typename InputImageType::RegionType inputRegion = input->GetLargestPossibleRegion();
typename InputImageType::SizeType inputSize = inputRegion.GetSize();
typename InputImageType::IndexType start = inputRegion.GetIndex();
typename InputImageType::RegionType inputRegion = input->GetLargestPossibleRegion();
typename InputImageType::SizeType inputSize = inputRegion.GetSize();
typename InputImageType::IndexType start = inputRegion.GetIndex();