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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 "itkImageFileWriter.h"
#include "itkNumericTraits.h"
#include "itkTestingMacros.h"
// Anonymous namespace
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 << "Missing parameters" << std::endl;
std::cerr << "Usage: " << argv[0] << " insideValue outputImage" << std::endl;
return EXIT_FAILURE;
}
const unsigned int ImageDimension = 2;
typedef unsigned int InputPixelType;
typedef float OutputPixelType;
typedef short WriterPixelType;
typedef double PointPixelType;
typedef itk::Image< InputPixelType, ImageDimension > InputImageType;
typedef itk::Image< OutputPixelType, ImageDimension > OutputImageType;
typedef itk::Image< WriterPixelType, ImageDimension > WriterImageType;
typedef itk::Point< PointPixelType, 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 > InputIteratorType;
InputIteratorType 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 the filter
typedef itk::ApproximateSignedDistanceMapImageFilter< InputImageType, OutputImageType >
DistanceMapFilterType;
DistanceMapFilterType::Pointer signedDistanceMapFilter =
DistanceMapFilterType::New();
EXERCISE_BASIC_OBJECT_METHODS( signedDistanceMapFilter,
ApproximateSignedDistanceMapImageFilter, ImageToImageFilter );
signedDistanceMapFilter->SetInput( image );
signedDistanceMapFilter->SetInsideValue( insideValue );
TEST_SET_GET_VALUE( insideValue, signedDistanceMapFilter->GetInsideValue() );
signedDistanceMapFilter->SetOutsideValue( outsideValue );
TEST_SET_GET_VALUE( outsideValue, signedDistanceMapFilter->GetOutsideValue() );
TRY_EXPECT_NO_EXCEPTION( signedDistanceMapFilter->Update() );
// Write the output image
typedef itk::ShiftScaleImageFilter< OutputImageType, WriterImageType >
RescaleFilterType;
RescaleFilterType::Pointer rescaler = RescaleFilterType::New();
rescaler->SetInput( signedDistanceMapFilter->GetOutput() );
rescaler->SetScale( 1000 );
TRY_EXPECT_NO_EXCEPTION( rescaler->Update() );
if( rescaler->GetUnderflowCount() + rescaler->GetOverflowCount() > 0 )
{
std::cerr << "Test failed!" << std::endl;
std::cerr << "Under-/overflow when scaling distances before writing distance map to disc: " << std::endl
<< "Underflow: " << rescaler->GetUnderflowCount() << std::endl
<< "Overflow: " << rescaler->GetOverflowCount() << std::endl;
return EXIT_FAILURE;
}
typedef itk::ImageFileWriter< WriterImageType > WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetInput( rescaler->GetOutput() );
writer->SetFileName( argv[2] );
TRY_EXPECT_NO_EXCEPTION( writer->Update() );
OutputPixelType maxDistance = 0;
typedef itk::ImageRegionConstIteratorWithIndex< OutputImageType > OutputIteratorType;
OutputIteratorType oIt( signedDistanceMapFilter->GetOutput(),
signedDistanceMapFilter->GetOutput()->GetLargestPossibleRegion() );
oIt.GoToBegin();
while( !oIt.IsAtEnd() )
{
PointType point;
image->TransformIndexToPhysicalPoint( oIt.GetIndex(), point );
OutputPixelType distance =
itk::Math::abs( oIt.Get() - SimpleSignedDistance( point ) );
if( distance > maxDistance )
{
maxDistance = distance;
}
++oIt;
}
// Regression test
OutputPixelType maxAllowedDistance = 2;
if( maxDistance > maxAllowedDistance )
{
std::cout << "Test failed!" << std::endl;
std::cout << "The output image had pixels too far away from the correct distance." << std::endl;
std::cout << "The maximum error was: "
<< static_cast< itk::NumericTraits< OutputPixelType >::PrintType >( maxDistance ) << std::endl;
std::cout << "The maximum allowed error is: "
<< static_cast< itk::NumericTraits< OutputPixelType >::PrintType >( maxAllowedDistance ) << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test passed" << std::endl;
return EXIT_SUCCESS;
}
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