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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkSubsampleTest.cxx,v $
Language: C++
Date: $Date: 2005-08-21 12:40:55 $
Version: $Revision: 1.9 $
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 "itkImageToListAdaptor.h"
#include "itkSubsample.h"
#include "itkRandomImageSource.h"
#include "itkImageRegionIterator.h"
#include "itkScalarToArrayCastImageFilter.h"
#include "itkFixedArray.h"
int itkSubsampleTest(int, char* [] )
{
std::cout << "Subsample Test \n \n";
bool pass = true;
std::string whereFail = "" ;
typedef itk::Image< float, 3 > FloatImage ;
// Now generate a random image
typedef itk::RandomImageSource<FloatImage> SourceType;
SourceType::Pointer source = SourceType::New();
unsigned long size[3] = {17, 8, 20} ;
unsigned long totalSize = size[0] * size[1] * size[2] ;
source->SetSize(size);
float minValue = -100.0;
float maxValue = 1000.0;
source->SetMin( static_cast< FloatImage::PixelType >( minValue ) );
source->SetMax( static_cast< FloatImage::PixelType >( maxValue ) );
source->Update() ;
// creat a new image with array pixel type from the source
typedef itk::FixedArray< FloatImage::PixelType, 1 > ArrayPixelType ;
typedef itk::Image< ArrayPixelType, 3 > ArrayPixelImageType ;
typedef itk::ScalarToArrayCastImageFilter< FloatImage, ArrayPixelImageType >
ImageCastFilterType ;
ImageCastFilterType::Pointer castFilter = ImageCastFilterType::New() ;
castFilter->SetInput(source->GetOutput()) ;
castFilter->Update() ;
typedef itk::Statistics::ImageToListAdaptor< ArrayPixelImageType >
ImageToListAdaptorType ;
ImageToListAdaptorType::Pointer sample = ImageToListAdaptorType::New() ;
sample->SetImage(castFilter->GetOutput()) ;
typedef itk::Statistics::Subsample< ImageToListAdaptorType >
SubsampleType ;
SubsampleType::Pointer subsample =
SubsampleType::New() ;
subsample->SetSample(sample) ;
// tests begin
// add only the first half of instances of the sample
for (ImageToListAdaptorType::InstanceIdentifier id = 0 ;
id < static_cast< ImageToListAdaptorType::InstanceIdentifier >
(sample->Size() / 2) ;
id++)
{
subsample->AddInstance(id) ;
}
if ((totalSize / 2) != subsample->Size())
{
pass = false ;
whereFail = "Size()" ;
}
ArrayPixelImageType::IndexType index ;
index.Fill(2) ;// index {2, 2, 2} = instance identifier (offset from image)
ArrayPixelImageType::PixelType pixel = sample->GetImage()->GetPixel(index) ;
ImageToListAdaptorType::InstanceIdentifier ind =
static_cast< FloatImage::OffsetValueType >(sample->GetImage()
->ComputeOffset(index)) ;
if (pixel[0] != subsample->GetMeasurementVector(ind)[0])
{
pass = false ;
whereFail = "GetMeasurementVector()" ;
}
// iterator test
typedef itk::ImageRegionConstIterator< ArrayPixelImageType > ImageIterator ;
ImageIterator i_iter(sample->GetImage(),
sample->GetImage()->GetLargestPossibleRegion()) ;
SubsampleType::Iterator s_iter = subsample->Begin() ;
unsigned int count = 0 ;
while (count < subsample->Size())
{
if (i_iter.Get()[0] != s_iter.GetMeasurementVector()[0])
{
pass = false ;
whereFail = "Iterator: GetMeasurementVector()" ;
}
++count ;
++i_iter ;
++s_iter ;
}
if (s_iter != subsample->End())
{
pass = false ;
whereFail = "Iterator: End()" ;
}
if( !pass )
{
std::cout << "Test failed in " << whereFail << "." << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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