void Eigenfaces::getFaceCoordinates(vpColVector & coordinates, int subject, int image, int k) const { vpMatrix face; loadImage(face, subject, image); if (k == 0) k = _nSubjects * _nImages; if (k > _nSubjects * _nImages) k = _nSubjects * _nImages; vpColVector rface = (face - _meanFace).stackRows().t(); for (int i = 0; i < k; i++) coordinates.stack(_eigenfaces.getCol(i).t() * rface); }