typename ConnectFilterType::Pointer connectFilter = ConnectFilterType::New();
connectFilter->SetInput(input);
connectFilter->SetBackgroundValue(BG);
connectFilter->SetFullyConnected(isFullyConnected);
// Sort by size and remove too small area.
typename ConnectFilterType::Pointer connectFilter = ConnectFilterType::New();
connectFilter->SetInput(input);
connectFilter->SetBackgroundValue(BG);
connectFilter->SetFullyConnected(isFullyConnected);
// Sort by size and remove too small area.