Itseez/opencv — pull request #413 by berak (2013-02-01 20:16:07+00:00)
Title: class LevMarqSparse missing in the win/vs built binaries, missing  CV_EXPORTS

class LevMarqSparse is not tagged CV_EXPORTS,
so the contrib module, built the on win using vs won't contain that symbol,
trying to create an instance of LevMarqSparse will lead to a 'undefined symbol' err, because it did not make it into the library.