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I had a similar problem, windows 7, MinGW 4.7.2 (the newest version).Except I could not run any opencv version. Such that after I compiled my code the program just crashes right after execution. Continually receiving errors from libstdc++ and opencv core module.

I downloaded the libstdc++ from (which I happen to stumble upon). I replaced my current libstdc++ with the downloaded one, this resolved the crashes and opencv seems to be working now.

It seems there is some problem with MinGW 4.7.x libstdc++ and windows 7. As this is not the first post of opencv/mingw/windows7 that appeared recently on the net. Hope this helps