;
  }



  //-------------------------------------------------------------
  //         Force the execution of the filter
  //-------------------------------------------------------------
  // Second Multiplex !!  

  myAdaptor->SelectNthElement( 1 );

  filter->Update();  
  
  std::cout << std::endl;
  std::cout << "Second Filter Output :" << std::endl;
  ito = myFloatIteratorType(  myFloatOutputImage, myFloatOutputImage->GetRequestedRegion() );
  while( !ito.IsAtEnd() ) 
  {
    myIndexType index = ito.GetIndex();
    std::cout <<  "[";
    std::cout.width(3);
    std::cout << index[0] << ",";
    std::cout.width(3);
    std::cout << index[1] << ",";
    std::cout.width(3);
    std::cout << index[2] << "] =  ";
    std::cout.width(8);
    std::cout <<  ito.Get() << std::endl;  
    ++ito;
  }



  //-------------------------------------------------------------
  //         Force the execution of the filter
  //-------------------------------------------------------------
  // Third Multiplex !!  

  myAdaptor->SelectNthElement( 2 );

  filter->Update();  

  std::cout << std::endl;
  std::cout << "Second Filter Output :" << std::endl;
  ito = myFloatIteratorType(  myFloatOutputImage, myFloatOutputImage->GetRequestedRegion() );
  while( !ito.IsAtEnd() ) 
  {
    myIndexType index = ito.GetIndex();
    std::cout <<  "[";
    std::cout.width(3);
    std::cout << index[0] << ",";
    std::cout.width(3);
    std::cout << index[1] << ",";
    std::cout.width(3);
    std::cout << index[2] << "] =  ";
    std::cout.width(8);
    std::cout <<  ito.Get() << std::endl;  
    ++ito;
  }



  return EXIT_SUCCESS;

}