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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkApproximateSignedDistanceMapImageFilterTest.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 "itkApproximateSignedDistanceMapImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkRescaleIntensityImageFilter.h"
#include "vnl/vnl_math.h"
#include "itkImageFileWriter.h"
namespace{
// simple signed distance function
template <typename TPoint>
double
SimpleSignedDistance( const TPoint & p )
{
TPoint center;
center.Fill( 32 );
double radius = 16;
double accum = 0.0;
for( unsigned int j = 0; j < TPoint::PointDimension; j++ )
{
accum += vnl_math_sqr( p[j] - center[j] );
}
accum = vcl_sqrt( accum );
return ( accum - radius );
}
}
int itkApproximateSignedDistanceMapImageFilterTest(int argc, char* argv[] )
{
if(argc < 2)
{
std::cerr << "Usage: " << argv[0] << " OutputImage\n";
return EXIT_FAILURE;
}
const unsigned int ImageDimension = 2;
typedef unsigned int InputPixelType;
typedef float OutputPixelType;
typedef unsigned char WriterPixelType;
typedef itk::Image<InputPixelType,ImageDimension> InputImageType;
typedef itk::Image<OutputPixelType,ImageDimension> OutputImageType;
typedef itk::Image<WriterPixelType,ImageDimension> WriterImageType;
typedef InputImageType::IndexType IndexType;
typedef itk::Point<double,ImageDimension> PointType;
// Make a binary input image based on the signed distance function
// using the inside and outside values
const InputPixelType InsideValue = 100;
const InputPixelType OutsideValue = 0;
InputImageType::Pointer image = InputImageType::New();
InputImageType::SizeType size;
size.Fill( 64 );
InputImageType::RegionType region( size );
image->SetRegions( region );
image->Allocate();
typedef itk::ImageRegionIteratorWithIndex<InputImageType> InputIterator;
InputIterator iter( image, region );
iter.GoToBegin();
while( !iter.IsAtEnd() )
{
PointType point;
image->TransformIndexToPhysicalPoint( iter.GetIndex(), point );
iter.Set( SimpleSignedDistance( point ) > 0 ? OutsideValue : InsideValue );
++iter;
}
// Set up image filter
typedef itk::ApproximateSignedDistanceMapImageFilter<InputImageType,OutputImageType> DistanceType;
DistanceType::Pointer distance = DistanceType::New();
distance->SetInput( image );
distance->SetInsideValue(InsideValue);
distance->SetOutsideValue(OutsideValue);
try
{
distance->Update();
typedef itk::RescaleIntensityImageFilter<OutputImageType, WriterImageType> RescaleType;
RescaleType::Pointer rescale = RescaleType::New();
rescale->SetInput(distance->GetOutput());
rescale->SetOutputMinimum(0);
rescale->SetOutputMaximum(255);
typedef itk::ImageFileWriter<WriterImageType> OutputWriterType;
OutputWriterType::Pointer owriter = OutputWriterType::New();
owriter->SetInput( rescale->GetOutput() );
owriter->SetFileName( argv[1] );
owriter->Update();
}
catch (itk::ExceptionObject &err)
{
(&err)->Print(std::cerr);
return EXIT_FAILURE;
}
OutputPixelType maxDeviation = 0;
typedef itk::ImageRegionConstIteratorWithIndex<OutputImageType> OutputIterator;
OutputIterator oiter( distance->GetOutput(),
distance->GetOutput()->GetLargestPossibleRegion() );
oiter.GoToBegin();
while( !oiter.IsAtEnd() )
{
PointType point;
image->TransformIndexToPhysicalPoint( oiter.GetIndex(), point );
OutputPixelType deviation =
vnl_math_abs(oiter.Get() - SimpleSignedDistance(point) );
if (deviation > maxDeviation )
{
maxDeviation = deviation;
}
++oiter;
}
std::cout << "dev " << maxDeviation << std::endl;
// Exercise other member functions
distance->Print( std::cout );
std::cout << "The maximum error was " << maxDeviation << std::endl;
if ( maxDeviation > 2 )
{
std::cout << "The output image had pixels too far away from the correct distance. ";
std::cout << "Test failed" << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test passed" << std::endl;
return EXIT_SUCCESS;
}
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