vvImageReader::Pointer reader = vvImageReader::New();
std::vector<std::string> filenames;
filenames.push_back(filename[i].toStdString());
reader->SetInputFilenames(filenames);
reader->Update(vvImageReader::IMAGE);
vvImageReader::Pointer reader = vvImageReader::New();
std::vector<std::string> filenames;
filenames.push_back(filename[i].toStdString());
reader->SetInputFilenames(filenames);
reader->Update(vvImageReader::IMAGE);