//This function removes all objects that are <= minObjSize from the foreground.
//The foreground remains grayscale after this filter
void Preprocess::RemoveConnectedComponents(int minObjSize)
{
typedef itk::Image< unsigned short, 3 > ShortImageType;
typedef itk::ConnectedComponentImageFilter< ImageType3D, ShortImageType > CCFilterType;
typedef itk::RelabelComponentImageFilter< ShortImageType, ShortImageType > RelabelType;
CCFilterType::Pointer ccfilter = CCFilterType::New();
RelabelType::Pointer relabel = RelabelType::New();
ccfilter->SetInput( myImg );
ccfilter->FullyConnectedOn();
relabel->SetInput( ccfilter->GetOutput() );
relabel->SetMinimumObjectSize( minObjSize );
relabel->InPlaceOn();
try
{
relabel->Update();
}
catch( itk::ExceptionObject & excep )
{
std::cerr << "Relabel: exception caught !" << std::endl;
std::cerr << excep << std::endl;
return;
}
unsigned short initNumObjects = ccfilter->GetObjectCount();
unsigned short finalNumObjects = relabel->GetNumberOfObjects();
unsigned short removedNumObjects = initNumObjects - finalNumObjects;
std::cout << "Removed " << removedNumObjects << " of " << initNumObjects << " objects...";
ShortImageType::Pointer ccImage = relabel->GetOutput();
//Use connected component image as a mask:
itk::ImageRegionIterator< ShortImageType > itr1( ccImage, ccImage->GetLargestPossibleRegion() );
itk::ImageRegionIterator< ImageType3D > itr2( myImg, myImg->GetLargestPossibleRegion() );
for(itr1.GoToBegin(), itr2.GoToBegin() ; !itr1.IsAtEnd(); ++itr1, ++itr2)
{
if(itr1.Get() == 0)
{
itr2.Set( 0 );
}
}
}
//This function removes all objects that are <= minObjSize from the foreground.
//The foreground remains grayscale after this filter
bool VolumeProcess::MaskSmallConnComp(int minObjSize)
{
typedef itk::Image< unsigned short, Dimension > ShortImageType;
typedef itk::ConnectedComponentImageFilter< ImageType, ShortImageType > CCFilterType;
typedef itk::RelabelComponentImageFilter< ShortImageType, ShortImageType > RelabelType;
CCFilterType::Pointer ccfilter = CCFilterType::New();
RelabelType::Pointer relabel = RelabelType::New();
ccfilter->SetInput (m_outputImage);
ccfilter->FullyConnectedOn();
relabel->SetInput( ccfilter->GetOutput() );
relabel->SetMinimumObjectSize( minObjSize );
relabel->InPlaceOn();
try
{
relabel->Update();
}
catch( itk::ExceptionObject & excep )
{
std::cerr << "Relabel: exception caught !" << std::endl;
std::cerr << excep << std::endl;
return false;
}
unsigned short numObjects = relabel->GetNumberOfObjects();
if(debug)
std::cerr << "Connected components = " << numObjects << std::endl;
ShortImageType::Pointer ccImage = relabel->GetOutput();
//Use connected component image as a mask:
itk::ImageRegionIterator< ShortImageType > itr1( ccImage, ccImage->GetLargestPossibleRegion() );
itk::ImageRegionIterator< ImageType > itr2( m_outputImage, m_outputImage->GetLargestPossibleRegion() );
for(itr1.GoToBegin(), itr2.GoToBegin() ; !itr1.IsAtEnd(); ++itr1, ++itr2)
{
if(itr1.Get() == 0)
{
itr2.Set( 0 );
}
}
return true;
}
