command << "clitkZeroVF -i " << temp_dir << "/deformation_" << computed_vf << ".vf -o " << temp_dir <<
"/deformation_" << refimage << ".vf";
DD(command.str()); //create zero VF for the ref image
command << "clitkZeroVF -i " << temp_dir << "/deformation_" << computed_vf << ".vf -o " << temp_dir <<
"/deformation_" << refimage << ".vf";
DD(command.str()); //create zero VF for the ref image