message: Fix wrong mat access.
diff: @@ -73,7 +73,7 @@ double getOrientation(const vector<Point> &pts, Mat &img)
  eigen_vecs[i] = Point2d(pca_analysis.eigenvectors.at<double>(i, 0),
  pca_analysis.eigenvectors.at<double>(i, 1));
  - eigen_val[i] = pca_analysis.eigenvalues.at<double>(0, i);
  + eigen_val[i] = pca_analysis.eigenvalues.at<double>(i);
  }
  //! [pca]
  