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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.
OpenCV: open source computer vision library Homepage: http://opencv.org Online docs: http://docs.opencv.org Q&A forum: http://answers.opencv.org Dev zone: http://code.opencv.org
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