Eigen not found: what are the implications

1

Hi!
I am building OpenCV for Windows (v4.5.3) and I would like to know what are the consequences of not having Eigen. Are these modules the only one that depend on it? (see log below)

Are there anything else that can benefit from this library?
Looking at the code, I see that it’s also used in the imgproc, calib3d, stitching and core modules.

Thanks!

-- Module opencv_alphamat disabled because the following dependencies are not found: Eigen
-- Module opencv_sfm disabled because the following dependencies are not found: Eigen
-- rgbd: Eigen support is disabled. Eigen is Required for Posegraph optimization
2

For the GitHub - opencv/opencv: Open Source Computer Vision Library library, Eigen is optional.
It is an alternative of LAPACK and can, I think, provide faster results or maybe more accurate results in some particular situations.

If you are curious, search for HAVE_EIGEN: Search · HAVE_EIGEN · GitHub For instance some results: