Reputation: 6828
I have an continous OpenCV (assymmetric) matrix cv::Mat m
and I want to compute its eigenvector and eigenvalues through Eigen::EigenSolver
.
Since m
could be big, making a copy through cv2eigen
function is inefficient. Then, I want to use the Eigen::Map
. This is my code:
Eigen::Map<Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>> mMapped (m.ptr<float>(), m.rows, m.cols);
Eigen::EigenSolver<Eigen::Map<Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>>> solver(mMapped,true);//this gives a bunch of errors
The last line gives a bunch of errors (see the end of the question). How can I solve this? Notice that I should avoid to copy mMapped
to a matrix object, otherwise it's equivalent to use cv2eigen
(I think).
/usr/local/include/eigen3/Eigen/src/Eigenvalues/EigenSolver.h: In instantiation of ‘class Eigen::EigenSolver<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’:
../Math.hpp:64:104: required from ‘static void Math::createHashTable(const cv::Mat&, cv::Mat&, cv::Mat&, int, int) [with T = float]’
../CloudCache.cpp:155:58: required from here
/usr/local/include/eigen3/Eigen/src/Eigenvalues/EigenSolver.h:71:10: error: ‘Options’ is not a member of ‘Eigen::EigenSolver<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >::MatrixType {aka Eigen::Map<Eigen::Matrix<float, -1, -1, 1> >}’
enum {
^
In file included from /usr/local/include/eigen3/Eigen/Eigenvalues:29:0,
from ../Math.hpp:16,
from ../CloudCache.cpp:15:
/usr/local/include/eigen3/Eigen/src/Eigenvalues/RealSchur.h: In instantiation of ‘class Eigen::RealSchur<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’:
/usr/local/include/eigen3/Eigen/src/Eigenvalues/EigenSolver.h:312:27: required from ‘class Eigen::EigenSolver<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’
../Math.hpp:64:104: required from ‘static void Math::createHashTable(const cv::Mat&, cv::Mat&, cv::Mat&, int, int) [with T = float]’
../CloudCache.cpp:155:58: required from here
/usr/local/include/eigen3/Eigen/src/Eigenvalues/RealSchur.h:58:10: error: ‘Options’ is not a member of ‘Eigen::RealSchur<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >::MatrixType {aka Eigen::Map<Eigen::Matrix<float, -1, -1, 1> >}’
enum {
^
In file included from /usr/local/include/eigen3/Eigen/src/Eigenvalues/RealSchur.h:14:0,
from /usr/local/include/eigen3/Eigen/Eigenvalues:29,
from ../Math.hpp:16,
from ../CloudCache.cpp:15:
/usr/local/include/eigen3/Eigen/src/Eigenvalues/HessenbergDecomposition.h: In instantiation of ‘class Eigen::HessenbergDecomposition<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’:
/usr/local/include/eigen3/Eigen/src/Eigenvalues/RealSchur.h:228:41: required from ‘class Eigen::RealSchur<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’
/usr/local/include/eigen3/Eigen/src/Eigenvalues/EigenSolver.h:312:27: required from ‘class Eigen::EigenSolver<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >’
../Math.hpp:64:104: required from ‘static void Math::createHashTable(const cv::Mat&, cv::Mat&, cv::Mat&, int, int) [with T = float]’
../CloudCache.cpp:155:58: required from here
/usr/local/include/eigen3/Eigen/src/Eigenvalues/HessenbergDecomposition.h:64:10: error: ‘Options’ is not a member of ‘Eigen::HessenbergDecomposition<Eigen::Map<Eigen::Matrix<float, -1, -1, 1> > >::MatrixType {aka Eigen::Map<Eigen::Matrix<float, -1, -1, 1> >}’
enum {
^
subdir.mk:30: recipe for target 'CloudCache.o' failed
make: *** [CloudCache.o] Error 1
Upvotes: 3
Views: 315
Reputation: 29205
You cannot declare an EigenSolver
with a Map
, the matrix type must be a Matrix
, so in your case:
typedef Matrix<float,Dynamic,Dynamic,RowMajor> RowMatrixXf;
Map<RowMatrixXf> mMapped (m.ptr<float>(), m.rows, m.cols);
EigenSolver<MatrixXf> eig(mMapped);
You can also instantiate EigenSolver
with RowMatrixXf
but the performance should be lower, despite of the transposition.
Upvotes: 2