Using Eigen Library with OpenCV 2.3.1

Question

I have trouble in using Eigen3 Library along with OpenCV application in C++. I have installed Eigen3 library on my Ubuntu

Answer 1

I just had to include

#include <Eigen/Dense>

before including OpenCV headers thats all. I compiled them by including the Eigen lib headers and OpenCV lib headers.

Answer 2

First i would double check that the eigen include directions are found. You can use a CMakeList.txt to do so (and you should use the cmake functions to find headers and link to libraries instead of compiler flags)

Next you could try to remove the using namespaces

    using namespace cv;
    using namespace std;
    using namespace Eigen;