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opencv solve linear equation system too slow

asked 2014-05-26 22:52:38 -0500

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I used solve function to solve Ax=b problem. The A is large (about 40000*7000). But it is very slow. Even slower than matlab. By the way, I used the SVD method. Any suggestion?

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answered 2014-05-27 01:53:20 -0500

AFAIK, OpenCV is not designed for solving matrix related operation like: multiplication, eigenvalue decomposition or SVD, etc., so your result is not surprise to me. For your problem, there two kinds of choice: the first choice is using a dedicated library, lapack or Eigen is recommended, the second one is using a wrapped library, such as Armadillo or CVMlib. I have tested all of them, or you can see more at this, and my choice is lapack, which gives the fastest speed (on Windows, with VS IDE). Hope this help.

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Asked: 2014-05-26 22:52:38 -0500

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Last updated: May 27 '14