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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 "itkConnectedComponentImageFilter.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkSimpleFilterWatcher.h"
int itkConnectedComponentImageFilterBackgroundTest( int argc, char* argv[] )
{
if ( argc < 2 )
{
std::cout << "Usage: " << argv[0] << " <background value>\n";
return EXIT_FAILURE;
}
typedef int PixelType;
const unsigned int Dimension = 2;
typedef itk::Image< PixelType, Dimension > ImageType;
PixelType background = static_cast< PixelType >( atoi( argv[ 1 ] ) );
// Create an image with an arbitrary background value and a number
// of islands with pixel values above and below the background value
ImageType::Pointer image = ImageType::New();
ImageType::SizeType size;
size.Fill( 512 );
image->SetRegions( size );
image->Allocate();
image->FillBuffer( 0 );
// Set up islands
ImageType::IndexType index1;
index1[0] = 10;
index1[1] = 11;
image->SetPixel( index1, 1 );
ImageType::IndexType index2;
index2[0] = 100;
index2[1] = 101;
image->SetPixel( index2, 2 );
// Instantiate and run the filter
typedef itk::ConnectedComponentImageFilter< ImageType, ImageType > FilterType;
FilterType::Pointer filter = FilterType::New();
filter->SetBackgroundValue( background );
filter->SetInput( image );
itk::SimpleFilterWatcher watcher( filter );
try
{
filter->Update();
}
catch( itk::ExceptionObject & excep )
{
std::cerr << "exception caught:" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
if ( filter->GetObjectCount() != 2 )
{
std::cerr << "Expected two objects, got " << filter->GetObjectCount()
<< " instead.\n";
}
// Check results
ImageType * output = filter->GetOutput();
typedef itk::ImageRegionConstIteratorWithIndex< ImageType > IteratorType;
IteratorType iterator( output, output->GetLargestPossibleRegion() );
while ( !iterator.IsAtEnd() )
{
PixelType value = iterator.Get();
ImageType::IndexType index = iterator.GetIndex();
if ( index == index1 || index == index2 )
{
// Check that objects don't have the background value
if ( value == background )
{
std::cerr << "Pixel at index " << index << " has background value "
<< "but have an object label instead.\n";
return EXIT_FAILURE;
}
}
else
{
if ( value != background )
{
std::cerr << "Pixel at index " << index << " has value " << value
<< " but should have value " << background << "\n";
return EXIT_FAILURE;
}
}
++iterator;
}
return EXIT_SUCCESS;
}
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