Error “ImportError: DLL load failed: %1 is not a valid Win32 application”

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The ImportError message is a bit misleading because of the reference to Win32, whereas the problem was simply the OpenCV DLLs were not found.

This problem was solved by adding the path the OpenCV binaries to the Windows PATH environment variable (as an example, on my computer this path is: C:\opencv\build\bin\Release).

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