c++ opencv3.4 保存和读取PCA模型

 cv::PCA pca(samples, cv::Mat(), cv::PCA::DATA_AS_ROW,100);
 FileStorage fs("pca.xml",FileStorage::WRITE);
 pca.write(fs);
 fs.release();

  FileStorage fs("pca.xml",FileStorage::READ); 
  cv::PCA pca;
  pca.read(fs.root());
  fs.release();