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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 "itkApproximateSignedDistanceMapImageFilter.h"
#include "itkShiftScaleImageFilter.h"
#include "itkTestingMacros.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 += itk::Math::sqr( p[j] - center[j] );
}
accum = std::sqrt( accum );
return ( accum - radius );
}
}
int itkApproximateSignedDistanceMapImageFilterTest(int argc, char* argv[] )
{
if(argc < 3)
{
std::cerr << "Usage: " << argv[0] << " InsideValue OutputImage\n";
return EXIT_FAILURE;
}
const unsigned int ImageDimension = 2;
typedef unsigned int InputPixelType;
typedef float PixelType;
typedef short OutputPixelType;
typedef itk::Image<InputPixelType,ImageDimension> InputImageType;
typedef itk::Image<PixelType,ImageDimension> ImageType;
typedef itk::Image<OutputPixelType,ImageDimension> OutputImageType;
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 = atoi( argv[1] );
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,ImageType> DistanceType;
DistanceType::Pointer distance = DistanceType::New();
distance->SetInput( image );
distance->SetInsideValue( InsideValue );
distance->SetOutsideValue( OutsideValue );
TEST_SET_GET_VALUE( InsideValue, distance->GetInsideValue() );
TEST_SET_GET_VALUE( OutsideValue, distance->GetOutsideValue() );
try
{
distance->Update();
typedef itk::ShiftScaleImageFilter< ImageType, OutputImageType > RescaleType;
RescaleType::Pointer rescale = RescaleType::New();
rescale->SetInput( distance->GetOutput() );
rescale->SetScale( 1000 );
rescale->Update();
if( rescale->GetUnderflowCount() + rescale->GetOverflowCount() > 0 )
{
std::cerr << "Under-/overflow when scaling distances before writing distance map to disc." << std::endl;
}
typedef itk::ImageFileWriter<OutputImageType> OutputWriterType;
OutputWriterType::Pointer owriter = OutputWriterType::New();
owriter->SetInput( rescale->GetOutput() );
owriter->SetFileName( argv[2] );
owriter->Update();
}
catch (itk::ExceptionObject &err)
{
(&err)->Print(std::cerr);
return EXIT_FAILURE;
}
PixelType maxDeviation = 0;
typedef itk::ImageRegionConstIteratorWithIndex<ImageType> OutputIterator;
OutputIterator oiter( distance->GetOutput(),
distance->GetOutput()->GetLargestPossibleRegion() );
oiter.GoToBegin();
while( !oiter.IsAtEnd() )
{
PointType point;
image->TransformIndexToPhysicalPoint( oiter.GetIndex(), point );
OutputPixelType deviation =
itk::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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